Discovery of a Second Transient Low-Mass X-ray Binary in the Globular Cluster NGC 6440 (2009)
Heinke, C. O., Altamirano, D., Cohn, H. N., Lugger, P. M., Budac, S. A., Servillat, M., ...
We have identified a new transient luminous low-mass X-ray binary, NGC 6440 X-2, with Chandra/ACIS, RXTE/PCA, and Swift/XRT observations of the globular cluster NGC 6440. The discovery outburst (July...
GRB 090423 at a redshift of z ≈ 8.1 (2009)
Salvaterra, Ruben, Della Valle, M., Campana, S., Chincarini, G., Covino, S., D'Avanzo, P., ...
3 pages, 2 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0906.1578
What ignites on the neutron star of 4U 0614+091? (2009)
Kuulkers, E., Zand, J. J. M. In 't, Atteia, J. -L., Levine, A. M., Brandt, S., Smith, D. A., ...
[abridged] The LMXB 4U 0614+091 is a source of sporadic thermonuclear (type I) X-ray bursts. We find bursts with a wide variety of characteristics in serendipitous wide-field X-ray observations by...
Swift Observations of Hard X-ray Emitting White Dwarfs in Symbiotic Stars (2009)
Kennea, J. A., Mukai, K., Sokoloski, J. L., Luna, G. J. M., Tueller, J., Markwardt, C. B., ...
The X-ray emission from most accreting white dwarfs (WDs) in symbiotic binary stars is quite soft. Several symbiotic WDs, however, produce strong X-ray emission at energies greater than ~20 keV. The...
Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts (2009)
Ukwatta, T. N., Dhuga, K. S., Parke, W. C., Sakamoto, T., Markwardt, C. B., Barthelmy, S. D., ...
We present the results of our study of the variability time scales of a sample of 27 long Swift Gamma-Ray Bursts (GRBs) with known redshifts. The variability time scale can help our understanding of...
GRB 090423 at a redshift of z~8.1 (2009)
Salvaterra, R., Della Valle, M., Campana, S., Chincarini, G., Covino, S., D'Avanzo, P., ...
Gamma-ray bursts (GRBSs) are produced by rare types of massive stellar explosions. Their rapidly fading afterglows are often bright enough at optical wavelengths, that they are detectable up to...
Zand, J. J. M. In 't, Jonker, P. G., Bassa, C. G., Markwardt, C. B., Levine, A. M.
An X-ray monitoring campaign with Chandra and Swift confirms that 1RXS J171824.2-402934 is accreting at the lowest rate among the known persistently accreting low-mass X-ray binaries. A thermonuclear...
The 22-Month Swift-BAT All-Sky Hard X-ray Survey (2009)
Tueller, J., Baumgartner, W. H., Markwardt, C. B., Skinner, G. K., Mushotzky, R. F., Ajello, M., ...
We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14--195 keV) conducted with the BAT coded mask imager on the \swift satellite. The catalog...
Hartman, J. M., Patruno, A., Chakrabarty, D., Markwardt, C. B., Morgan, E. H., Van Der Klis, M., ...
The Rossi X-ray Timing Explorer has observed five outbursts from the transient 2.5 ms accretion-powered pulsar SAX J1808.4-3658 during 1998-2008. We present a pulse timing study of the most recent...
Epeak estimator for Gamma-Ray Bursts Observed by the Swift Burst Alert Telescope (2008)
Sakamoto, T., Sato, G., Barbier, L., Barthelmy, S. D., Cummings, J. R., Fenimore, E. E., ...
We report a correlation based on a spectral simulation study of the prompt emission spectra of gamma-ray bursts (GRBs) detected by the Swift Burst Alert Telescope (BAT). The correlation is between...
Cosmic X-ray background and Earth albedo Spectra with Swift/BAT (2008)
Ajello, M., Greiner, J., Sato, G., Willis, D. R., Kanbach, G., Strong, A. W., ...
We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV...
Suzaku Observations of Four Heavily Absorbed HMXBs (2008)
Morris, D. C., Smith, R. K., Markwardt, C. B., Mushotzky, R. F., Tueller, J., Kallman, T. R., ...
We report on Suzaku observations of four unidentified sources from the INTEGRAL and Swift BAT Galactic plane surveys. All the sources have a large neutral hydrogen column density and are likely...
GRB 070610: a curious galactic transient (2008)
Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., ...
GRB 070610 is a typical high-energy event with a duration of 5 s. Yet within the burst localization we detect a highly unusual X-ray and optical transient, Swift J195509.6+261406. We see...
An X-ray and optical study of the ultracompact X-ray binary A1246-58 (2008)
Zand, J. J. M. In 't, Bassa, C. G., Jonker, P. G., Keek, L., Verbunt, F., Mendez, M., ...
Results are discussed of an X-ray and optical observation campaign of the low-mass X-ray binary A1246-58 performed with instruments on Satellite per Astronomia X ('BeppoSAX'), the Rossi X-ray Timing...
Meléndez, M., Kraemer, S. B., Armentrout, B. K, Deo, R. P., Crenshaw, D. M., Schmitt, H. R., ...
We have studied the relationship between the [O IV] lambda 25.89 micron emission line luminosities, obtained from Spitzer spectra, the X-ray continua in the 2-10 keV band, primarily from ASCA, and...
Global Properties of X-Ray Flashes and X-Ray-Rich Gamma-Ray Bursts Observed by Swift (2008)
Sakamoto, T., Hullinger, D., Sato, G., Yamazaki, R., Barbier, L., Barthelmy, S. D., ...
We describe and discuss the spectral and temporal characteristics of the prompt emission and X-ray afterglow emission of X-ray flashes (XRFs) and X-ray-rich gamma-ray bursts (XRRs) detected and...
The Swift BAT X-Ray survey. III. X-Ray spectra and statistical properties (2008)
Ajello, M., Rau, A., Greiner, J., Kanbach, G., Salvato, M., Strong, A. W., ...
In this concluding part of the series of three papers dedicated to the Swift BAT hard X-ray survey (BXS), we focus on the X-ray spectral analysis and statistical properties of the source sample....
The Swift BAT X-ray survey - III. X-ray spectra and statistical properties (2008)
Ajello, M., Rau, A., Greiner, J., Kanbach, G., Salvato, M., Strong, A. W., ...
GRB 070610: a curious galactic transient (2008)
Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., ...
Cosmic X-ray background and earth Albedo spectra with Swift BAT (2008)
Ajello, M., Greiner, J., Sato, G., Willis, D. R., Kanbach, G., Strong, A. W., ...
An X-ray and optical study of the ultracompact X-ray binary A 1246-58 (2008)
Zand, J.J.M. In 't, Bassa, C.G., Jonker, P.G., Keek, L., Verbunt, F.W.M., Méndez, M., ...
Results are discussed of an X-ray and optical observation campaign of the low-mass X-ray binary A 1246-58 performed with instruments on Satellite per Astronomia X ("BeppoSAX"), the Rossi X-ray Timing...
Hartman, J.M., Patruno, A., Chakrabarty, D., Kaplan, D.L., Markwardt, C.B., Morgan, E.H., ...
We present a 7 yr timing study of the 2.5 ms X-ray pulsar SAX J1808.4-3658, an X-ray transient with a recurrence time of approximate to 2 yr, using data from the Rossi X-Ray Timing Explorer covering...
RXTE confirms persistent activity of burster IGR J17473-2721 (2008)
Markwardt, C.B., Altamirano, D., Swank, J.H., Zand, J. In 't
Following reports of bursting activity of IGR J17473-2721 (= XTE J1747-274) by the AGILE team (Del Monte et al., ATEL #1445) and from Swift (Altamirano et al., ATEL #1459), we note that RXTE PCA...
Timing and spectral properties of the accreting millisecond pulsar SWIFT J1756.9-2508 (2008)
Linares, M., Wijnands, R., Klis, M. Van Der, Krimm, H., Markwardt, C.B., Chakrabarty, D.
SWIFT J1756.9–2508 is one of the few accreting millisecond pulsars (AMPs) discovered to date. We report here the results of our analysis of its aperiodic X-ray variability, as measured with the...
Pulse timing of the ongoing outburst of SAX J1808.4-3658 with RXTE (2008)
Patruno, A., Hartman, J.M., Wijnands, R., Klis, M. Van Der, Chakrabarty, D., Morgan, E.H., ...
Since the start of its current X-ray outburst on 2008 Sep 21 (ATel #1728), the accretion-powered millisecond pulsar SAX J1808.4-3658 has been observed for roughly 10 ks per day with the RXTE PCA....
New and old outbursts of IGR J17379-3747 ( = XTE J1737-376) (2008)
Markwardt, C.B., Krimm, H., Wijnands, R., Swank, J.H.
In Feb-March 2004, scans of the galactic bulge region by RXTE PCA detected a new excess. At the time, position scans were done, with the resulting best fit position of RA, Dec = 264.4606, -37.6605...
Clarification of orbital elements for SAX J1808.4-3658 (2008)
Patruno, A., Hartman, J.M., Wijnands, R., Klis, M. Van Der, Chakrabarty, D., Morgan, E.H., ...
In Atel#1760 we posted an incorrect definition of the ascending node as "the point at 90 degrees mean longitude". The correct definition of the ascending node is "the point at 0 degrees true...
Unusual optical and X-ray flaring activity in GX 339-4 (2008)
Russell, D.M., Altamirano, D., Lewis, F., Roche, P., Markwardt, C.B., Fender, R.P.
Since September 2007 we have been monitoring the optical counterpart (V, R and i-bands) of the black hole X-ray binary GX 339-4 with the Faulkes Telescope South situated at Siding Spring in...
Improved position of the new X-ray transient XTE J1637-498 (2008)
Wijnands, R., Linares, M., Degenaar, N., Markwardt, C.B.
Following the discovery of the new X-ray transient XTE J1637-498 (Atel #1699), we obtained a short (nearly 1 ksec) observation using the Swift/XRT in PC mode on 2008-09-04 at 18:15 UT. We detected...
Swift BAT Survey of AGN (2007)
Tueller, J., Mushotzky, R. F., Barthelmy, S., Cannizzo, J. K., Gehrels, N., Markwardt, C. B., ...
We present the results of the analysis of the first 9 months of data of the Swift BAT survey of AGN in the 14-195 keV band. Using archival X-ray data or follow-up Swift XRT observations, we have...
Swift captures the spectrally evolving prompt emission of GRB 070616 (2007)
Starling, R. L. C., O'Brien, P. T., Willingale, R., Page, K. L., Osborne, J. P., De Pasquale, M., ...
The origins of Gamma-ray Burst prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the case of GRB 070616,...
Heated Polar Caps in PSRs 0656+14 and 1055-52 (2007)
C. Greiveldinger, U. Camerini, W. Fry, C. B. Markwardt, H. Ögelman, S. Safi-Harb, ...
We present new ASCA observations covering the 0.5 to 10 keV X-ray range of the cooling neutron star candidates PSR 0656+14 and PSR 1055--52. Previous ROSAT observations had shown that two component...
Corbet, R. H. D., Sokoloski, J. L., Mukai, K., Markwardt, C. B., Tueller, J.
We present an analysis of the X-ray variability of three symbiotic X-ray binaries, GX 1+4, 4U 1700+24, and 4U 1954+31, using observations made with the Swift Burst Alert Telescope (BAT) and the Rossi...
BAT X-ray Survey - III: X-ray Spectra and Statistical Properties (2007)
Ajello, M., Rau, A., Greiner, J., Kanbach, G., Salvato, M., Strong, A. W., ...
In this concluding part of the series of three papers dedicated to the Swift/BAT hard X-ray survey (BXS), we focus on the X-ray spectral analysis and statistical properties of the source sample....
Krimm, H. A., Markwardt, C. B., Deloye, C. J., Romano, P., Chakrabarty, D., Campana, S., ...
We report on the discovery by the Swift Gamma-Ray Burst Explorer of the eighth known transient accretion-powered millisecond pulsar, SWIFT J1756.9-2508, as part of routine observations with the Swift...
GRB070610 : A Curious Galactic Transient (2007)
Kasliwal, M. M., Cenko, S. B., Kulkarni, S. R., Cameron, P. B., Nakar, E., Ofek, E. O., ...
GRB 070610 is a typical high-energy event with a duration of 5s.Yet within the burst localization we detect a highly unusual X-ray and optical transient, SwiftJ195509.6+261406. We see high amplitude...
The First Swift BAT Gamma-Ray Burst Catalog (2007)
Sakamoto, T., Barthelmy, S. D., Barbier, L., Cummings, J. R., Fenimore, E. E., Gehrels, N., ...
We present the first Swift Burst Alert Telescope (BAT) catalog of gamma-ray bursts (GRBs), which contains bursts detected by the BAT between 2004 December 19 and 2007 June 16. This catalog (hereafter...
Swift observations of high-redshift radio-loud quasars (2007)
Sambruna, R. M., Tavecchio, F., Ghisellini, G., Donato, D., Holland, S. T., Markwardt, C. B., ...
We report on Swift observations of four z>2 radio-loud quasars (0212+735, 0537-286, 0836+710, and 2149-307), classified as blazars. The sources, well-known emitters at soft-medium X-rays, were...
X-Raying the MOJAVE Sample of Compact Extragalactic Radio Jets (2007)
Kadler, M., Sato, G., Tueller, J., Sambruna, R. M., Markwardt, C. B., Giommi, P., ...
The MOJAVE sample is the first large radio-selected, VLBI-monitored AGN sample for which complete X-ray spectral information is being gathered. We report on the status of Swift survey observations...
Six new candidate ultracompact X-ray binaries (2007)
Zand, J. J. M. In 't, Jonker, P. G., Markwardt, C. B.
Ultracompact X-ray binaries (UCXBs) appear able to sustain accretion onto the compact accretor at rates lower than in wider X-ray binaries. This may be understood by the smaller accretion disks in...
The INTEGRAL Galactic bulge monitoring program: the first 1.5 years (2007)
Kuulkers, E., Shaw, S. E., Paizis, A., Chenevez, J., Brandt, S., Courvoisier, T. J. -L., ...
The Galactic bulge region is a rich host of variable high-energy point sources. Since 2005, February 17 we are monitoring the source activity in this region about every three days with INTEGRAL....
GRB 070126: Swift detection of a possible burst (2007)
Vetere, L., Chester, M.M., Cummings, J.R., Holland, S.T., Immler, S., Markwardt, C.B., ...
Not Available
GRB 070110: Swift detection of a burst with a possible optical afterglow (2007)
Krimm, H.A., Barthelmy, S.D., Chester, M.M., Cusumano, G., Evans, P.A., Gehrels, N., ...
Not Available
Swift follow-up observations of the fast-transient IGR J17191-2821 (2007)
Klein Wolt, M., Wijnands, R., Markwardt, C.B., Swank, J.H.
Not Available
GRB 070129: Swift detection of a burst (2007)
Godet, O., Burrows, D.N., Chester, M.M., Holland, S.T., Kennea, J.A., Markwardt, C.B., ...
Not Available
GRB 070328: Swift/XRT refined analysis (2007)
Evans, P.A., Beardmore, A.P., Goad, M.R., Page, K.L., Starling, R.L.C., Tyler, L.G., ...
Not Available
RXTE/PCA observations reveal fast-transient nature of IGR J17191-2821 (2007)
Swank, J.H., Markwardt, C.B., Klein Wolt, M.
On March 3 at 14:31 UTC, the RXTE/PCA had a scan of the Galactic bulge which detected a new source, at a position which is consistent with it being IGR J17191-2821, at an intensity of 10+-1 mCrab...
RXTE and Swift Discovery of the Intermittent Source XTE J1704-445 (2007)
Markwardt, C.B., Swank, J.H., Klein Wolt, M., Smith, D.M.
We report the detection of an intermittent source XTE J1704-445 (hereafter J1704). This source was first detected in RXTE PCA scans of the galactic bulge and ridge regions over approximately a month....
The INTEGRAL Galactic bulge monitoring program: the first 1.5 years (2007)
Kuulkers, E., Shaw, S.E., Paizis, A., Chenevez, J., Brandt, S., Courvoisier, T.J.L., ...
Aims.The Galactic bulge region is a rich host of variable high-energy point sources. Since 2005, February 17 we are monitoring the source activity in the Galactic bulge region regularly and...
kHz QPOs during the decay of the outburst of IGR J17191-2821 (2007)
Klein Wolt, M., Wijnands, R., Swank, J.H., Markwardt, C.B.
We continued to monitor the outburst of the transient IGR J17191-2821 (ATels #1021,#1022,#1025,#1065,#1068,#1069,#1070) with RXTE/PCA and Swift/XRT observations. After our last Swift/XRT observation...
Swift follow-up observations of the fast-transient IGR J17191-2821 (2007)
Klein Wolt, M., Wijnands, R.A.D., Markwardt, C.B., Swank, J.H.
Not Available
Burst Oscillations from IGR J17191-2821 Imply a 294 Hz Spin Frequency (2007)
Markwardt, C.B., Klein Wolt, M., Swank, J.H., Wijnands, R.
The X-ray transient IGR J17191-2821 was detected by INTEGRAL (ATEL #1021) and shown to have a rapid variability and decay (ATEL #1022, ATEL #1025). A more recent report of activity by RXTE and Swift...
Correction: IGR J17191-2821 Peak Flux (2007)
Markwardt, C.B., Klein Wolt, M., Swank, J.H., Wijnands, R.
In ATEL #1068, we reported an erroneous peak flux during an X-ray burst from IGR J17191-2821. The correct peak flux was 2.3E-8 erg/s/ cm^2 (unabsorbed bolometric). The originally reported distance...
IGR J18175-1530 = XTE J1817-155 Detected in September 2007 (2007)
Markwardt, C.B., Klein Wolt, M., Swank, J.H., Wijnands, R.
Regarding the recent report on IGR J18175-1530 (Paizis et al., ATEL #1248), this source was also detected RXTE PCA scans of the region. At the time of the detection in September 2007, the source was...
A bright outburst of IGR J17191-2821 and detection of a type-I X- ray burst (2007)
Klein Wolt, M., Wijnands, R., Swank, J.H., Markwardt, C.B.
The transient IGR J17191-2821 (Atels #1021,#1022,#1025) has reached a state of increase activity demonstrating a bright outburst. During RXTE/PCA bulge scan observations taken on April 29 (14:39:50...
An improvement of the position of IGR J17191-2821 (2007)
Klein Wolt, M., Maitra, D., Wijnands, R., Swank, J.H., Markwardt, C.B., Bailyn, C.D.
We observed the transient IGR J17191-2821 (Atels #1021,#1022,#1025,#1065,#1068,#1069) again for 1.8 ksec on May 07 (18:30 UTC) with Swift/XRT in the imaging mode (Photon-Counting mode). The source is...
GRB 070126: Swift detection of a possible burst (2007)
Vetere, L., Chester, M.M., Cummings, J.R., Holland, S.T., Immler, S., Markwardt, C.B., ...
Not Available
GRB 070110: Swift detection of a burst with a possible optical afterglow (2007)
Krimm, H.A., Barthelmy, S.D., Chester, M.M., Cusumano, G., Evans, P.A., Gehrels, N., ...
Not Available
GRB 070129: Swift detection of a burst (2007)
Godet, O., Burrows, D.N., Chester, M.M., Holland, S.T., Kennea, J.A., Markwardt, C.B., ...
Not Available
GRB 070328: Swift/XRT refined analysis (2007)
Evans, P.A., Beardmore, A.P., Goad, M.R., Page, K.L., Starling, R.L.C., Tyler, L.G., ...
Not Available
Gehrels, N., Norris, J. P., Mangano, V., Barthelmy, S. D., Burrows, D. N., Granot, J., ...
Gamma ray bursts (GRBs) are known to come in two duration classes, separated at ~2 s. Long bursts originate from star forming regions in galaxies, have accompanying supernovae (SNe) when near enough...
GRO J1655-40: Early Stages of the 2005 Outburst (2006)
Shaposhnikov, N., Swank, J., Shrader, C. R., Rupen, M., Beckmann, V., Markwardt, C. B., ...
The black-hole X-ray binary transient GRO J1655-40 underwent an outburst beginning in early 2005. We present the results of our multi-wavelength observational campaign to study the early outburst...
Corbet, R. H. D., Markwardt, C. B., Tueller, J.
Observations of the high-mass X-ray binary 4U 2206+54 with the Swift Burst Alert Telescope (BAT) do not show modulation at the previously reported period of 9.6 days found from observations made with...
Optical, Infrared, and Ultraviolet Observations of the X-Ray Flash GRB 050416A (2006)
Holland, S. T., Boyd, P. T., Gorosabel, J., Hjorth, J., Schady, P., Thomsen, B., ...
We present ultraviolet, optical, and infrared photometry of the afterglow of the X-ray flash XRF 050416A taken between approximately 100 seconds and 36 days after the burst. We find an intrinsic...
Swift panchromatic observations of the bright gamma‐ray burst GRB 050525a (2006)
Blustin, A.J., Band, D., Barthelmy, S., Boyd, P., Capalbi, M., Holland, S.T., ...
The bright gamma-ray burst GRB 050525a has been detected with the Swift observatory, providing unique multiwavelength coverage from the very earliest phases of the burst. The X-ray and optical/UV...
A new y-ray burst classification scheme from GRB 060614. (2006)
Gehrels, N., Norris, J.P., Barthelmy, S., Granot, J., Kaneko, Y., Kouveliotou, C., ...
Wijnands, R.A.D., Kuulkers, E., Muno, M.P., Cackett, E.M., Zand, J.J.M. In't, Maccarone, T.J., ...
On 8-9 September 2006, a series of 7 XMM-Newton observations were performed as part of our XMM-Newton/Chandra monitoring campaign of the 1.7 square degree region around Sgr A* (Wijnands et al. 2006,...
INTEGRAL discovery of two faint hard X-ray sources in the Galactic Bulge (2006)
Turler, M., Shaw, S.E., Kuulkers, E., Brandt, S., Courvoisier, T.J.L., Garau, A.D., ...
Analysis of INTEGRAL Galactic Bulge monitoring observations (ATel #438) taken between 16:51 and 20:33 UTC on 3 April 2006, reveals the presence of two new sources of hard X-rays. They both have a...
INTEGRAL detects hard X-ray emission from XTE J1817-330 (2006)
Shaw, S.E., Zurita, J., Kuulkers, E., Brandt, S., Chenevez, J., Courvoisier, T.J.L., ...
During the start of the third period of the INTEGRAL Galactic Bulge monitoring observations (Kuulkers et al 2005, ATel #438), the X-ray transient and black-hole candidate XTE J1817-330 (ATel #714)...
Further INTEGRAL observations of IGR J17497-2821 (2006)
Shaw, S.E., Soldi, S., Mowlavi, N., Kuulkers, E., Brandt, S., Chenevez, J., ...
The new INTEGRAL source IGR J17497-2821 (ATel #885) has been clearly detected by IBIS/ISGRI (S/N=33, 20-60 keV) in the INTEGRAL Galactic bulge monitoring program (ATels #438, #874) on 2006, Sep 18,...
GRB 061021: Swift detection of a burst (2006)
Moretti, A., Barthelmy, S.D., Gehrels, N., Guidorzi, C., Holland, S.T., Kennea, J.A., ...
Not Available
GRB 061201: Swift detection of a short hard burst (2006)
Marshall, F.E., Barthelmy, S.D., Beardmore, A.P., Godet, O., Holland, S.T., Kennea, J.A., ...
Not Available
The INTEGRAL Galactic Bulge monitoring program (2006)
Kuulkers, E., Shaw, S.E., Brandt, S., Chenevez, J., Courvoisier, T.J.L., Ebisawa, K., ...
The Galactic Bulge region is a rich host of variable high-energy point sources. These sources include bright and relatively faint X-ray transients, X-ray bursters, persistent neutron star and...
Kuulkers, E., Shaw, S.E., Paizis, A., Gros, A., Chenevez, J., Sanchez-Fernandez, C., ...
We performed a re-analysis of all consolidated data of the INTEGRAL AO-3 Galactic Bulge monitoring program (ATel #438; Kuulkers et al. 2006, astro-ph/0603130), and detected a new source with...
INTEGRAL and RXTE monitoring of XTE J1817-330: evolving through a state change? (2006)
Kuulkers, E., Goldoni, P., Shaw, S.E., Brandt, S., Chenevez, J., Courvoisier, T.J.L., ...
INTEGRAL Galactic Bulge monitoring observations (ATel #438) indicate that the X-ray transient and black-hole candidate XTE J1817-330 (ATel #714) has increased in hard X-rays (20-60 keV) compared to...
Broadband INTEGRAL analysis of IGR J17497-2821 (2006)
Kuulkers, E., Chenevez, J., Shaw, S.E., Brandt, D., Courvoisier, T.J.L., Garau, A.D., ...
We further analysed the INTEGRAL JEM-X observations performed on UT 2006, Sep 18, 08:30-12:12 (ATel #886) of the new hard INTEGRAL source IGR J17497-2821 (ATel #885). We find average fluxes of 31 +/-...
Precision Timing of an Accreting Millisecond Pulsar Over Seven Years (2006)
Hartman, J.M., Chakrabarty, D., Morgan, E.H., Watts, A.L., Klis, M. Van Der, Wijnands, R.A.D., ...
We present a comprehensive timing study of the 2.5 millisecond X-ray pulsar SAX 1808.4-3658. Using data from the Rossi X-ray Timing Explorer, we construct a phase-connected pulse timing solution for...
Three active neutron star X-ray transients: SAX J1747.0-2853, XTE J1739-285 and GRS 1747-312 (2006)
Chenevez, J., Shaw, S.E., Kuulkers, E., Brandt, S., Courvoisier, T.J.L., Ebisawa, K., ...
Apart from the active black-hole candidate X-ray transient XTE J1817-330 (ATel #714), three known neutron star X-ray transients have been found to be active in the INTEGRAL Galactic Bulge monitoring...
INTEGRAL detects SWIFT J174535.5-290135.6 (2006)
Chenevez, J., Sanchez-Fernandez, C., Kuulkers, E., Shaw, S.E., Brandt, S., Courvoisier, T.J.L., ...
We report on a detection of the new source SWIFT J174535.5-290135.6 (ATel #753) by the JEM-X monitor during INTEGRAL Galactic Bulge monitoring observations taken between 2006, 17 Feb 21:11 and 18 Feb...
GRB 061217: Swift detection of a short hard burst (2006)
Barthelmy, S.D., Burrows, D.N., Chester, M.M., Cummings, J.R., Evans, P.A., Gehrels, N., ...
Not Available
GRB 050911: a black hole - neutron star merger or a naked GRB (2005)
Page, K. L., King, A. R., Levan, A. J., O'Brien, P. T., Osborne, J. P, Barthelmy, S. D., ...
GRB 050911, discovered by the Swift Burst Alert Telescope, was not seen 4.6 hr later by the Swift X-ray Telescope, making it one of the very few X-ray non-detections of a Gamma-Ray Burst (GRB)...
Sakamoto, T., Barbier, L., Barthelmy, S. D., Cummings, J. R., Fenimore, E. E., Gehrels, N., ...
We report Swift Burst Alert Telescope (BAT) observations of the X-ray Flash (XRF) XRF 050416A. The fluence ratio between the 15-25 keV and 25-50 keV energy bands of this event is 1.5, thus making it...
Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array (2005)
Jahoda, K., Markwardt, C. B., Radeva, Y., Rots, A., Stark, M. J., Swank, J. H., ...
We present the calibration and background model for the Proportional Counter Array (PCA) aboard the Rossi X-ray Timing Explorer (RXTE). The energy calibration is systematics limited below 10 keV with...
XTE J1739-302 as a Supergiant Fast X-ray Transient (2005)
Smith, D. M., Heindl, W. A., Markwardt, C. B., Swank, J. H., Negueruela, I., Harrison, T. E., ...
XTE J1739-302 is a transient X-ray source with unusually short outbursts, lasting on the order of hours. Here we give a summary of X-ray observations we have made of this object in outburst with the...
A short gamma-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225 (2005)
Gehrels, N ; JFA; CORA, Sarazin, C L, O'Brien, P T, Zhang, B, Barbier, Lieven; U0005242 ;, Barthelmy, S D, ...
Gamma-ray bursts (GRBs) come in two classes: long (> 2 s), soft-spectrum bursts and short, hard events. Most progress has been made on understanding the long GRBs, which are typically observed at...
The Swift/BAT High Latitude Survey: First Results (2005)
Markwardt, C. B., Tueller, J., Skinner, G. K., Gehrels, N., Barthelmy, S. D., Mushotzky, R. F.
We present preliminary results from the first 3 months of the Swift BAT high galactic latitude survey in the 14--195 keV band. The survey reaches a flux of \~10^{-11} erg/cm^2/s and has ~2.7' (90%...
Wijnands, R., Zand, J. J. M. In 't, Rupen, M., Maccarone, T., Homan, J., Cornelisse, R., ...
We present the first results of our X-ray monitoring campaign on a 1.7 square degree region centered on Sgr A* using the satellites XMM-Newton and Chandra. The purpose of this campaign is to monitor...
The Burst Alert Telescope (BAT) on the Swift MIDEX Mission (2005)
Barthelmy, S. D., Barbier, L. M., Cummings, J. R., Fenimore, E. E., Gehrels, N., Hullinger, D., ...
The Burst Alert Telescope (BAT) is one of 3 instruments on the Swift MIDEX spacecraft to study gamma-ray bursts (GRBs). The BAT first detects the GRB and localizes the burst direction to an accuracy...
The binary period and outburst behaviour of the SMC X-ray binary pulsar system SXP504 (2005)
Edge, W. R. T., Coe, M. J., Galache, J. L., McBride, V. A., Corbet, R. H. D., Okazaki, A. T., ...
A probable binary period has been detected in the optical counterpart to the X-ray source CXOU J005455.6-724510 = RX J0054.9-7245 = AXJ0054.8-7244 = SXP504 in the Small Magellanic Cloud. This source...
An infrared flash contemporaneous with the γ-rays of GRB 041219a (2005)
C. H. Blake, J. S. Bloom, D. L. Starr, E. E. Falco, M. Skrutskie, E. E. Fenimore, ...
Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence (2005)
Jonker, P. G., Campana, S., Steeghs, D., Torres, M. A. P., Galloway, D. K., Markwardt, C. B., ...
In this Paper we report on our analysis of three Chandra observations of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 obtained during the late stages of the 2004 outburst. We also...
X-ray Bursts from the Transient Magnetar Candidate XTE J1810-197 (2005)
Woods, P. M., Kouveliotou, C., Gavriil, F. P., Kaspi, V. M., Roberts, M. S. E., Ibrahim, A., ...
We have discovered four X-ray bursts, recorded with the Rossi X-ray Timing Explorer Proportional Counter Array between 2003 September and 2004 April, that we show to originate from the transient...
A giant γ-ray flare from the magnetar SGR 1806–20 (2005)
D. M. Palmer, S. Barthelmy, N. Gehrels, R. M. Kippen, T. Cayton, C. Kouveliotou, ...
A giant gamma-ray flare from the magnetar SGR 1806-20 (2005)
Palmer, D M ; JFA; CORA, Barthelmy, S, Gehrels, N, Kippen, R M, Cayton, T, Kouveliotou, C, ...
Two classes of rotating neutron stars-soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars-are magnetars, whose X-ray emission is powered by a very strong magnetic field (B approximately...
A contemporaneous infrared flash from a long gamma-ray burst: an echo from the central engine (2005)
Blake, C. H., Bloom, J. S., Starr, D. L., Falco, E. E., Skrutskie, M., Fenimore, E. E., ...
The explosion that results in a cosmic gamma-ray burst (GRB) is thought to produce emission from two physical processes -- the activity of the central engine gives rise to the high-energy emission of...
A Link between Prompt Optical and Prompt Gamma-Ray Emission in Gamma-Ray Bursts (2005)
Vestrand, W. T., Wozniak, P. R., Wren, J. A., Fenimore, E. E., Sakamoto, T., White, R. R., ...
The prompt optical emission that arrives with gamma-rays from a cosmic gamma-ray burst (GRB) is a signature of the engine powering the burst, the properties of the ultra-relativistic ejecta of the...
A powerful bursting radio source towards the Galactic Centre (2005)
Hyman, S. D., Lazio, T. J. W., Kassim, N. E., Ray, P. S., Markwardt, C. B., Yusef-Zadeh, F.
Transient astronomical sources are typically powered by compact objects and usually signify highly explosive or dynamic events. While radio astronomy has an impressive record of obtaining high time...
Gamma-Ray Observations of a Giant Flare from The Magnetar SGR 1806-20 (2005)
Palmer, D. M., Barthelmy, S., Gehrels, N., Kippen, R. M., Cayton, T., Kouveliotou, C., ...
Magnetars comprise two classes of rotating neutron stars (Soft Gamma Repeaters (SGRs) and Anomalous X-ray Pulsars), whose X-ray emission is powered by an ultrastrong magnetic field, B ~ 10^15 G....
Discovery of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 (2005)
Galloway, D. K., Markwardt, C. B., Morgan, E. H., Chakrabarty, D., Strohmayer, T. E.
We report on observations of the sixth accretion-powered millisecond pulsar, IGR J00291+5934, with the Rossi X-Ray Timing Explorer. The source is a faint, recurrent X-ray transient initially...
Erratum: The Swift Gamma-Ray Burst Mission (2005)
Gehrels, N., Chincarini, G., Giommi, P., Mason, K. O., Nousek, J. A., Wells, A. A., ...
A short gamma-ray burst apparently associated with an elliptical galaxy at redshift 0.225 (2005)
Gehrels, Neil, Sarazin, C.L., O'Brien, Paul T., Zhang, B., Barbier, L., Barthelmy, Scott D., ...
SAX J1808.4-3658 is in Outburst Again (2005)
Markwardt, C.B., Swank, J., Wijnands, R.A.D., Zand, J.I.t. In't
RXTE PCA Bulge scans on May 31, 23h UTC, indicate that a source consistent with the position of SAX J1808.4-3658 has entered outburst. The previous outburst of J1808 was in October 2002, and this...
A short gamma-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225 (2005)
Gehrels, N., Sarazin, C.L., O'Brien, P.T., Zhang, B., Barbier, L., Barthelmy, S.D., ...
Gamma-ray bursts (GRBs) come in two classes: long (> 2s), soft-spectrum bursts and short, hard events. Most progress has been made on understanding the long GRBs, which are typically observed at high...
Wijnands, R.A.D., Maccarone, T., Miller Jones, J.C.A., Klis, M. Van Der, Rupen, M., Zand, J.I.t. In't, ...
The Galactic Center region was observed in a series of 7 pointings with the Chandra X-ray Observatory on 5 June 2005 01:44-13:08 UTC. During these observations we found that the two faint X-ray...
Linares Alegret, M., Klis, M. Van Der, Altamirano, D., Markwardt, C.B.
We report the discovery of twin kilohertz quasi-periodic oscillations (kHz QPOs) in the X-ray flux of XTE J1807-294, the fourth accreting millisecond pulsar (AMP). This is the second AMP exhibiting...
Renewed activity of the neutron star X-ray transient SAX J1747.0-2853 (2005)
Wijnands, R.A.D., Miller Jones, J.C.A., Klis, M. Van Der, Rupen, M., Zand, J.J.M. In't, Wang, Q.D., ...
An X-ray transient was detected in outburst on 18 October 2005 during one of our Chandra/HRC-I observations as part of the XMM-Newton/Chandra monitoring campaign of the 1.7 square degree around Sgr...
Further Chandra observations of SAX J1747.0-2853 and the region around Sgr A* (2005)
Wijnands, R.A.D., Rupen, M., Steeghs, D., Wang, Q.D., Cackett, E., Kuulkers, E., ...
On 20-21 October 2005, the remaining six Chandra/HRC-I observations (as mentioned in ATEL #637) were performed as part of the XMM-Newton/ Chandra monitoring campaign of the 1.7 square degree region...
Pointed RXTE observations of SAX J1808.4-3658 (2005)
Wijnands, R.A.D., Klein Wolt, M., Linares Alegret, M., Klis, M. Van Der, Chakrabarty, D., Morgan, E.H., ...
Follow-up RXTE PCA observations of the transient source consistent with the position of SAX J1808.4-3658 (ATEL#505) showed clear coherent pulsations at approximately 401 Hz. This frequency is...
A giant gamma-ray flare from the magnetar SGR 1806 - 20 (2005)
Palmer, D.M., Barthelmy, S., Gehrels, N., Kippen, R.M., Cayton, T., Kouveliotou, C., ...
Two classes of rotating neutron stars-soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars-are magnetars, whose X-ray emission is powered by a very strong magnetic field (B ~ 1015G). SGRs...
A giant y-ray flare from the magnetar SGR 1806-20. (2005)
Palmer, D.M., Barthelmy, S., Gehrels, N., Kippen, R.M., Cayton, T., Kouveliotou, C., ...
Edge, W. R. T., Coe, M. J., Galache, J. L., McBride, V. A., Corbet, R. H. D., Markwardt, C. B., ...
Three new X-ray pulsars have been detected in the Small Magellanic Cloud (SMC) and the positions of two others have been determined, with archive Chandra data. A series of five observations of the...
Monitoring and Discovering X-ray Pulsars in the Small Magellanic Cloud (2004)
Corbet, R. H. D., Laycock, S., Coe, M. J., Marshall, F. E., Markwardt, C. B.
Regular monitoring of the SMC with RXTE has revealed a huge number of X-ray pulsars. Together with discoveries from other satellites at least 45 SMC pulsars are now known. One of these sources, a...
The Swift gamma-ray burst mission (2004)
Gehrels, N., Chincarini, G., Giommi, P., Mason, K. O., Nousek, J. A., Wells, A. A., ...
Long-Term Spectral and Timing Behavior of the Black Hole Candidate XTE J1908+094 (2004)
Gogus, E., Finger, M.H., Kouveliotou, C., Woods, P.M., Patel, S.K., Rupen, M., ...
Werner, N., Zand, J. J. M. In 't, Natalucci, L., Markwardt, C. B., Cornelisse, R., Bazzano, A., ...
SAX J1747.0-2853 is an X-ray transient which exhibited X-ray outbursts yearly between 1998 and 2001, and most probably also in 1976. The outburst of 2000 was the longest and brightest. We have...
A peculiar type-I X-ray burst from GRS 1747-312 (2003)
Zand, J. J. M. In 't, Strohmayer, T. E., Markwardt, C. B., Swank, J.
We report the serendipitous detection with the Rossi X-ray Timing Explorer of a long and peculiar X-ray burst whose localization is consistent with one known X-ray burster (GRS 1747-312) and which...
Zand, J. J. M. In 't, Hulleman, F., Markwardt, C. B., Mendez, M., Kuulkers, E., Cornelisse, R., ...
GRS 1747-312 is a bright transient X-ray source in the globular cluster Terzan 6 with quasi-periodic outbursts approximately every 4.5 months. We carried out 2-60 keV target-of-opportunity...
Nuclear-powered millisecond pulsars and the maximum spin frequency of neutron stars (2003)
Chakrabarty, D., Morgan, E.H., Muno, M.P., Galloway, D.K., Wijnands, R., Klis, M. Van Der, ...
Millisecond X-Ray Pulsar Spins, Gravity Waves, and Glitches (2003)
Chakrabarty, D., Morgan, E.H., Wijnands, R.A.D., Klis, M. Van Der, Markwardt, C.B.
Spin frequency evolution of the accreting mllisecond pulsar SAX J1808.4-3658 (2003)
Morgan, E.H., Chakrabarty, D., Wijnands, R.A.D., Klis, M. Van Der, Markwardt, C.B.
Quasi-periodic X-ray brightness fluctuations in an accreting millisecond pulsar (2003)
Wijnands, R.A.D., Klis, M. Van Der, Homan, J., Chakrabarty, D., Markwardt, C.B., Morgan, E.H.
Discovery of a Second Millisecond Accreting Pulsar: XTE J1751-305 (2002)
Markwardt, C. B., Swank, J. H., Strohmayer, T. E., Zand, J. J. M. In 't, Marshall, F. E.
We report the discovery by the RXTE PCA of a second transient accreting millisecond pulsar, XTE J1751-305, during regular monitoring observations of the galactic bulge region. The pulsar has a spin...
The nature of the X-ray transient SAX J1711.6-3808 (2002)
Zand, J. J. M. In 't, Markwardt, C. B., Bazzano, A., Cocchi, M., Cornelisse, R., Heise, J., ...
SAX J1711.6-3808 is an X-ray transient in the Galactic bulge that was active from January through May of 2001 and whose maximum 1-200 keV luminosity was measured to be 5X10-9 erg/s/cm2 which is less...
Torque Variability in Two Soft Gamma-Ray Repeaters (2002)
Woods, P.M., Kouveliotou, C., Gogus, E., Finger, M.H., Swank, J., Markwardt, C.B., ...
Large torque variations in two soft gamma repeaters (2002)
Woods, P.M., Kouveliotou, C., Gogus, E., Finger, M.H., Swank, J., Markwardt, C.B., ...
Astronomy Astrophysics Discovery of the neutron star nature of SLX 1737-282 (2002)
F. Verbunt, E. Kuulkers, C. B. Markwardt, A. Bazzano, M. Cocchi, R. Cornelisse, ...
Abstract. SLX 1737−282 is a persistent moderately bright X-ray source 1. ◦ 2 from the Galactic center. X-ray observations with the Wide Field Cameras on BeppoSAX have for the first time revealed...
Discovery of a 1247 s pulsar in the Be X-ray binary SAX J2239.3+6116 (2001)
Zand, J. J. M. In 't, Swank, J., Corbet, R. H. D., Markwardt, C. B.
A search for pulsations from the Be X-ray binary SAX J2239.3+6116, through observations with the Narrow Field Instruments on BeppoSAX and the Proportional Counter Array on RXTE, yielded the clear...
A Transition to the Soft State in GRS 1758-258 (2001)
Smith, D. M., Heindl, W. A., Markwardt, C. B., Swank, J. H.
Near the end of 2001 February, the black-hole candidate (BHC) GRS 1758-258 made an abrupt transition from a standard hard (low) state to a soft state. Unlike Cyg X-1 and other BHCs, whose luminosity...
The likely optical counterpart of X-ray transient KS 1731-260 (2001)
Wijnands, R.A.D., Groot, P.J., Miller, J., Markwardt, C.B., Lewin, W.H.G., Klis, M. Van Der
The Erratic Luminosity Behavior of SAX J1808.4-3658 during Its 2000 Outburst (2001)
Wijnands, R.A.D., Mendez, R.M., Markwardt, C.B., Klis, M. Van Der, Chakrabarty, D., Morgan, E.
The orbital period of the recurrent X-ray transient in Terzan 6 (1999)
Zand, J. J. M. In 't, Bazzano, A., Cocchi, M, Cornelisse, R., Heise, J., Kuiper, L., ...
Four or five new outbursts were detected of the bright X-ray transient GRS 1747-312 in the globular cluster Terzan 6 between 1996 and 1999, through monitoring campaigns with the Wide Field Cameras...