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...
The SXI telescope on board EXIST: scientific performances (2009)
Natalucci, L., Bazzano, A., Campana, S., Caraveo, P., Della Ceca, R., Grindlay, J. E., ...
The SXI telescope is one of the three instruments on board EXIST, a multiwavelength observatory in charge of performing a global survey of the sky in hard X-rays searching for Supermassive Black...
Discovery of a Relativistic Supernova Without a Gamma-ray Trigger (2009)
Soderberg, A. M., Chakraborti, S., Pignata, G., Chevalier, R. A., Chandra, P., Ray, A., ...
Type Ibc supernovae (SNe Ibc) mark the gravitational collapse of some massive stars (M > 20 Msun) propelling several solar masses of material to typical velocities of ~10,000 km/s. The...
The High-Metallicity Explosion Environment of the Relativistic Supernova 2009bb (2009)
Levesque, E. M., Soderberg, A. M., Foley, R. J., Berger, E., Kewley, L. J., Chakraborti, S., ...
We investigate the environment of the nearby (d ~ 40Mpc) broad-lined Type Ic supernova SN 2009bb. This event was observed to produce a relativistic outflow likely powered by a central accreting...
Two Rapidly Variable Galactic X-ray Transients Observed with Chandra, XMM and Suzaku (2009)
Heinke, C. O., Tomsick, J. A., Yusef-Zadeh, F., Grindlay, J. E.
We have identified two moderately bright, rapidly variable transients in new and archival X-ray data near the Galactic center. Both objects show strong, flaring variability on timescales of tens to...
Probing Quiescent Massive Black Holes: Insights from Tidal Disruption Events (2009)
Gezari, Suvi, Strubbe, Linda, Bloom, Joshua S., Grindlay, J. E., Soderberg, Alicia, Elvis, Martin, ...
Tidal disruption events provide a unique probe of quiescent black holes in the nuclei of distant galaxies. The next generation of synoptic surveys will yield a large sample of flares from the tidal...
Chandra X-Ray Observatory Observations of the Globular Cluster M71 (2008)
Elsner, R. F., Heinke, C. O., Cohn, H. N., Lugger, P. M., Maxwell, J. E., Stairs, I. H., ...
We observed the nearby, low-density globular cluster M71 (NGC 6838) with the Chandra X-ray Observatory to study its faint X-ray populations. Five X-ray sources were found inside the cluster core...
Energetic X-ray Imaging Survey Telescope (EXIST) (2008)
J. E. Grindlay, T. A. Prince, N. Gehrels, J. Tueller, C. J. Hailey, B. D. Ramsey, ...
We have begun to study a mission to carry out the rst high sensitivity imaging survey of the entire sky at hard x-ray energies (5-600 keV). The Energetic X-ray Imaging Survey Telescope (EXIST) would...
Chandra X-ray Observatory observations of the globular cluster M71 (2008)
Elsner, R.F., Heinke, C.O., Cohn, H.N., Lugger, P.M., Maxwell, J.E., Stairs, I.H., ...
We observe the nearby, low-density globular cluster M71 (NGC 6838) with the Chandra X-Ray Observatory to study its faint X-ray populations. Five X-ray sources are found inside the cluster core...
Cackett, E.M., Miller, J.M., Bhattacharyya, S., Grindlay, J.E., Homan, J., Klis, M. Van Der, ...
Using Suzaku observations of three neutron star low-mass X-ray binaries ( Ser X-1, 4U 1820-30, and GX 349+2) we have found broad, asymmetric, relativistic Fe K emission lines in all three objects....
J. E. Grove, J. E. Grindlay, B. A. Harmon, M. Mcconnell
Abstract. Observations of galactic black hole candidates made by the instruments aboard the Compton GRO in the hard X-ray and fl-ray bands have significantly enhanced our knowledge of the emission...
A Supersoft Variable Low Luminosity X-Ray Source In The Globular Cluster M3 (2007)
Hertz Grindlay And, J. E. Grindlay, C. D. Bailyn
The globular cluster M3 (NGC 5272) was observed twice with the ROSAT high resolution imager in order to study the low luminosity X-ray source 1E1339.8+2837. In 1992 January 1E1339.8+2837 had an X-ray...
Galactic Black Hole Binaries: High-Energy Radiation (2007)
J. E. Grove, J. E. Grindlay, B. A. Harmon, M. Mcconnell
Abstract. Observations of galactic black hole candidates made by the instruments aboard the Compton GRO in the hard X-ray and γ-ray bands have significantly enhanced our knowledge of the emission...
Energetic X-ray Imaging Survey Telescope (EXIST) (2007)
J. E. Grindlay, T. A. Prince, N. Gehrels, J. Tueller, C. J. Hailey, B. D. Ramsey, ...
We have begun to study a mission to carry out the rst high sensitivity imaging survey of the entire sky at hard x-ray energies (5-600 keV). The Energetic X-ray Imaging Survey Telescope (EXIST) would...
Gamma-Ray Burst Studies With the Energetic X-ray Imaging Survey Telescope (EXIST) (2007)
F. A. Harrison, N. Gehrels, J. E. Grindlay, C. J. Hailey, T. A. Prince, B. D. Ramsey, ...
The Energetic X-ray Imaging Survey Telescope (EXIST) is a sensitive, wide eld of view hard X-ray (10 { 600 keV) coded-aperture telescope. This paper describes the capabilities and characteristics of...
EXIST's Gamma-Ray Burst Sensitivity (2007)
Band, D. L., Grindlay, J. E., Hong, J., Fishman, G., Hartmann, D. H., Garson III, A., ...
We use semi-analytic techniques to evaluate the burst sensitivity of designs for the EXIST hard X-ray survey mission. Applying these techniques to the mission design proposed for the Beyond Einstein...
Wide Field Hard X-ray Survey Telescope: ProtoEXIST1 (2007)
Hong, J., Grindlay, J. E., Chammas, N., Allen, B., Copete, A., Said, B., ...
We report our progress on the development of pixellated imaging CZT detector arrays for our first-generation balloon-borne wide-field hard X-ray (20 - 600 keV) telescope, ProtoEXIST1. Our ProtoEXIST...
An ultrahigh-speed digitizer for the Harvard College Observatory astronomical plates (2006)
Simcoe, R. J., Grindlay, J. E., Los, E. J., Doane, A., Laycock, S. G., Mink, D. J., ...
A machine capable of digitizing two 8 inch by 10 inch (203 mm by 254 mm) glass astrophotographic plates or a single 14 inch by 17 inch (356 mm by 432 mm) plate at a resolution of 11 microns per pixel...
CZT imaging detectors for ProtoEXIST (2006)
Hong, J., Grindlay, J. E., Chammas, N., Copete, A., Baker, R. G., Barthelmy, S. D., ...
We describe the detector development for a balloon-borne wide-field hard X-ray (20 - 600 keV) telescope, ProtoEXIST. ProtoEXIST is a pathfinder for both technology and science of the proposed...
Boirin, L., Parmar, A. N., Barret, D., Paltani, S., Grindlay, J. E.
We report the discovery of narrow Fe XXV and Fe XXVI K alpha X-ray absorption lines at 6.65 and 6.95 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an...
Faint X-ray Sources in the Globular Cluster Terzan 5 (2006)
Heinke, C. O., Wijnands, R., Cohn, H. N., Lugger, P. M., Grindlay, J. E., Pooley, D., ...
We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6 keV X-ray luminosity of 3*10^{31} ergs/s within the...
Wijnands, R.A.D., Kuulkers, E., Muno, M.P., Cackett, E.M., 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,...
Faint X-Ray Sources in the Globular Cluster Terzan 5 (2006)
Heinke, C.O., Wijnands, R.A.D., Cohn, H.N., Lugger, P.M., Grindlay, J.E., Pooley, D., ...
We report our analysis of a Chandra X-ray observation of the rich globular cluster Terzan 5, in which we detect 50 sources to a limiting 1.0-6 keV X-ray luminosity of 3¿031 ergs s-1 within the...
Short gamma-ray bursts from binary neutron star mergers in globular clusters (2006)
Grindlay, J.E., Zwart, S. Portegies, McMillan, S.L.W.
Observations by the Swift gamma-ray-burst (GRB) mission located short GRBs in (or near) elliptical galaxies, that are no longer active in star formation. This suggested that short GRBs are produced...
A Chandra X-ray observation of the globular cluster Terzan 1 (2006)
Cackett, E.M., Wijnands, R.A.D., Heinke, C.O., Pooley, D., Lewin, W.H.G., Grindlay, J.E., ...
We present a ~19-ks Chandra Advanced CCD Imaging Spectrometer (ACIS)-S observation of the globular cluster Terzan 1. 14 sources are detected within 1.4arcmin of the cluster centre with two of these...
A Chandra X-ray observation of the globular cluster Terzan 1 (2005)
Cackett, E. M., Wijnands, R., Heinke, C. O., Pooley, D., Lewin, W. H. G., Grindlay, J. E., ...
We present a 19 ks Chandra ACIS-S observation of the globular cluster Terzan 1. Fourteen sources are detected within 1.4 arcmin of the cluster center with 2 of these sources predicted to be not...
Low and High Frequency Quasi-Periodic Oscillations in 4U1915-05 (2005)
Boirin, L., Barret, D., Olive, J. F., Bloser, P. F., Grindlay, J. E.
The X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was observed 19 times for a total exposure of roughly 140 ks between 1996 February and October with the proportional counter array...
Hong, J., Copete, A., Grindlay, J. E., Vadawale, S. V., Craig, W. W., Harrison, F., ...
We outline our plan to develop ProtoEXIST, a balloon-borne prototype experiment for the Energetic X-ray Imaging Survey Telescope (EXIST) for the Black Hole Finder Probe. EXIST will consist of...
Vadawale, S. V., Hong, J., Grindlay, J. E., Skinner, G.
EXIST is being studied as the Black Hole Finder Probe, one of the 3 Einstein Probe missions under NASA's Beyond Einstein program. The major science goals for EXIST include highly sensitive full-sky...
Chandra Multiwavelength Plane (ChaMPlane) Survey: an Introduction (2005)
Grindlay, J. E., Hong, J., Zhao, P., Laycock, S., Berg, M. Van Den, Koenig, X., ...
We introduce the Chandra Multiwavelength Plane (ChaMPlane) Survey, designed to measure or constrain the populations of low-luminosity (Lx > ~10^31 erg/s) accreting white dwarfs, neutron stars and...
A Deep Chandra Survey of the Globular Cluster 47 Tucanae: Catalog of Point Sources (2005)
Heinke, C. O., Grindlay, J. E., Edmonds, P. D., Cohn, H. N., Lugger, P. M., Camilo, F., ...
We have detected 300 X-ray sources within the half-mass radius (2.79') of the globular cluster 47 Tucanae in a deep (281 ks) Chandra exposure. We perform photometry and simple spectral fitting for...
X-ray Binaries in the Globular Cluster 47 Tucanae (2005)
Heinke, C. O., Grindlay, J. E., Edmonds, P. D., Cohn, H. N., Lugger, P. M., Camilo, F., ...
Chandra observations of globular clusters provide insight into the formation, evolution, and X-ray emission mechanisms of X-ray binary populations. Our recent (2002) deep observations of 47 Tuc allow...
Using the EXIST Active Shields for Earth Occultation Observations of X-ray Sources (2005)
Wilson, Colleen A., Fishman, G. J., Grindlay, J. E., Krawczynski, H.
The EXIST active shields, planned for the main detectors of the coded aperture telescope, will have approximately 15 times the area of the BATSE detectors, and they will have a good geometry on the...
Wijnands, R.A.D., Heinke, C.O., Pooley, D., Edmonds, P.D., Lewin, W.H.G., Grindlay, J.E., ...
We present a Chandra observation of the globular cluster Terzan 5 during times when the neutron star X-ray transient EXO 1745-248 located in this cluster was in its quiescent state. We detected the...
Cackett, E.M., Wijnands, R.A.D., Heinke, C.O., Edmonds, P.D., Lewin, W.H.G., Pooley, D., ...
The globular cluster NGC 6440 is known to harbor a bright neutron star X-ray transient. We observed the globular cluster with Chandra on two occasions when the bright transient was in its quiescent...
X-ray Binaries in Terzan 5 (2005)
Heinke, C.O., Wijnands, R.A.D., Grindlay, J.E., Cohn, H.N., Lugger, P.M., Edmonds, P.D., ...
Terzan 5 is a rich globular cluster located near the Galactic Center, containing a transient LMXB and a large number of millisecond pulsars. Two Chandra observations have identified the transient...
Three Additional Quiescent Low-Mass X-ray Binary Candidates in 47 Tucanae (2004)
Heinke, C. O., Grindlay, J. E., Edmonds, P. D.
We identify through their X-ray spectra one certain (W37) and two probable (W17 and X4) quiescent low-mass X-ray binaries (qLMXBs) containing neutron stars in a long Chandra X-ray exposure of the...
Three Years of ChaMPlane Northern Field WIYN Spectroscopy (2004)
Rogel, A. B., Lugger, P. M., Cohn, H. N., Slavin, S. D., Grindlay, J. E., Zhao, P., ...
We present initial results of WIYN spectroscopic observations of selected objects detected in the Chandra Multiwavelength Plane (ChaMPlane) Survey in fields towards the Galactic anti-center....
Hong, J., Vadawale, S. V., Zhang, M., Bellm, E. C., Yousef, A., Noss, J., ...
The proposed black-hole finder mission EXIST will consist of multiple wide-field hard X-ray coded-aperture telescopes. The high science goals set for the mission require innovations in telescope...
Harmon, B. A., Wilson, C. A., Fishman, G. J., Connaughton, V., Henze, W., Paciesas, W. S., ...
The Burst and Transient Source Experiment (BATSE), aboard the Compton Gamma Ray Observatory (CGRO), provided a record of the low-energy gamma-ray sky (20-1000 keV) between 1991 April and 2000 May...
Boirin, L., Parmar, A. N., Barret, D., Paltani, S., Grindlay, J. E.
We report the discovery of narrow Fe XXV and Fe XXVI K alpha X-ray absorption lines at 6.65 and 6.95 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an...
EXITE2 Observation of the SIGMA Source GRS 1227+025 (2004)
Grindlay, J. E., Bloser, P. F., Chou, Y., Narita, T.
We report the EXITE2 hard X-ray imaging of the sky around 3C273. A 2h observation on May 8, 1997, shows a $\sim$260 mCrab source detected at $\sim4\sigma$ in each of two bands (50-70 and 70-93 keV)...
Boirin, L., Parmar, A. N., Barret, D., Paltani, S., Grindlay, J. E.
We report the discovery of narrow Fe XXV and Fe XXVI K alpha X-ray absorption lines at 6.65 and 6.95 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an...
Boirin, L., Parmar, A. N., Barret, D., Paltani, S., Grindlay, J. E.
We report the discovery of narrow Fe XXV and Fe XXVI K alpha X-ray absorption lines at 6.65 and 6.95 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an...
Haggard, D., Cool, A. M., Anderson, J., Edmonds, P. D., Callanan, P. J., Heinke, C. O., ...
We report the discovery of an optical counterpart to a quiescent neutron star in the globular cluster Omega Centauri (NGC 5139). The star was found as part of our wide-field imaging study of Omega...
Cathode depth sensing in CZT detectors (2003)
Hong, J., Bellm, E. C., Grindlay, J. E., Narita, T.
Measuring the depth of interaction in thick Cadmium-Zinc-Telluride (CZT) detectors allows improved imaging and spectroscopy for hard X-ray imaging above 100 keV. The Energetic X-ray Imaging Survey...
Simultaneous observations of the quasar 3C 273 with INTEGRAL, XMM-Newton and RXTE (2003)
Courvoisier, T. J. -L., Beckmann, V., Bourban, G., Chenevez, J., Chernyakova, M., Deluit, S., ...
INTEGRAL has observed the bright quasar 3C 273 on 3 epochs in January 2003 as one of the first observations of the open programme. The observation on January 5 was simultaneous with RXTE and...
A Chandra X-ray Study of the Globular Cluster M80 (2003)
Heinke, C. O., Grindlay, J. E., Edmonds, P. D., Lloyd, D. A., Murray, S. S., Cohn, H. N., ...
We report our analysis of a Chandra X-ray observation of the rich globular cluster M80, in which we detect some 19 sources to a limiting 0.5-2.5 keV X-ray luminosity of 7*10^30 ergs/s within the...
Analysis of the Quiescent Low-Mass X-ray Binary Population in Galactic Globular Clusters (2003)
Heinke, C. O., Grindlay, J. E., Lugger, P. M., Cohn, H. N., Edmonds, P. D., Lloyd, D. A., ...
Quiescent low-mass X-ray binaries (qLMXBs) containing neutron stars have been identified in several globular clusters using Chandra or XMM X-ray observations, using their soft thermal spectra. We...
X-ray Dip Monitoring of XB 1916-053 (2003)
Narita, T., Grindlay, J. E., Bloser, P. F., Chou, Y.
We report on the long term monitoring of X-ray dips from the ultracompact low-mass X-ray binary (LMXB) XB 1916-053. Roughly one-month interval observations were carried out with the Rossi X-ray...
A Chandra Study of the Dense Globular Cluster Terzan 5 (2003)
Heinke, C. O., Edmonds, P. D., Grindlay, J. E., Lloyd, D. A., Cohn, H. N., Lugger, P. M.
We report a Chandra ACIS-I observation of the dense globular cluster Terzan 5. The previously known transient low-mass x-ray binary (LMXB) EXO 1745-248 in the cluster entered a rare high state during...
X-ray Studies of Two Neutron Stars in 47 Tucanae: Toward Constraints on the Equation of State (2003)
Heinke, C. O., Grindlay, J. E., Lloyd, D. A., Edmonds, P. D.
We report spectral and variability analysis of two quiescent low mass X-ray binaries (X5 and X7, previously detected with the ROSAT HRI) in a Chandra ACIS-I observation of the globular cluster 47...
EXIST: Mission Design Concept and Technology Program (2002)
Grindlay, J. E., Craig, W. W., Gehrels, N., Harrison, F. A., Hong, J.
The Energetic X-ray Imaging Survey Telescope (EXIST) is a proposed very large area coded aperture telescope array, incorporating 8m^2 of pixellated Cd-Zn-Te (CZT) detectors, to conduct a full-sky...
X-ray and Optical Studies of Millisecond Pulsars in 47 Tucanae (2002)
Heinke, C. O., Grindlay, J. E., Edmonds, P. D., Camilo, F.
Our Chandra X-ray observation of the globular cluster 47 Tuc clearly detected most of the 16 MSPs with precise radio positions, and indicates probable X-ray emission from the remainder. The MSPs are...
Chandra Study of a Complete Sample of Millisecond Pulsars in 47Tuc and NGC6397 (2002)
Grindlay, J. E., Camilo, F., Heinke, C. O., Edmonds, P. D., Cohn, H., Lugger, P.
We report Chandra observations of the complete sample of millisecond pulsars (MSPs) with precise radio positions in the globular clusters 47Tuc (NGC104) and NGC6397. The 47Tuc MSPs are predominantly...
Bloser, P. F., Chou, Y., Grindlay, J. E., Narita, J., Monnelly, G.
We present the spectral analysis system for the second- generation energetic X-ray imaging telescope experiment (EXITE2) balloon payload. EXITE2 is an imaging hard X-ray telescope using a...
Balloon flight background meaurement with actively-shielded planar and imaging CZT detecors (2002)
Bloser, P. F., Narita, T., Jenkins, J. A., Perrin, M., Murray, R., Grindlay, J. E.
Chandra on Millisecond Pulsars in Globular Clusters (2001)
Grindlay, J. E., Heinke, C. O., Edmonds, P. D., Camilo, F.
We summarize the x-ray properties of the complete samples of millisecond pulsars (MSPs) detected in our Chandra observations of the globular clusters 47 Tuc and NGC 6397. The 47 Tuc MSPs are...
Variability and Spectra of Two Neutron Stars in 47 Tucanae (2001)
Heinke, C. O., Grindlay, J. E., Lloyd, D. A., Edmonds, P. D.
We report spectral and variability analysis of two quiescent low mass x-ray binaries (previously identified with ROSAT HRI as X5 and X7) in the globular cluster 47 Tuc, from a Chandra ACIS-I...
Balloon Flight Background Measurement with Actively-Shielded Planar and Imaging CZT Detectors (2001)
Bloser, P. F., Narita, T., Jenkins, J. A., Perrin, M., Murray, R., Grindlay, J. E.
We present results from the flight of two prototype CZT detectors on a scientific balloon payload in September 2000. The first detector, referred to as ``CZT1,'' consisted of a 10 mm x 10 mm x 2 mm...
Bloser, P. F., Chou, Y., Grindlay, J. E., Narita, T., Monnelly, G.
We present the spectral analysis system for the second-generation Energetic X-ray Imaging Telescope Experiment (EXITE2) balloon payload. EXITE2 is an imaging hard X-ray telescope using a...
Binary and Long-Term (Triple?) Modulations of 4U 1820$-$30 in NGC 6624 (2001)
We present timing analysis results for Rossi x-ray Timing Explorer (RXTE) observations of x-ray binary source 4U 1820$-$30 located in the globular cluster NGC 6624. The light curves of observations...
Chandra Exposes the Core Collapsed Globular Cluster NGC 6397 (2001)
Grindlay, J. E., Heinke, C. O., Edmonds, P. D., Murray, S. S., Cool, A. M.
We report results of the Chandra deep imaging observation of the closest post-core collapse globular cluster, NGC 6397. Some 25 sources are detected within 2 arcmin of the cluster center of which...
Identification of the LMXB and Faint X-ray Sources in NGC 6652 (2001)
Heinke, C. O., Edmonds, P. D., Grindlay, J. E.
We have detected three new x-ray point sources, in addition to the known low-mass x-ray binary (LMXB) X1832-330, in the globular cluster NGC 6652 with a Chandra 1.6 ksec HRC-I exposure. Star 49...
Timing Analysis of the Light Curve of the Dipping-Bursting X-ray Binary X1916-053 (2000)
Chou, Y., Grindlay, J. E., Bloser, P. F.
We present the timing analysis results for our observations of the x-ray dip source X1916-053 conducted with RXTE between February and October of 1996. Our goal was to finally measure the binary...
Stellar Variability in the Globular Cluster Terzan 5 (2000)
Edmonds, P. D., Grindlay, J. E., Cohn, H. N., Lugger, P. M.
We present the results of a search for variability in and near the core of the metal-rich, obscured globular cluster Terzan 5, using NICMOS on HST. This extreme cluster has approximately solar...
ASCA Observations of GX 354-0 and KS 1731-260 (2000)
Narita, T., Grindlay, J. E., Barret, D.
We report on ASCA observations of the low mass X-ray binaries GX 354-0 and KS 1731-260. The spectrum of GX 354-0 is best described as a power-law or a Comptonized spectrum with tau ~ 5 and kT ~ 8 keV...
Development of Gold Contacted Flip-chip Detectors with IMARAD CZT (2000)
Narita, T., Bloser, P. F., Grindlay, J. E., Jenkins, J. A.
We present initial results from our evaluation of a gold-contacted pixellated detector using cadmium zinc telluride substrate produced by IMARAD Imaging Systems. The Horizontal Bridgman (HB) grown...
Bloser, P. F., Narita, T., Jenkins, J. A., Grindlay, J. E.
We report on the construction and laboratory testing of pixellated CZT detectors mounted in a flip-chip, tiled fashion and read out by an ASIC, as required for proposed hard X-ray astronomy missions....
Low and High Frequency Quasi-Periodic Oscillations in 4U1915-05 (2000)
Boirin, L., Barret, D., Olive, J. F., Bloser, P. F., Grindlay, J. E.
The X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was observed 19 times for a total exposure of roughly 140 ks between 1996 February and October with the proportional counter array...
RXTE Studies of Long-Term X-ray Spectral Variations in 4U 1820-30 (2000)
Bloser, P. F., Grindlay, J. E., Kaaret, P., Zhang, W., Smale, A. P., Barret, D.
We present the results of detailed spectral studies of the ultra-compact low mass X-ray binary (LMXB) 4U 1820-30 carried out with the Rossi X-ray Timing Explorer (RXTE) during 1996-7. 4U 1820-30 is...
RXTE Studies of X-ray Spectral Variations with Accretion Rate in 4U 1915-05 (2000)
Bloser, P. F., Grindlay, J. E., Barret, D., Boirin, L.
We present the results of detailed spectral studies of the ultra-compact low mass X-ray binary (LMXB) 4U 1915-05 carried out with the Rossi X-ray Timing Explorer (RXTE) during 1996. 4U 1915-05 is an...
Low and High Frequency Quasi-Periodic Oscillations in 4U1915-05 (2000)
Boirin, L., Barret, D., Olive, J. F., Bloser, P. F., Grindlay, J. E.
The X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was observed 19 times for a total exposure of roughly 140 ks between 1996 February and October with the proportional counter array...
Low and High Frequency Quasi-Periodic Oscillations in 4U1915-05 (2000)
Boirin, L., Barret, D., Olive, J. F., Bloser, P. F., Grindlay, J. E.
The X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was observed 19 times for a total exposure of roughly 140 ks between 1996 February and October with the proportional counter array...
Hard X-ray Emission From Low Mass X-ray Binaries (1999)
Barret, D., Olive, J. F., Boirin, L., Done, C., Skinner, G. K., Grindlay, J. E.
We report on Rossi X-ray Timing Explorer observations of four type I X-ray bursters; namely 1E1724-3045, GS1826-238, SLX1735-269 and KS1731-260. The first three were in a low state (LS) whereas...
Design and Testing of a Prototype Pixellated CZT Detector and Shield for Hard X-Ray Astronomy (1999)
Bloser, P. F., Grindlay, J. E., Narita, T., Jenkins, J. A.
We report on the design and laboratory testing of a prototype imaging CZT detector intended for balloon flight testing in April 2000. The detector tests several key techniques needed for the...
Strong Field Gravity and X-Ray Observations of 4U1820-30 (1999)
Kaaret, P., Piraino, S., Bloser, P. F., Ford, E. C., Grindlay, J. E., Santangelo, A., ...
The behavior of quasi-periodic oscillations (QPOs) at frequencies near 1 kHz in the x-ray emission from the neutron star x-ray binary 4U1820-30 has been interpreted as evidence for the existence of...
Low and high frequency Quasi-Periodic Oscillations in 4U1915-05 (1999)
Boirin, L., Barret, D., Olive, J. F., Grindlay, J. E., Bloser, P. F.
The burster and dipper Low Mass X-ray Binary (LMXB) 4U1915-05 (also known as XB1916-053) was observed by the Rossi X-ray Timing Explorer (RXTE) 19 times for a total exposure of 140 ks between 1996...
Strong field gravity and x-ray observations of 4U1820-30 (1999)
Kaaret, P., Piraino, S., Bloser, P.F., Ford, E.C., Grindlay, J.E., Santangelo, A., ...
RXTE Broad Band X-ray Spectrum of the Burster 1E1724-3045 (1998)
Olive, J. F., Barret, D., Boirin, L., Grindlay, J. E.
The X-ray burster 1E1724-3045 located in the globular cluster Terzan 2 is known as one of the persistent (though variable) hard X-ray sources as shown by the SIGMA observations of the Galactic Center...
Discovery of High Frequency Quasi-Periodic Oscillations in 4u1915-05 (1998)
Barret, D., Boirin, L., Olive, J. F., Grindlay, J. E., Bloser, P. F., Swank, J., ...
The type I X-ray burster and dipper 4U1915-05 (also known as XB1916-053) was monitored by the Rossi X-ray Timing Explorer between February and October, 1996. The source was observed in various...
An ASCA X-ray Observation of 1E1724-3045 in the globular cluster Terzan 2 (1998)
Barret, D., Grindlay, J. E., Harrus, I. M., Olive, J. F.
The bright persistent X-ray source and type I X-ray burster 1E1724-3045 located in the globular cluster Terzan 2 was observed by ASCA for about 10 ksec on September 24-25th, 1995 while it was in its...
Galactic Black Hole Binaries: High-Energy Radiation (1998)
Grove, J. E., Grindlay, J. E., Harmon, B. A., Kazanas, D., McConnell, M.
Observations of galactic BHCs made by the Compton GRO in the hard X-ray and gamma-ray bands have significantly enhanced our knowledge of the emission properties of these objects. Understanding these...
Spin-up of low luminosity low mass X-ray binaries (1998)
We examine the spin-up of low luminosity, low mass X-ray binaries (LMXBs) to millisecond pulsars (MSPs). In the conventional spin-up model of the Ghosh & Lamb type, where the stellar magnetic field...
Olive, J. F., Barret, D., Boirin, L., Grindlay, J. E., Swank, J. H., Smale, A. P.
We report on the RXTE/PCA observation of the X-ray burster 1E1724-3045 located in the globular cluster Terzan 2. The persistent X-ray emission shows a high level of noise variability, the so-called...
Proposed (to) EXIST: Hard X-ray Imaging All Sky Survey/Monitor (1997)
Grindlay, J. E., Prince, T. A., Harrison, F., Gehrels, N., Hailey, C. J., Ramsey, B., ...
The hard x-ray (10-600 keV) sky is inherently time variable and yet has neither been surveyed nor monitored with a sensitive imaging telescope. The Energetic X-ray Imaging Survey Telescope (EXIST) is...
Kilo-hertz QPO and X-ray Bursts in 4U 1608-52 in Low Intensity State (1997)
Yu, W., Zhang, S. N., Harmon, B . A., Paciesas, W. S., Robinson, C. R., Grindlay, J. E., ...
We present the results from RXTE/PCA observations of 4U 1608-52 in its island state on March 15, 18 and 22 of 1996. Three type I X-ray bursts were detected in one RXTE orbit on March 22. We observed...
Kilo-hertz QPO in Island State of 4U1608-52 as Observed with RXTE/PCA (1997)
Yu, W., Zhang, S. N., Harmon, B . A., Paciesas, W. S., Robinson, C. R., Grindlay, J. E., ...
We report RXTE/PCA observations of 4U 1608-52 on March 15, 18 and 22 immediately after the outburst in early 1996. The persistent count rates ranged from 190 to 450 cps (1-60 keV). During this period...
VERITAS: Very LArge Energetic Radiation Imaging Telescope Array System (1997)
Weekes, T. C., Akerlof, C., Biller, S., Breslin, A. C., Buckley, J. H., Carter-Lewis, D. A., ...
A next generation atmospheric Cherenkov observatory is described based on the Whipple Observatory $\gamma$-ray telescope. A total of nine such imaging telescopes will be deployed in an array that...
KiloHertz Quasi-Periodic oscillations in Island State of 4U 1608-52 as observed with RXTE/PCA (1997)
Yu, W., Zhang, S.N., Harmon, B.A., Paciesas, W.S., Robinson, C.R., Grindlay, J.E., ...
The Distance of the Soft Gamma Repeater SGR 1806-20 (1996)
Corbel, S., Wallyn, P., Dame, T. M., Durouchoux, P., Mahoney, W. A., Vilhu, O., ...
We present CO(J=1-0) observations in the direction of the Soft Gamma Repeater SGR 1806-20 with the SEST telescope. We detected several molecular clouds, and we discuss in this paper the implications...