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...
Soft gamma-ray optics: new Laue lens design and performance estimates (2009)
Barriere, N., Natalucci, L., Abrosimov, N., Von Ballmoos, P., Bastie, P., Courtois, P., ...
Laue lenses are an emerging technology based on diffraction in crystals that allows the concentration of soft gamma rays. This kind of optics that works in the 100 keV - 1.5 MeV band can be used to...
Renewed activity from the X-ray transient SAXJ 1810.8-2609 with INTEGRAL (2008)
Fiocchi, M., Natalucci, L., Chenevez, J., Bazzano, A., Tarana, A., Ubertini, P., ...
We report on the results of INTEGRAL observations of the neutron star low mass X-ray binary SAX J1810.8-2609 during its latest active phase in August 2007. The current outburst is the first one since...
The INTEGRAL long monitoring of persistent Ultra Compact X-ray Bursters (2008)
Fiocchi, M., Bazzano, A., Ubertini, P., Bird, A. J., Natalucci, L., Sguera, V.
The combination of compact objects, short period variability and peculiar chemical composition of the Ultra Compact X-ray Binaries make up a very interesting laboratory to study accretion processes...
INTEGRAL Cross-calibration Status: Crab observations between 3 keV and 1 MeV (2008)
Jourdain, E., Gotz, D., Westergaard, N. J., Natalucci, L., Roques, J. P.
We present results of Crab observations by the INTEGRAL instruments. A simultaneous fit allows us to demonstrate that INTEGRAL provides reliable spectra over its wide energy range.
Natalucci, L., Feroci, M., Quadrini, E., Ubertini, P., Piro, L., Herder, J. W. Den, ...
The success of the SWIFT/BAT and INTEGRAL missions has definitely opened a new window for follow-up and deep study of the transient gamma-ray sky. This now appears as the access key to important...
Di Cocco, G., Bianchin, V., Foschini, L., Gianotti, F., Laurent, P., Malaguti, G., ...
We report about the status of the PICsIT layer of the imager IBIS. The instrument has been tested in both Spectral Imaging and Spectral Timing Mode. PICsIT Single Events, Multiple and ISGRI data of...
Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., ...
We study the spectrum of the cosmic X-ray background (CXB) in energy range $\sim$5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations with the Earth disk...
Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., ...
We study the spectrum of the cosmic X-ray background (CXB) in energy range $\sim$5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations with the Earth disk...
Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., ...
We study the spectrum of the cosmic X-ray background (CXB) in energy range $\sim$5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations with the Earth disk...
Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., ...
12 pages, 12 figures.-- arXiv:0608250 astro-ph pre-print supplied.-- Final full-text version of the paper available at: http://dx.doi.org/10.1051/0004-6361:20066230.
Churazov, E., Sunyaev, R., Revnivtsev, M., Sazonov, S., Molkov, S., Grebenev, S., ...
We study the spectrum of the cosmic X-ray background (CXB) in energy range $\sim$5-100 keV. Early in 2006 the INTEGRAL observatory performed a series of four 30ksec observations with the Earth disk...
INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region (2005)
De Cesare, G., Bazzano, A., Capitanio, F., Del Santo, M., Lonjou, V., Natalucci, L., ...
Electron-positron annihilation radiation from the Galactic Center region has been detected since the seventies, but its astrophysical origin is still a topic of a scientific debate. We have analyzed...
3-200 keV spectral states and variability of the INTEGRAL black hole binary IGR J17464-3213 (2005)
Capitanio, F., Ubertini, P., Bazzano, A., Kretschmar, P., Zdziarski, A. A., Joinet, A., ...
Unveiling the high energy obscured universe: hunting explosive and collapsed objects physics (2005)
Ubertini, P., Bazzano, A., Cocchi, M., Natalucci, L., Villa, G. E., Bassani, L., ...
3-200 keV spectral states and variability of the INTEGRAL Black Hole binary IGR J17464-3213 (2004)
Capitanio, F., Ubertini, P., Bazzano, A., Kretschmar, P., Zdziarski, A. A., Joinet, A., ...
On March 2003, IBIS, the gamma-ray imager on board the INTEGRAL satellite, detected an outburst from a new source, IGR J17464-3213, that turned out to be a HEAO-1 transient, H1743-322. In this paper...
1E 1740.7-2942: temporal and spectral evolution from INTEGRAL and RXTE observations (2004)
Del Santo, M., Bazzano, A., Zdziarski, A. A., Smith, D. M., Bezayiff, N., Farinelli, R., ...
We present results of the monitoring of the black hole candidate 1E 1740.7-2942 with INTEGRAL, in combination with simultaneous observations by RXTE. We concentrate on broad-band spectra from...
Spectral states and transient behaviour of a sample of X-ray bursters observed by BeppoSax (2004)
Natalucci, L., Bazzano, A., Capitanio, F., Cocchi, M., Ubertini, P.
During observation campaigns of the Galactic Bulge region, BeppoSAX detected a total of 21 new X-ray bursters in about 6 years of operation. These sources are mostly transient and often feature a...
INTEGRAL monitoring of the Black Hole candidate 1E 1740.7-2942 (2004)
Del Santo, M., Bazzano, A., Smith, D. M., Bassani, L., Bird, A. J., Bouchet, L., ...
The brightest persistent Galactic black hole candidate close to the Galactic Centre, 1E 1740.7-2942, has long been observed with INTEGRAL. In this paper, we report on the long-term hard X-ray...
Werner, N., 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...
Two spectral states of the transient X-ray burster SAX J1747.0-2853 (2003)
Natalucci, L., Bazzano, A., Cocchi, M., Ubertini, P., Cornelisse, R., Heise, J., ...
The neutron star binary SAX J1747.0-2853, located in the Galactic Center region at about 0.5 deg from Sgr A* and at a distance of 9 kpc, has been observed in outburst four times (1998, 1999, 2000 and...
Natalucci, L., Bird, A. J., Bazzano, A., Ubertini, P., Stephen, J. B., Terrier, R., ...
The spatial distribution of the background events may affect the source detection capability of IBIS at high energies (> 200 keV) for both ISGRI and PICsIT layers. The observed background is found to...
First IBIS results on the high energy emission of Cyg X-2 (2003)
Natalucci, L., Del Santo, M., Ubertini, P., Capitanio, F., Cocchi, M., Piraino, S., ...
The bright low-mass X-ray binary Cyg X-2 was in the field of view of the IBIS telescope during the early Cygnus region observations, executed during the INTEGRAL Performance Verification Phase. The...
Six years of BeppoSAX Wide Field Cameras observations of nine galactic type-I X-ray bursters (2003)
Cornelisse, R., Verbunt, F., Kuulkers, E., Heise, J., Hartog, P. R. Den, ...
We present an overview of BeppoSAX Wide Field Cameras observations of the nine most frequent type-I X-ray bursters in the Galactic center region. Six years of observations (from 1996 to 2002) have...
Burst-properties as a function of mass accretion rate in GX 3+1 (2003)
Hartog, P. R. Den, Kuulkers, E., Cornelisse, R., Heisse, J., Bazzano, A., ...
GX 3+1 is a low-mass X-ray binary that is persistently bright since its discovery in 1964. It was found to be an X-ray burster twenty years ago proving that the compact object in this system is a...
Natalucci, L, Bird, AJ, Bazzano, A, Ubertini, P, Stephen, JB, Terrier, R, ...
The spatial distribution of the background events may affect the source detection capability of IBIS at high energies (>=200 keV) for both ISGRI and PICsIT layers. The observed background is found to...
BeppoSAX Wide Field Cameras observations of six type I X-ray bursters (2002)
Cornelisse, R., Verbunt, F., Kuulkers, E., Heise, J., Remillard, R. A., ...
We have discovered three certain (SAX J1324.5-6313, 2S 1711-339 and SAX J1828.5-1037) and two likely (SAX J1818.7+1424 and SAX J2224.9+5421) new thermonuclear X-ray burst sources with the BeppoSAX...
The nature of the X-ray transient SAX J1711.6-3808 (2002)
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...
Discovery of the neutron star nature of SLX 1737-282 (2002)
Verbunt, F., Kuulkers, E., Markwardt, C., Bazzano, A., Cocchi, M., ...
SLX 1737-282 is a persistent moderately bright X-ray source 1.2 deg from the Galactic center. X-ray observations with the Wide Field Cameras on BeppoSAX have for the first time revealed the true...
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...
A half-a-day long thermonuclear X-ray burst from KS 1731-260 (2001)
Kuulkers, E., Van Kerkwijk, M. H., Cornelisse, R., Smith, D. A., Heise, J., ...
We report on an approximately twelve hour long X-ray flare from the low-mass X-ray binary KS 1731-260. The flare has a rise time of less than 13 min and declines exponentially with a decay time of...
Discovery of the X-ray burster SAX J1752.3-3138 (2001)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Kuulkers, E., ...
During a 50 ks monitoring observation of the Galactic bulge performed in September 1999 by the Wide Field Cameras on board the BeppoSAX satellite, an X-ray burst was detected from a sky position ~3...
A Sample of Radius-Expansion Bursters Observed by the BeppoSAX-WFCs (2001)
Cocchi, Massimo, Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Kuulkers, E., ...
Since 1996 a monitoring campaign of the Galactic Bulge region has been performed by the BeppoSAX Wide Field Cameras in the 2-28 keV band. This allowed accurate and unbiased studies of classes of...
The first outburst of SAX J1808.4-3658 revisited (2001)
Cornelisse, R., Kuulkers, E., Heise, J., Kuiper, L., Bazzano, A., ...
Data of the 1996 outburst of the single-known accreting millisecond pulsar SAX J1808.4-3658, taken with the Wide Field Cameras (WFCs) on BeppoSAX, are revisited with more complete data coverage and...
Gamma-Ray Imaging with the Coded Mask IBIS Telescope (2001)
Goldwurm, A., Goldoni, P., Gros, A., Stephen, J., Foschini, L., Gianotti, F., ...
The IBIS telescope onboard INTEGRAL, the ESA gamma-ray space mission to be launched in 2002, is a soft gamma-ray (20 keV - 10 MeV) device based on a coded aperture imaging system. We describe here...
Spectral Properties of a Sample of Low Luminosity Type I X-ray Bursters (2001)
I report on a sample of new type I X-ray bursters, firstly detected with the Wide Field Cameras on board BeppoSAX and then studied with the Narrow Field Instruments on a broad spectral range (0.1-200...
Natalucci, L., Bazzano, A., Cocchi, M., Ubertini, P., Heise, J., Kuulkers, E., ...
We report on our discovery and follow-up observations of the X-ray source SAX J1747.0-2853 detected in outburst on 1998, March 10 with the BeppoSAX Wide Field Cameras in the energy range 2-28 keV....
Turmoil on the accretion disk of GRO J1655-40 (2000)
Kuulkers, E., Cornelisse, R., Heise, J., Kong, A. K. H., Charles, P. A., ...
During the 1996/1997 outburst of the X-ray transient GRO J1655-40 the Wide Field Cameras onboard BeppoSAX observed the system with nearly continuous coverage during some stages of this outburst. On...
"Clocked" Bursts From GS 1826-238 (2000)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., ...
We report on the long term monitoring of the GINGA transient source GS 1826-238 performed with the BeppoSAX Wide Fiels Camera (WFC) instrument, during four different observing campaigns covering...
Bright X-ray bursts from 1E 1724-3045 in Terzan 2 (2000)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Kuulkers, E., ...
During about 3 years wide field monitoring of the Galactic Center region by the WFC telescopes on board the BeppoSAX satellite, a total of 14 type-I X-ray bursts were detected from the burster 1E...
Observations of Eddington-limited type-I X-ray bursts from 4U 1812-12 (2000)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Kuulkers, E., ...
During more than 3 years (August 1996-October 1999) monitoring of a 40x40 degree sky region around the Galactic Centre by the Wide Field Cameras on board BeppoSAX, a total of 8 type-I bursts have...
SAX J1810.8-2609: A New Hard X-ray Bursting Transient (2000)
Natalucci, L., Bazzano, A., Cocchi, M., Ubertini, P., Heise, J., Kuulkers, E., ...
The transient X-ray source SAX J1810.8-2609 was discovered on 1998, March 10 with the Wide Field Cameras on board the BeppoSAX satellite, while observing the Galactic Bulge in the 2-28 keV energy...
BeppoSAX observations of the nearby low-mass X-ray binary and fast transient SAX J1819.3-2525 (2000)
Kuulkers, E., Bazzano, A., Cornelisse, R., Cocchi, M., Heise, J., ...
SAX J1819.3-2525 is a nearby X-ray transient which exhibited a fast and large X-ray outburst on Sep. 15, 1999 (Smith et al. 1999). The Wide Field Cameras and the Narrow Field Instruments (NFI) on...
The orbital period of the recurrent X-ray transient in Terzan 6 (1999)
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...
A new bursting X-ray transient: SAX J1750.8-2900 (1999)
Natalucci, L., Cornelisse, R., Bazzano, A., Cocchi, M., Ubertini, P., Heise, J., ...
We have analysed in detail the discovery measurements of the X-ray burster SAX J1750.8-2900 by the Wide Field Cameras on board BeppoSAX in spring 1997, at a position ~1.2 degrees off the Galactic...
Discovery of type-I X-ray bursts from GRS 1741.9-2853 (1999)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Muller, J. M., ...
For the first time X-ray bursts have been detected from a sky position consistent with the one of GRS 1741.9-2853, a GRANAT transient source located only ~10' from the Galactic Centre. A total of 3...
A new X-ray outburst in the globular cluster NGC 6440: SAX J1748.9-2021 (1999)
Verbunt, F., Strohmayer, T. E., Bazzano, A., Cocchi, M., Heise, J., ...
For the second time in 27 years a bright transient X-ray source has been detected coincident with the globular cluster NGC 6440. It was found to be active in August, 1998, with the Wide Field Camera...
Bursts from GS 1826-238: a clocked thermonuclear flashes generator (1999)
Ubertini, P., Bazzano, A., Cocchi, M., Natalucci, L., Heise, J., Muller, J. M., ...
The transient X-ray source GS 1826-238 was monitored during five different observing periods between August 1996 and October 1998 with the BeppoSAX Wide Field Camera instrument in the framework of a...
SAX J1810.8-2609: an X-ray bursting transient (1999)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Muller, J. M., ...
We report on the BeppoSAX/WFC observation of a strong type-I X-ray burst from the recently discovered transient source SAX J1810.8-2609. The observed event showed evidence of photospheric radius...
Long term BeppoSAX-WFC monitoring of GRS 1758-258 (1999)
Cocchi, M., Smith, M. J. S., Muller, J. M., Bazzano, A., Natalucci, L., Ubertini, P., ...
Following a series of deep observations of the Galactic Bulge region performed with the Wide Field Cameras on board BeppoSAX, it has been possible to study throughout a long time period a number of...
X-ray bursts from 1RXS J170930.2-263927 = XTE J1709-267 (1998)
Cocchi, M., Bazzano, A., Natalucci, L., Ubertini, P., Heise, J., Muller, J. M., ...
We report evidence of type-I X-ray bursting activity from the transient 1RXS J170930.2-263927 when it was in outburst early 1997. This identifies the source as a probable low-mass X-ray binary...
Heise, J., Muller, J. M., Bazzano, A., Cocchi, M., Natalucci, L., ...
We report the discovery with BeppoSAX-WFC of two new X-ray sources that were only seen during bursts: SAX J1753.5-2349 and SAX J1806.5-2215. For both sources, no steady emission was detected above an...
Discovery of the X-ray transient SAX J1808.4-3658, a likely low mass X-ray binary (1998)
Heise, J., Muller, J. M., Bazzano, A., Cocchi, M., Natalucci, L., ...
We report the discovery of a fairly bright transient during observations with the Wide Field Cameras on board the BeppoSAX satellite in September 1996. It was detected at a peak intensity of 0.1 Crab...
Detection of X-ray bursts in the globular cluster NGC 6652 (1997)
Verbunt, F., Heise, J., Muller, J. M., Bazzano, A., Cocchi, M., ...
Two type I X-ray bursts were detected from a position consistent with the transient X-ray source in NGC 6652 with the Wide Field Camera of the BeppoSAX satellite, strongly suggesting that this...