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On burning regimes and long duration X-ray bursts
L. Keek, J. J. M. in 't Zand
Hydrogen and helium accreted onto a neutron star undergo thermonuclear burning. Explosive burning is observed as a type I X-ray burst. We describe the different burning regimes and…
Restless quiescence: thermonuclear flashes between transient X-ray outbursts
E. Kuulkers, J. J. M. in 't Zand, J. -P. Lasota
For thermonuclear flashes to occur on neutron-star surfaces, fuel must have been accreted from a donor star. However, sometimes flashes are seen from transient binary systems when…
An X-ray and optical study of the ultracompact X-ray binary A1246-58
J. J. M. in 't Zand, C. G. Bassa, P. G. Jonker +4
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…
Prompt and Afterglow Emission Properties of Gamma-Ray Bursts with Spectroscopically Identified Supernovae
Y. Kaneko, E. Ramirez-Ruiz, J. Granot +8
We present a detailed spectral analysis of the prompt and afterglow emission of four nearby long-soft gamma-ray bursts (GRBs 980425, 030329, 031203, and 060218) that were spectrosc…
On the nature of two low M-dot X-ray bursters: 1RXS J170854.4-321857 and 1RXS J171824.2-402934
J. J. M. in 't Zand, R. Cornelisse, M. Mendez
We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single X-ray bursts had bee…
Bursts, eclipses, dips and a refined position for the luminous low-mass X-ray binary in the globular cluster Terzan 6
J. J. M. in 't Zand, F. Hulleman, C. B. Markwardt +6
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-opp…
The dark burst 010214 with BeppoSAX: possible variable absorption and jet X-ray emission
C. Guidorzi, F. Frontera, E. Montanari +12
We report on the prompt and afterglow emission observations of the dark burst GRB010214 with BeppoSAX. The prompt emission shows possible evidence of variable absorption from N_H =…
Photospheric radius expansion X-ray bursts as standard candles
E. Kuulkers, P. R. den Hartog, J. J. M. in 't Zand +3
We examined the maximum bolometric peak luminosities during type I X-ray bursts from the persistent or transient luminous X-ray sources in globular clusters. We show that for about…
Chandra follow-up of bursters with low persistent emission
R. Cornelisse, F. Verbunt, J. J. M. in 't Zand +2
We report on Chandra ACIS-S observations of five type I X-ray bursters with low persistent emission: SAX J1324.5-6313, SAX J1752.3-3128, SAX J1753.5-2349, SAX J1806.5-2215 and SAX…
BeppoSAX Wide Field Cameras observations of six type I X-ray bursters
R. Cornelisse, F. Verbunt, J. J. M. in 't Zand +7
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 w…
Discovery of a Second Millisecond Accreting Pulsar: XTE J1751-305
C. B. Markwardt, J. H. Swank, T. E. Strohmayer +2
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…
A Relativistic Fe K-alpha Emission Line in the Intermediate Luminosity BeppoSAX Spectrum of the Galactic Microquasar V4641 Sgr
J. M. Miller, A. C. Fabian, J. J. M. in 't Zand +4
Broad Fe K-alpha emission lines have recently been reported in a number of Galactic black holes. Such lines are useful accretion flow diagnostics because they may be produced at th…
The nature of the X-ray transient SAX J1711.6-3808
J. J. M. in 't Zand, C. B. Markwardt, A. Bazzano +8
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…
Intrinsic spectra and energetics of BeppoSAX Gamma-Ray Bursts with known redshifts
L. Amati, F. Frontera, M. Tavani +13
We present the main results of a study of spectral and energetics properties of twelve gamma-ray bursts (GRBs) with redshift estimates. All GRBs in our sample were detected by Bepp…
Broad-band X-ray measurements of the black hole candidate XTE J1908+094
J. J. M. in 't Zand, J. M. Miller, T. Oosterbroek +1
XTE J1908+094 is an X-ray transient that went into outburst in February 2002. After two months it reached a 2-250 keV peak flux of 1 to 2 X 10-8 erg/s/cm2. Circumstantial evidence…
Discovery of the neutron star nature of SLX 1737-282
J. J. M. in 't Zand, F. Verbunt, E. Kuulkers +7
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 rev…
Discovery of Millisecond Variability in the Neutron-Star X-Ray Transient SAX J1750.8-2900
P. Kaaret, J. J. M. in 't Zand, J. Heise +1
We report the discovery of millisecond oscillations in the X-ray emission from the X-ray transient SAX J1750.8-2900. Millisecond quasiperiodic oscillations (kHz QPOs) were present…
Spectral Characteristics of X-ray Flashes compared to Gamma-Ray Bursts
R. M. Kippen, P. M. Woods, J. Heise +3
X-ray flashes (XRFs) are a new type of fast transient source observed with the BeppoSAX Wide Field Cameras (WFC) at a rate of about four per year. Apart from their large fraction o…
The bright Gamma-Ray Burst of February 10, 2000: a case study of an optically dark GRB
L. Piro, D. A. Frail, J. Gorosabel +18
The gamma-ray burst GRB000210 had the highest gamma-ray peak flux of any event localized by BeppoSAX as yet but it did not have a detected optical afterglow. It is therefore one of…
A four-hours long burst from Serpens X-1
R. Cornelisse, E. Kuulkers, J. J. M. in 't Zand +2
During a serendipitous observation of the BeppoSAX Wide Field Cameras, a very long Type I X-ray burst was observed from the low mass X-ray binary Serpens X-1. The burst lasted for…
A half-a-day long thermonuclear X-ray burst from KS 1731-260
E. Kuulkers, J. J. M. in 't Zand, M. H. van Kerkwijk +7
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…
X-ray flashes and X-ray rich Gamma Ray Bursts
John Heise, Jean in 't Zand, Marc Kippen +1
X-ray flashes are detected in the Wide Field Cameras on BeppoSAX in the energy range 2-25 keV as bright X-ray sources lasting of the order of minutes, but remaining undetected in t…
Identification of the optical and quiescent counterparts to the bright X-ray transient in NGC 6440
J. J. M. in 't Zand, M. H. van Kerkwijk, D. Pooley +3
After 3 years of quiescence, the globular cluster NGC 6440 exhibited a bright transient X-ray source turning on in August 2001, as noted with the RXTE All-Sky Monitor. We carried o…
Discovery of a 1247 s pulsar in the Be X-ray binary SAX J2239.3+6116
J. J. M. in 't Zand, J. Swank, R. H. D. Corbet +1
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, yi…