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9 papers · 2 filters
Discovery of a Transient Absorption Edge in the X-ray Spectrum of GRB 990705
L. Amati, F. Frontera, M. Vietri +18
We report the discovery of a transient equivalent hydrogen column density with an absorption edge at ~3.8 kiloelectron volts in the spectrum of the prompt x-ray emission of gamma-r…
The Steady Spin Down Rate of 4U 1907+09
A. Baykal, C. Inam, M. A. Alpar +2
Using X-ray data from the Rossi X-Ray Timing Explorer (RXTE), we report the pulse timing results of the accretion powered high mass X-ray binary (HMXRB) pulsar 4U 1907+09 covering…
Discovery of a redshifted Iron K-line in the X-ray afterglow of GRB 000214
L. A. Antonelli, L. Piro, M. Vietri +13
We report the detection (3 sigma significance level) of a strong iron emission line in the X-ray spectrum of the afterglow of GRB 000214 (``Valentine's Day Burst'') observed by Bep…
Wide band observations of the new X-ray burster SAX J1747.0-2853 during the March 1998 outburst
L. Natalucci, A. Bazzano, M. Cocchi +4
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…
X-ray afterglow detection of the short gamma-ray burst 991014
J. J. M. in 't Zand, L. Kuiper, L. Amati +14
GRB 991014 is one of the shortest gamma-ray bursts detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. The duration is 9.6 sec in 2-28 keV a…
X-ray and optical follow-up observations of the August 1998 X-ray transient in NGC6440
F. Verbunt, M. H. van Kerkwijk, J. J. M. in 't Zand +1
The BeppoSAX Wide Field Cameras detected a transient in NGC6440 on 1998 Aug 22. ROSAT did not detect this source on 1998 Sep 8, indicating that the X-ray flux had decreased by a fa…
GRB990510: on the possibility of a beamed X-ray afterglow
E. Kuulkers, L. A. Antonelli, L. Kuiper +11
We discuss the prompt emission of the gamma-ray burst (GRB) 990510 and its subsequent X-ray afterglow from 8.0 to 44.3 hrs after the prompt emission, using observations with the Ga…
Prompt and afterglow emission from the X-ray rich GRB981226 observed with BeppoSAX
F. Frontera, L. A. Antonelli, L. Amati +20
We discuss observations of the prompt X and gamma-ray emission and X-ray afterglow from GRB981226. This event has the weakest gamma-ray peak flux detected with the Gamma-Ray Burst…
SAX J1810.8-2609: A New Hard X-ray Bursting Transient
L. Natalucci, A. Bazzano, M. Cocchi +5
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…