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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…
The BeppoSAX HELLAS survey: on the nature of faint hard X-ray selected sources
F. Fiore, L. A. Antonelli, P. Ciliegi +8
The BeppoSAX 4.5-10 keV High Energy Large Area Survey has covered about 80 square degrees of sky down to a flux of F(5-10keV)~5E-14 cgs. Optical spectroscopic identification of abo…
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…
Optically dim counterparts of hard X-ray selected AGNs
R. Maiolino, M. Salvati, L. A. Antonelli +9
We present near-IR photometry and imaging observations of a small sample of sources identified in the BeppoSAX 5-10 keV survey (HELLAS) which resolves ~ 20-30% of the X-ray backgro…
BeppoSAX spectrum of GRB971214: evidence of a substantial energy output during afterglow
D. Dal Fiume, L. Amati, L. A. Antonelli +18
We report the X/gamma-ray spectrum of GRB971214 and of its afterglow. The afterglow was measured few hours after the main event and for an elapsed time of more than two days. The m…