7 papers
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…
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…
Prompt and delayed emission properties of Gamma-Ray Bursts observed with BeppoSAX
F. Frontera, L. Amati, E. Costa +14
We investigated the spectral evolution in the 2--700 keV energy band of Gamma-Ray Bursts (GRBs) detected by the Gamma-Ray Burst Monitor (GRBM) and localized with the Wide Field Cam…
BeppoSAX Observations of GRB980425: Detection of the Prompt Event and Monitoring of the Error Box
E. Pian, L. Amati, L. A. Antonelli +25
We present BeppoSAX follow-up observations of GRB980425 obtained with the Narrow Field Instruments (NFI) in April, May, and November 1998. The first NFI observation has detected wi…
The X-ray afterglow of the Gamma-ray burst of May 8, 1997: spectral variability and possible evidence of an iron line
L. Piro, E. Costa, M. Feroci +11
We report the possible detection (99.3% of statistical significance) of redshifted Fe iron line emission in the X-ray afterglow of Gamma-ray burst GRB970508 observed by BeppoSAX. I…
Gamma-Ray Burst 980329 and its X-Ray Afterglow
J. J. M. in 't Zand, L. Amati, L. A. Antonelli +16
GRB 980329 is the brightest gamma-ray burst detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. With respect to its fluence (2.6 X 10**-5 er…