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Session 33 - Gamma-ray Burst Counterparts and Afterglows.
Topical, Oral session, Tuesday, June 09
Friars,
The discovery of X-ray afterglows of Gamma-Ray Bursts (GRB) with the BeppoSAX satellite has renewed interest for the GRB phenomenon. In the cases an X-ray afteglow has been found, it is now possible to correlate the GRB properties with those of their afterglows. With BeppoSAX we already have a small sample of GRBs promptly observed with the Narrow Field Instruments. From most of them, probably from all GRBs precisely localized, an afterglow source was discovered in the 2-10 keV energy band. For each of these sources, the time decline was measured and, in some cases, also their energy spectrum was determined. I will report on the main properties of corresponding GRBs, mainly spectral evolution and energy distribution in different energy ranges, and correlate these properties with those of the afterglow sources.
