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Session 33 - Gamma-ray Burst Counterparts and Afterglows.
Topical, Oral session, Tuesday, June 09

[33.05] Are Gamma-Ray Burst Properties related to those of theirX-ray Afterglows?

F. Frontera (Physics Dept, U. Ferrara, Italy and Ist. TESRE, CNR, Bologna, Italy)

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.

Program listing for Tuesday