Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-25
Astrophys.J. 614 (2004) 301-308
Astronomy and Astrophysics
Astrophysics
22 pages, 6 figures, Accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/423335
We report observation results of the prompt X-- and $\gamma$--ray emission from GRB 000528. This event was detected with the Gamma-Ray Burst Monitor and one of the two Wide Field Cameras aboard the BeppoSAX satellite. The GRB was promptly followed on with the BeppoSAX Narrow Field Instruments and with ground optical and radio telescopes. The X-ray afterglow source was identified, but no optical or radio counterpart found. We report here results from the prompt and afterglow emission analysis. The main feature derived from spectral evolution of the prompt emission is a high hydrogen-equivalent column density with evidence of its decrease with time. We model this behavior in terms of a time-dependent photoionization of the local circum-burst medium, finding that a compact and dense environment is required by the data. We also find a fading of the late part of the 2--10 keV prompt emission which is consistent with afterglow emission. We discuss this result in the light of the external shock model scenario.
Amati Lorenzo
Costa Edgar
Feroci Marco
Frontera Filippo
Guidorzi Cristiano
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