Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-29
Astronomy and Astrophysics
Astrophysics
24 pages, 12 figures. Article submitted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20053950
We present the X-ray afterglow catalog of BeppoSAX from the launch of the satellite to the end of the mission. Thirty-three X-ray afterglows were securely identified based on their fading behavior out of 39 observations. We have extracted the continuum parameters (decay index, spectral index, flux, absorption) for all available afterglows. We point out a possible correlation between the X-ray afterglow luminosity and the energy emitted during the prompt $\gamma$-ray event. We do not detect a significant jet signature within the afterglows, implying a lower limit on the beaming angle, neither a standard energy release when X-ray fluxes are corrected for beaming. Our data support the hypothesis that the burst should be surrounded by an interstellar medium rather than a wind environment, and that this environment should be dense. This may be explained by a termination shock located near the burst progenitor. We finally point out that some dark bursts may be explained by an intrinsic faintness of the event, while others may be strongly absorbed.
Amati Lorenzo
Antonelli Lucio Angelo
Costa Edgar
de Pasquale Massimiliano
Feroci Marco
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