Decay properties of the X-ray afterglows of Gamma-ray bursts

Details Decay properties of the X-ray afterglows of Gamma-ray bursts Decay properties of the X-ray afterglows of Gamma-ray bursts

2004-11-09

arxiv.org/abs/astro-ph/0411238v1

Astron.Astrophys. 430 (2005) 465-470

Astronomy and Astrophysics

Astrophysics

7 pages, 3 color figures and 1 B&W figure. Accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20042031

We present a set of seventeen Gamma-Ray Bursts (GRBs) with known redshifts and X-ray afterglow emission. We apply cosmological corrections in order to compare their fluxes normalized at a redshift of 1. Two classes of GRB can be defined using their X-ray afterglow light curves. We show that the brightest afterglows seem to decay faster than the dimer ones. We also point out evidences for a possible flux limit of the X-ray afterglow depending on the time elapsed since the burst. We try to interpret these observations in the framework of the canonical fireball model of GRB afterglow emission.

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