Time dependent photoionization opacities in dense Gamma-Ray Burst environments

Details Time dependent photoionization opacities in dense Gamma-Ray Burst environments Time dependent photoionization opacities in dense Gamma-Ray Burst environments

2001-06-12

arxiv.org/abs/astro-ph/0106202v1

Astrophys.J. 580 (2002) 261-277

Astronomy and Astrophysics

Astrophysics

5 pages, 4 postscript figures, MNRAS in press

Scientific paper

10.1046/j.1365-8711.2001.04735.x

The recent detection of a transient absorption feature in the X-ray prompt emission of GRB 990705 showed the importance of such observations in the understanding of gamma-ray bursts and their progenitors. We investigate the time dependence of photoionization edges during the prompt emission of bursts in different environments. We show that their variability can be used to infer the density and geometry of the surrounding medium, giving important clues to unveil the nature of the burst progenitor.

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