Towards a Model for the Progenitors of Gamma-Ray Bursts

Details Towards a Model for the Progenitors of Gamma-Ray Bursts Towards a Model for the Progenitors of Gamma-Ray Bursts

1999-11-10

arxiv.org/abs/astro-ph/9911160v1

ApJ 538, 187 (2000)

Astronomy and Astrophysics

Astrophysics

13 pages; Submitted to ApJ

Scientific paper

10.1086/309120

We consider models for gamma-ray bursts in which a collimated jet expands either into a homogeneous medium or into a stellar wind environment, and calculate the expected afterglow temporal behavior. We show that (i) following a break and a faster decay, afterglows should exhibit a flattening, which may be detectable in both the radio and optical bands; (ii) Only observations at times much shorter than a day can clearly distinguish between a fireball interacting with a homogeneous medium and one interacting with a stellar wind. Using our results we demonstrate that constraints can be placed on progenitor models. In particular, existing data imply that while some long duration bursts may be produced by collapses of massive stars, it is almost certain that not all long duration bursts are produced by such progenitors.

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