Viewing Angle and Environment Effects in GRB: Sources of Afterglow Diversity

Details Viewing Angle and Environment Effects in GRB: Sources of Afterglow Diversity Viewing Angle and Environment Effects in GRB: Sources of Afterglow Diversity

1997-09-26

arxiv.org/abs/astro-ph/9709273v2

Astrophys.J. 499 (1998) 301

Astronomy and Astrophysics

Astrophysics

Revised version, original subm to Ap.J. 9/26/97, latex file (uses aaspp4), 17 pages. The qualitative behavior remains the same

Scientific paper

10.1086/305635

We discuss the afterglows from the evolution of both spherical and anisotropic fireballs decelerating in an inhomogeneous external medium. We consider both the radiative and adiabatic evolution regimes, and analyze the physical conditions under which these regimes can be used. Afterglows may be expected to differ widely among themselves, depending on the angular anisotropy of the fireball and the properties of the environment. They may be entirely absent, or may be detected without a corresponding $\gamma$-ray event. A tabulation of different representative light curves is presented, covering a wide range of behaviors that resemble what is currently observed in GRB 970228, GRB 970508 and other objects.

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