Viewing Angle and Environment Effects in Gamma‐Ray Bursts: Sources of Afterglow Diversity

We discuss the afterglows from the evolution of both spherical and anisotropic reballs 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 di er widely among themselves, depending on the angular anisotropy of the reball and the properties of the environment. They may be entirely absent or may be detected without a corresponding c-ray event. A tabulation of di erent representative light curves is presented, covering a wide range of behaviors that resemble what is currently observed in the c-ray bursts (GRBs) GRB 970228, GRB 970508, and other objects.

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