Gamma Ray Burst Beaming Constraints from Afterglow Light Curves: GRB 970508
James E. Rhoads
Abstract
The beaming angle (zeta) is the main uncertainty in gamma ray burst energy requirements today. We summarize predictions for the light curves of beamed bursts, and model the R band light curve of GRB 970508 to derive zeta > 30 degrees. This yields an irreducible minimum energy requirement of 3.4 times 1049 ergs to power the afterglow alone.
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