%0 Journal Article
%T Gamma Ray Burst Beaming Constraints from Afterglow Light Curves: GRB 970508
%A James E. Rhoads
%J Physics
%D 1999
%I arXiv
%R 10.1051/aas:1999343
%X 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 10^{49} ergs to power the afterglow alone.
%U http://arxiv.org/abs/astro-ph/9903400v1