Gamma-ray burst beaming constraints from afterglow light curves
Kitt Peak National Observatory, NOAO, P.O. Box 26732, Tucson, AZ 85726-6732, U.S.A.
Accepted: 29 April 1999
The beaming angle 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 . This yields an irreducible minimum energy requirement of ergs to power the afterglow alone.
Key words: gamma-ray: bursts
© European Southern Observatory (ESO), 1999