The beaming angle ζm 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 ζm ≳ 30°. This yields an irreducible minimum energy requirement of 3.4 1049 ergs to power the afterglow alone.
- Gamma-ray: bursts
ASJC Scopus subject areas
- General Physics and Astronomy