Free Access
| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
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|---|---|---|
| Page(s) | 539 - 540 | |
| DOI | https://doi.org/10.1051/aas:1999343 | |
| Published online | 15 September 1999 | |
Astron. Astrophys. Suppl. Ser. 138, 539-540 (1999)
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.
Received:
24
December
1998
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