Observational evidence for a correlation between peak-luminosities and beaming in GRBs
Astrophysics
2009-11-10 v1
Abstract
We calculate the unseen-but-true GRB-event rate from a current flux-limited sample of 33 GRBs with individually measured redshifts. We consider a GRB-event rate which is proportional to the star-formation rate, in view of the GRB-SNe association in SN1998bw and GRB030329. By fitting a log-normal distribution of GRB peak-luminosities, we find a ratio of about 450 for the true-to-observed GRB-event rates. This provides an independent derivation of the GRB-beaming factor of about 500 obtained by Frail et al. (2001) from sources with standard GRB-energies. We discuss applications to GRB980425.
Keywords
Cite
@article{arxiv.astro-ph/0307058,
title = {Observational evidence for a correlation between peak-luminosities and beaming in GRBs},
author = {Maurice H. P. M. van Putten and Tania Regimbau},
journal= {arXiv preprint arXiv:astro-ph/0307058},
year = {2009}
}
Comments
to appear in ApJ Lett