Observational evidence for a correlation between peak-luminosities and beaming in grbs - INSPIRE

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Observational evidence for a correlation between peak-luminosities and beaming in grbs

Jul, 2003

Published in:

Astrophys.J.Lett. 593 (2003) L15-L18

e-Print:

astro-ph/0307058 [astro-ph]

DOI:

10.1086/378146

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Abstract: (arXiv)

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.

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