Observational Evidence for a Correlation between Peak Luminosities and Beaming in Gamma-Ray Bursts | Zendy

Maurice H. P. M. van Putten | Zendy; T. Regimbau | Zendy

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Observational Evidence for a Correlation between Peak Luminosities and Beaming in Gamma-Ray Bursts

Author(s) -

Maurice H. P. M. van Putten,

T. Regimbau

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/378146

Subject(s) - gamma ray burst , astrophysics , physics , redshift , supernova , event (particle physics) , astronomy , galaxy

to appear in ApJ LettWe 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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