The luminosity and redshift distributions of short-duration GRBs

D Guetta, T Piran

Research output: Contribution to journalArticlepeer-review

109 Scopus citations

Abstract

Using the BATSE peak flux distribution we rederive the short GRBs luminosity function and compare it with the observed redshift distribution of long bursts. We show that both distributions are compatible with the assumption that short as well as long bursts follow the star formation rate. In this case the difference between the two observed distributions can be interpreted as arising mostly from differences in the detector's sensitivity to long and short bursts, while the local rate of short bursts is 0.1 h703 Gpc-3 yr-1. We also consider the possibility that short GRBs may be associated with binary neutron star mergers and estimate the effect of the merging time delay on the luminosity function and redshift distribution. We find that in this case the local rate of short GRBs is ∼0.8 h 703 Gpc-3 yr-1. Assuming that all binary merging systems lead to short GRBs, we find a typical jet opening angle of 1.6°.

Original languageEnglish
Pages (from-to)421-426
Number of pages6
JournalAstronomy and Astrophysics
Volume435
Issue number2
DOIs
StatePublished - May 2005
Externally publishedYes

Keywords

  • cosmology : observations
  • gamma rays : bursts

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