Evidence for a Fast Decline in the Progenitor Population of Gamma Ray Bursts and the Nature of their Origin

Abstract

We show that the source population of long gamma-ray bursts (GRBs) has declined by at least a factor of 12 (at the 90% confidence level) since the early stages of the Universe ($z\sim 2-3$). This result has been obtained using the combined BATSE and \it Ulysses \rm GRB brightness distribution and the detection of four GRBs with known redshifts brighter than 10${}^{52}$ erg s${}^{-1}$ in the 50 - 300 keV range at their peak. The data indicate that the decline of the GRB source population is as fast as, or even faster than, the measured decline of the star formation rate. Models for the evolution of neutron star binaries predict a significantly larger number of apparently bright GRBs than observed. Thus our results give independent support to the hypernova model, which naturally explains the fast decline in the progenitor population.

7 pages, 6 figures, submitted to ApJ, added references

References in corpus (5)

• The Signature of Supernova Ejecta Measured in the X-ray Afterglow of Gamma-Ray Burst 011211
• Study of Gamma Ray Burst Binary Progenitors
• The optical afterglow of GRB 000911: evidence for an associated supernova?
• The Redshift of the Optical Transient Associated with GRB 010222
• The Decline of the Source Population of Gamma-Ray Bursts and Their Luminosity Function

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