An Upper Limit on the Luminosity of Cosmological GammaRay Bursts
Abstract
The Pioneer Venus Orbiter (PVO) log Nlog P distribution follows a 3/2 power law for over a factor of 30 in intensity, which is inconsistent with gammaray bursts from large redshifts. We develop log Nlog P models suitable for cosmological gammaray bursts. The PVO data are best fit with a standard candle peak luminosity of 2 x 1050 erg/sec with 3 x 104 events/yr within a Hubble distance. However, noncosmological models fit nearly as well (L_{0} much less than 1050). A luminosity of 1052 erg/sec fits at a 3 sigma level and is, therefore, a maximum upper limit allowed by the PVO data. This upper limit is roughly equal to other reported lower limits. The BATSE event rate combined with the PVO limits implies that evolution with epoch must be occurring.
 Publication:

American Institute of Physics Conference Series
 Pub Date:
 1992
 Bibcode:
 1992AIPC..265..108F
 Keywords:

 Cosmology;
 Gamma Ray Bursts;
 Gamma Ray Observatory;
 Luminosity;
 Spaceborne Astronomy;
 Distance;
 Pioneer Venus 1 Spacecraft;
 Red Shift;
 Spatial Distribution;
 Space Radiation