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Luminosities, space densities and redshift distributions of gamma-ray bursts

Schmidt, Maarten (2000) Luminosities, space densities and redshift distributions of gamma-ray bursts. In: Gamma Ray Bursts: 5th Huntsville Symposium, Huntsville, AL, 18-22 October 1999. American Institute of Physics Conference Proceedings. No.526. American Institute of Physics , Melville, NY, pp. 58-62. ISBN 1-56396-947-5. http://resolver.caltech.edu/CaltechAUTHORS:SCHMaipcp00a

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Abstract

We use the BD2 sample of gamma-ray bursts (GRBs) based on 5.9 years of BATSE DISCLA data with a variety of models of the luminosity function to derive characteristic GRB luminosities, space densities and redshift distributions. Previously published results for an open universe and modest density evolution of the GRBs showed characteristic peak luminosities around 5×10^51 ergs s^–1 in the 50–300 keV band if the emission is isotropic, and local space densities around 0.2 Gpc^–3 y^–1. In this paper, we illustrate for several luminosity function models the predicted distributions of peak flux, luminosity and redshifts. We use the luminosity function models also to address the connection between supernovae and GRB. If all supernovae of type Ib/c harbor a GRB, the beaming fraction would have to be in the range 10^–5–10*–3.5. We find that GRB 980425, if correctly identified with SN 1998bw, has to be part of a population different from that of the bulk of GRBs.


Item Type:Book Section
Additional Information:©2000 American Institute of Physics. Issue Date: September 8, 2000.
Record Number:CaltechAUTHORS:SCHMaipcp00a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SCHMaipcp00a
Alternative URL:http://dx.doi.org/10.1063/1.1361507
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10019
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:05 Apr 2008
Last Modified:26 Dec 2012 09:56

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