Astron. Astrophys. 326, 29-33 (1997)

Cosmological parametrization of gamma ray burst intensity distribution

Eric V. Linder

Imperial College, Prince Consort Road, London SW7 2BZ, England (el@ic.ac.uk)

Received 2 April 1996 / Accepted 30 September 1996

Abstract

Using three parametrizations of the gamma ray burst count data comparison is made to cosmological source models. While simple models can fit and faint end slope constraints, the addition of a logarithmic count range variable describing the curvature of the counts shows that models with no evolution or evolution power law in redshift with index less than 10 fail to satisfy simultaneously all three descriptors of the burst data. The cosmological source density that would be required for a fit is illustrated.

Key words: gamma rays: bursts cosmology: theory

Contents

• 1. Introduction
• 2. Count distribution
  • 2.1. Source and detector variation
  • 2.2. properties
• 3. Cosmological parametrization
• 4. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998
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