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      The Cosmological Signatures and Flux Distribution of Gamma-Ray Bursts with a Broad Luminosity Distribution

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          Abstract

          The cosmological expansion cannot produce the reported correlations of the gamma-ray burst timescale and spectral energy with peak flux if the burst model reproduces the BATSE 3B peak-flux distribution for a non-evolving burst source density. Power law luminosity distribution models proportional to L^{-beta} produce acceptables fits to the data for most values of the spectral parameters when beta < 1.6. In this model, gamma-ray bursts of a given peak flux have a distribution of redshifts, with a maximum redshift of > 3 for peak fluxes near the BATSE threshold, and with an average redshift of < 1 for all values of peak flux. The reported correlations of the burst timescale and the spectral energy with peak flux are systematically 1 standard deviation above the monoluminous model and 1.5 to 2 standard deviation above the power-law luminosity model. These results suggest that an intrinsic correlation of burst timescale and spectral energy with luminosity is present.

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          Author and article information

          Journal
          10 July 1997
          1997-08-16
          Article
          10.1086/304585
          astro-ph/9707122
          fc894f4d-aef6-453d-9311-23a99f393ac9
          History
          Custom metadata
          38 pages with embedded figures. To appear in ApJ on Sept. 20, 1997. Minor errors corrected August 16, 1997
          astro-ph

          General astrophysics
          General astrophysics

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