Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.2015a&link_type=abstract
"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an
Physics
Scientific paper
At the middle of December 2006 the volume of GRB set with known redshift consisted of approximately 100 bursts, mostly localized by SWIFT. In this article the GRB redshift distribution is presented and its shape is discussed. Analysis of single peak approximation of GRB redshift distribution, have shown that it has very heavy tail which consists of 37% of volume set. As example of real uniform set the shape of normalized z-distribution for first 604 QSO from 2QZ_6QZ catalog and for some SNIa are analyzed and it is shown that 2-9% events in dependence of amount of sampling must be in the tails of distributions above 3σ levels. So, this fact allows to make conclusion that GRB sources set is not uniform and at least two subgroups could be separated in GRB redshift distribution at 95% confidence level which limited by volume of GRB set with known redshift. This conclusion confirmed by analysis of chi-square for two-peaks function approximation, which gives more significant result than one-peak fit (95% and 70% correspondingly).
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