Gross spectral differences between bright and very bright gamma-ray bursts

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Gamma-Ray Sources, Gamma-Ray Bursts, Spectroscopy And Spectrophotometry

Scientific paper

We consider a sample of 77 GRBs recorded by Phebus on GRANAT and the GRB detector on Ulysses in four years of operation. The comparison of the peak counts measured by these two instruments clearly shows the existence of a correlation between the intensities and the spectral hardnesses of these bursts. As sources homogeneously distributed in an Euclidean space should not exhibit any Hardness-Intensity correlation, we conclude that our sample is made of bursters which are not distributed homogeneously in space. This conclusion applies to bright (nearby?) bursters with peak flux above 8 ph cm-2 s-1. We also note that, while non-homogeneous, our GRB sample exhibits the canonical value =0.5, confirming (if needed) that the test V/Vmax is efficient to reject homogeneity but not to prove it.

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