Preliminary investigation to test extragalactic hypothesis for gamma-ray bursts.

Mathematics – Logic

Scientific paper

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Gamma-Ray Bursts: Origin

Scientific paper

Recent observations of CGRO satellite challenged the almost universally accepted galactic origin of gamma-ray bursts and have revived the extragalactic, cosmological models. This hypothesis should imply some variations of the morphological and energetic characteristics of the weaker events to which the authers think the farthest ones might belong. The existence of such variation due to the cosmological red-shift should be tested. In this paper the authors examine the possible correlations between temporal morphology of the gamma-ray bursts, peak intensity and photon energy spectra when the red-shift effects do not yet occur. They examine the peak intensities and the energy spectral-hardness distribution versus rise times for events observed by previous space missions, with a log N-log S shape free of cosmological effects. The results of this analysis suggest that a wide range of values of the temporal and spectral characteristic parameters is an intrinsic property of the sources.

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