The Average Intensity and Spectral Evolution of BATSE Cosmic Gamma-Ray Bursts

Details The Average Intensity and Spectral Evolution of BATSE Cosmic Gamma-Ray Bursts The Average Intensity and Spectral Evolution of BATSE Cosmic Gamma-Ray Bursts

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459..570m&link_type=abstract

Astrophysical Journal v.459, p.570

Astronomy and Astrophysics

Astronomy

55

Gamma Rays: Bursts

Scientific paper

Statistical studies of BATSE gamma-ray bursts are presented: we average the time profiles, aligning the events at their highest peaks. Using the time histories in different energy channels, we summarize the general features of the average intensity and spectral evolution of gamma-ray bursts (GRBs) and compare the average evolution of bright and dim events. While no differences are found between the average intensity histories, the average hardness ratio histories demonstrate a hardness/brightness correlation. The observed lack of differences between the intensity histories of bright and dim bursts is incompatible with cosmological time dilation effects predicted by simple cosmological models. The combined results of no intensity history difference but a hardness history difference between bright and dim bursts places constraints on galactic models for the origin of GRBs

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