Gross Spectral Differences between Bright and Dim Gamma-Ray Bursts

Details Gross Spectral Differences between Bright and Dim Gamma-Ray Bursts Gross Spectral Differences between Bright and Dim Gamma-Ray Bursts

1994-08-15

arxiv.org/abs/astro-ph/9408049v1

Astrophys.J. 435 (1994) L133

Astronomy and Astrophysics

Astrophysics

in press: The Astrophysical Journal (Letters), 15 pages of Plain TEX version 3.0. Postscript text and figures available throug

Scientific paper

10.1086/187612

We find that dim gamma-ray bursts (GRBs) are softer than bright GRBs, as indicated on average by data from the Burst and Transient Source Experiment (BATSE) on board the Compton Gamma Ray Observatory. We show that this correlation is statistically significant with respect to variations due to random differences between GRBs. This effect is discernable using a variety of methods and data sets, including public domain data. We analyze several types of systematic errors and selection effects in the BATSE data and conclude that the observed effect is not dominated by any of them. We therefore assert that this dim/soft effect is a real property of GRBs. It is possible that this correlation is a consequence of the time dilation detected by Norris et al. (1994) and that this is additional evidence that burst sources are located at cosmological distances.

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