Gamma-Ray Burst Spectral Evolution Through Crosscorrelations of Discriminator Light Curves

Details Gamma-Ray Burst Spectral Evolution Through Crosscorrelations of Discriminator Light Curves Gamma-Ray Burst Spectral Evolution Through Crosscorrelations of Discriminator Light Curves

1997-04-21

arxiv.org/abs/astro-ph/9704206v1

Astronomy and Astrophysics

Astrophysics

17 pages, AASTeX 4.0, 9 figures, to appear in Ap.J., vol 486

Scientific paper

10.1086/304566

Gamma-ray burst spectra usually show hard-to-soft evolution within intensity spikes and from spike to spike. The techniques used to study spectral evolution often lack sufficient temporal resolution to determine the nature of this evolution. By comparing the auto- and crosscorrelations between the time histories of the BATSE Large Area Detector discriminator rates I have characterized the spectral evolution of a sample of 209 bursts. I find that hard-to-soft evolution is ubiquitous, and only ~10% of the bursts show clear soft-to-hard evolution.

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