Identification of two classes of gamma-ray bursts

Details Identification of two classes of gamma-ray bursts Identification of two classes of gamma-ray bursts

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413l.101k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 413, no. 2, p. L101-L104.

Astronomy and Astrophysics

Astrophysics

792

Astronomical Catalogs, Gamma Ray Bursts, Gamma Ray Observatory, Frequency Distribution, Spatial Distribution, Transient Response

Scientific paper

We have studied the duration distribution of the gamma-ray bursts of the first BATSE catalog. We find a bimodality in the distribution, which separates GRBs into two classes: short events (less than 2 s) and longer ones (more than 2 s). Both sets are distributed isotropically and inhomogeneously in the sky. We find that their durations are anticorrelated with their spectral hardness ratios: short GRBs are predominantly harder, and longer ones tend to be softer. Our results provide a first GRB classification scheme based on a combination of the GRB temporal and spectral properties.

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