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Identification of two classes of gamma-ray bursts
The Astrophysical Journal1993Vol. 413, pp. L101–L101
Citations Over TimeTop 1% of 1993 papers
C. Kouveliotou, Charles A. Meegan, G. J. Fishman, Narayana P. Bhat, M. S. Briggs, T. M. Koshut, W. S. Pačiesas, Geoffrey N. Pendleton
Abstract
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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