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Identification of two classes of gamma-ray bursts
Kouveliotou, Chryssa; Meegan, Charles A.; Fishman, Gerald J.; Bhat, Narayana P.; Briggs, Michael S.; Koshut, Thomas M.; Paciesas, William S.; Pendleton, Geoffrey N.
AA(Universities Space Research Association; NASA, Marshall Space Flight Center, Huntsville, AL), AB(NASA, Marshall Space Flight Center, Huntsville, AL), AC(NASA, Marshall Space Flight Center, Huntsville, AL), AD(NASA, Marshall Space Flight Center, Huntsville, AL), AE(Alabama Univ., Huntsville, AL), AF(Alabama Univ., Huntsville, AL), AG(Alabama Univ., Huntsville, AL), AH(Alabama Univ., Huntsville, AL)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 413, no. 2, p. L101-L104. (ApJL Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Astronomical Catalogs, Gamma Ray Bursts, Gamma Ray Observatory, Frequency Distribution, Spatial Distribution, Transient Response
Bibliographic Code:


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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