Identification of two classes of gamma-ray bursts
C. KouveliotouUniversities Space Research Association; NASA, Marshall Space Flight Center Huntsville, AL, United StatesCharles A. MeeganNASA Marshall Space Flight Center Huntsville, AL United StatesG. J. FishmanNASA Marshall Space Flight Center Huntsville, AL United StatesNarayana P. BhatNASA Marshall Space Flight Center Huntsville, AL United StatesM. S. BriggsNASA Marshall Space Flight Center Huntsville, AL United StatesT. M. KoshutNASA Marshall Space Flight Center Huntsville, AL United StatesW. S. PačiesasNASA Marshall Space Flight Center Huntsville, AL United StatesGeoffrey N. PendletonAlabama Univ. Huntsville, United States
1993en
ABI
Annotatsiya
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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