Abstract
We have studied the duration distribution of 222 Gamma Ray Bursts of the first BATSE catalog. We find a bimodality in the distribution, which separates GRBs into two classes: short events (<2 s) and longer ones (≳2 s). Both sets are distributed isotropically and inhomogeneously in the sky. We find that their duration are anti‐correlated 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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