Publication Date:
2011-08-24
Description:
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.
Keywords:
SPACE RADIATION
Type:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 413; 2; p. L101-L104.
Format:
text
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