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Identification of two classes of gamma-ray bursts
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1993
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The study examined the duration distribution of gamma‑ray bursts in the first BATSE catalog. The analysis revealed a bimodal duration distribution separating GRBs into short (<2 s) and long (>2 s) classes, which are isotropically distributed and show an anticorrelation between duration and spectral hardness, providing a first classification scheme based on temporal and spectral properties. Published in The Astrophysical Journal, August 1993 (DOI 10.1086/186969).
view Abstract Citations (1679) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 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. 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. Publication: The Astrophysical Journal Pub Date: August 1993 DOI: 10.1086/186969 Bibcode: 1993ApJ...413L.101K Keywords: Astronomical Catalogs; Gamma Ray Bursts; Gamma Ray Observatory; Frequency Distribution; Spatial Distribution; Transient Response; Space Radiation; GAMMA RAYS: BURSTS full text sources ADS |