2001/08/16 by A. Balastegui, Andreu Balastegui, Pilar Ruiz-Lapuente +3
Physics and Astronomy · #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2001.04888.x
published as Mon.Not.Roy.Astron.Soc. 328 (2001) 283 · 8 pages, 11 figures, to appear in MNRAS
arxiv created 2001/08/16 · openalex publication_date 2001/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have applied two different automatic classifier algorithms to the BATSE Current GRB Catalog data and we obtain three different classes of gamma-ray bursts (GRBs). Our results confirm the existence of a third, intermediate class of GRBs, with mean duration ∼, as deduced from a cluster analysis and from a neural network algorithm. Our analyses imply longer durations than those found by Mukherjee et al. and Horváth, whose intermediate class had durations ∼. From the neural network analysis no difference in hardness between the two longest classes is found, and from both methods we find that the intermediate-duration class constitutes the most homogeneous sample of GRBs in its space distribution, while the longest-duration class constitutes the most inhomogeneous one with , being thus the deepest population of GRBs with . The trend previously found in long bursts, of spatial inhomogeneity increasing with hardness, only holds for this new longest-duration class.