Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-08-16
Mon.Not.Roy.Astron.Soc. 328 (2001) 283
Astronomy and Astrophysics
Astrophysics
8 pages, 11 figures, to appear in MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04888.x
We have applied two different automatic classifier algorithms to the BATSE Current GRB Catalog data and we obtain three different classes of GRBs. Our results confirm the existence of a third, intermediate class of GRBs, with mean duration \sim 25-50 s, as deduced from a cluster analysis and from a neural network algorithm. Our analyses imply longer durations than those found by Mukherjee et al. (1998) and Horvath (1998), whose intermediate class had durations \sim 2-10 s. 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
Balastegui Andreu
Canal Ramon
Ruiz-Lapuente Pilar
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