Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-10
Astron.Astrophys. 403 (2003) 443-448
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, forthcoming in Astron.Astrophys
Scientific paper
10.1051/0004-6361:20030328
The gamma-ray bursts detected by the BATSE instrument may be separated into "short", "intermediate" and "long" subgroups. Previous statistical tests found an anisotropic sky-distribution on large angular scales for the intermediate subgroup, and probably also for the short subgroup. In this article the description and the results of a further statistical test - namely the nearest neighbour analysis - are given. Surprisingly, this test gives an anisotropy for the long subgroup on small angular scales. The discussion of this result suggests that this anisotropy may be real.
Mészáros Attila
Stocek J.
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