Anisotropy in the angular distribution of the long gamma-ray bursts?

Details Anisotropy in the angular distribution of the long gamma-ray bursts? Anisotropy in the angular distribution of the long gamma-ray bursts?

2003-03-10

arxiv.org/abs/astro-ph/0303207v1

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.

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