Volume 403, Number 2, May IV 2003
|Page(s)||443 - 448|
|Section||Cosmology (including clusters of galaxies)|
|Published online||06 May 2003|
Anisotropy in the angular distribution of the long gamma-ray bursts?
Astronomical Institute of the Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic e-mail: firstname.lastname@example.org;email@example.com
Corresponding author: A. Mészáros, firstname.lastname@example.org
Accepted: 28 February 2003
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.
Key words: gamma-rays: bursts / cosmology: miscellaneous
© ESO, 2003
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