| Issue |
A&A
Volume 403, Number 2, May IV 2003
|
|
|---|---|---|
| Page(s) | 443 - 448 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20030328 | |
| 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: meszaros@mbox.cesnet.cz;jirsto@seznam.cz
Corresponding author: A. Mészáros, meszaros@mbox.cesnet.cz
Received:
15
March
2002
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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