A Remarkable Angular Distribution of the Intermediate Subclass of Gamma-Ray Bursts
Abstract
In the article a test is developed, which allows to test the null-hypothesis of the intrinsic randomness in the angular distribution of gamma-ray bursts collected at the Current BATSE Catalog. The method is a modified version of the well-known counts-in-cells test, and fully eliminates the non-uniform sky-exposure function of BATSE instrument. Applying this method to the case of all gamma-ray bursts no intrinsic non-randomness is found. The test also did not find intrinsic non-randomnesses for the short and long gamma-ray bursts, respectively. On the other hand, using the method to the new intermediate subclass of gamma-ray bursts, the null-hypothesis of the intrinsic randomness for 181 intermediate gamma-ray bursts is rejected on the 96.4% confidence level. Taking 92 dimmer bursts from this subclass itself, we obtain the surprising result: This "dim" subclass of the intermediate subclass has an intrinsic non-randomness on the 99.3% confidence level. On the other hand, the 89 "bright" bursts show no intrinsic non-randomness.
Cite
@article{arxiv.astro-ph/0003284,
title = {A Remarkable Angular Distribution of the Intermediate Subclass of Gamma-Ray Bursts},
author = {A. Meszaros and Z. Bagoly and I. Horvath and L. G. Balazs and R. Vavrek},
journal= {arXiv preprint arXiv:astro-ph/0003284},
year = {2007}
}
Comments
14 pages, 2 figures, Accepted for publication in Astrophysical Journal, typo changes