Probing the Isotropy in the Sky Distribution of the Gamma-Ray Bursts

TL;DR

This paper evaluates the randomness of gamma-ray burst distributions in the sky, finding that intermediate bursts show signs of anisotropy using various statistical tests.

Contribution

It systematically surveys multiple statistical methods to test isotropy in gamma-ray burst distributions, highlighting anisotropy in intermediate subclasses.

Findings

Intermediate gamma-ray bursts are distributed anisotropically.

Multiple statistical tests confirm deviations from randomness.

The study provides a comprehensive analysis of sky distribution patterns.

Abstract

The statistical tests - done by the authors - are surveyed, which verify the null-hypothesis of the intrinsic randomness in the angular distribution of gamma-ray bursts collected at BATSE Catalog. The tests use the counts-in-cells method, an analysis of spherical harmonics, a test based on the two-point correlation function and a method based on multiscale methods. The tests suggest that the intermediate subclass of gamma-ray bursts are distributed anisotropically.