New Statistical Results on the Angular Distribution of Gamma-Ray Bursts

TL;DR

This paper applies multiple advanced statistical tests to analyze the angular distribution of gamma-ray bursts in the BATSE catalog, revealing non-random patterns especially in certain subclasses, which could have implications for understanding their origins.

Contribution

The study introduces new statistical tests for analyzing gamma-ray burst distributions and demonstrates their effectiveness in detecting non-randomness in specific subclasses.

Findings

Long1 and Long2 classes are randomly distributed.

Intermediate subclass shows non-random distribution.

New tests detect non-randomness in Short subclass.

Abstract

We presented the results of several statistical tests of the randomness in the angular sky-distribution of gamma-ray bursts in BATSE Catalog. Thirteen different tests were presented based on Voronoi tesselation, Minimal spanning tree and Multifractal spectrum for five classes (short1, short2, intermediate, long1, long2) of gamma-ray bursts, separately. The long1 and long2 classes are distributed randomly. The intermediate subclass, in accordance with the earlier results of the authors, is distributed non-randomly. Concerning the short subclass earlier statistical tests also suggested some departure from the random distribution, but not on a high enough confidence level. The new tests presented in this article suggest also non-randomness here.