Directional Anisotropy of Swift Gamma-Ray Bursts

TL;DR

This paper investigates the celestial distribution of Swift gamma-ray bursts, revealing anisotropy in the intermediate class while confirming isotropy for short and long bursts, using Monte-Carlo simulations.

Contribution

It identifies anisotropic distribution in the intermediate GRB class, providing new insights into their spatial properties compared to other classes.

Findings

Anisotropy found in intermediate GRBs

Short and long GRBs are isotropically distributed

Monte-Carlo simulations support the anisotropy results

Abstract

Swift satellite measurements contributed substantially to the gamma-ray burst (GRB) redshift observations through fast slewing to the source of the GRBs. Still, a large number of bursts are without redshift. We study the celestial distribution of bursts with various methods and compare them to a random catalog using Monte-Carlo simulations. We find an anisotropy in the distribution of the intermediate class of bursts and find that the short and long population are distributed isotropically.