Anisotropy in the angular distribution of the long gamma-ray bursts?

Abstract

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.

arXiv comment6 pages, 2 figures, forthcoming in Astron.Astrophys

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• Update on Testing the Isotropy of the Properties of Gamma-Ray Bursts
• An Oppositeness in the Cosmology: Distribution of the Gamma-Ray Bursts and the Cosmological Principle
• Distinguishing short and long $Fermi$ gamma-ray bursts
• Anisotropy in the angular distribution of the long gamma-ray bursts?
• An Independent Measure of the Kinematic Dipole from SDSS
• Statistics of the Planck CMB signal in direction of gamma-ray bursts from the BATSE and BeppoSAX catalogs
• No Enough Evidence In Support Of Correlation Between Gamma-ray Bursts And Foreground Galaxiy Clusters In the Swift Era