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Revisiting the statistical isotropy of GRB sky distribution

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arxiv 1905.08864 v2 pith:OFHLCDVR submitted 2019-05-21 astro-ph.CO astro-ph.HEgr-qc

Revisiting the statistical isotropy of GRB sky distribution

Uendert Andrade , Carlos A. P. Bengaly , Jailson S. Alcaniz , Salvatore Capozziello This is my paper
classification astro-ph.CO astro-ph.HEgr-qc
keywords isotropydistributionstatisticaluncertaintiesaccountangularanisotropicassumption
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The assumption of homogeneity and isotropy on large scales is one of the main hypotheses of the standard cosmology. In this paper, we test the hypothesis of isotropy from the two-point angular correlation function of 2626 gamma-ray bursts (GRB) of the FERMI GRB catalogue. We show that the uncertainties in the GRB positions induce spurious anisotropic signals in their sky distribution. However, when such uncertainties are taken into account no significant evidence against the large-scale statistical isotropy is found. This result remains valid even for the sky distribution of short-lived GRB, contrarily to previous reports.

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