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Evidence for anisotropy in the distribution of short-lived gamma-ray bursts
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Measurements of the two-point angular correlation function w(\theta) for 407 short gamma-ray bursts collected in the Current BATSE Catalogue reveal a ~2 \sigma deviation from isotropy on angular scales \theta ~ 2-4 degrees. Such an anisotropy is not observed in the distribution of long gamma-ray bursts and hints to the presence of repeated bursts for up to ~13% of the sources under exam. However, the available data cannot exclude the signal as due to the presence of large-scale structure. Under this assumption, the amplitude of the observed w(\theta) is compatible with those derived for different populations of galaxies up to redshifts ~0.5, result that suggests short gamma-ray bursts to be relatively local sources.
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Probing dipole and quadrupole anisotropy in Gamma-ray bursts from Swift dataset
Swift GRB catalog shows dipole and quadrupole signals consistent with isotropy once the instrument exposure map is included in Monte Carlo null tests.
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