Swift GRB catalog shows dipole and quadrupole signals consistent with isotropy once the instrument exposure map is included in Monte Carlo null tests.
Evidence for anisotropy in the distribution of short-lived gamma-ray bursts
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abstract
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.