Evidence for anisotropy in the distribution of short-lived gamma-ray bursts

Details Evidence for anisotropy in the distribution of short-lived gamma-ray bursts Evidence for anisotropy in the distribution of short-lived gamma-ray bursts

2003-02-02

arxiv.org/abs/astro-ph/0302009v1

Mon.Not.Roy.Astron.Soc. 343 (2003) 255

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06657.x

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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