Anisotropy in the sky distribution of short gamma-ray bursts |
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| Authors: | V F Litvin S A Matveev S V Mamedov V V Orlov |
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| Institution: | (1) Research Institute of Physics, St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, 198904, Russia;(2) Astronomical Institute, St. Petersburg State University, Bibliotechnaya pl. 2, Petrodvorets, 198904, Russia |
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| Abstract: | We analyze the sky distribution of various types of cosmic gamma-ray bursts (GRBs): short, long, and intermediate; they are determined by burst duration T 90 (T 90 is the time during which 90% of the burst energy is accumulated). We have found an anisotropy in the distribution of intermediate (2 s < T 90 < 8 s) and short (T 90 < 8 s) GRBs in the form of spots with an enhanced GRB concentration near the Galactic coordinates l=115° and b=30°. Given the BATSE nonuniform exposure function, the statistical significance of the anisotropy is 99.89% for intermediate GRBs and 99.99% for short GRBs. Thus, we suggest that this anisotropy has a natural origin and is not caused by BATSE instrumental effects. |
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| Keywords: | cosmic gamma-ray bursts |
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