Anisotropy in the sky distribution of short gamma-ray bursts

We analyze the sky distribution of various types of cosmic gamma-ray bursts (GRBs): short, long, and intermediate; they are determined by burst durati on T-90 (T-90 is the time during which 90% of the burst energy is accumulat ed). 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 enhan ced GRB concentration near the Galactic coordinates l = 115 degrees and b = 30 degrees. Given the BATSE nonuniform exposure function, the statistical significance of the anisotropy is 99.89% for intermediate GRBs and 99.99% f or short GRBs. Thus, we suggest that this anisotropy has a natural origin a nd is not caused by BATSE instrumental effects. (C) 2001 MAIK "Nauka/Interp eriodica".