The isotropy of gamma-ray bursts collected in current BATSE catalog is
studied. It is shown that the quadrupole term being proportional to N
sin 2b sin l is non-zero with a probability of 99.9%. The occurrence
of this anisotropy term is then confirmed by the binomial test even wi
th the probability of 99.97 %. Hence, the sky distribution of all know
n gamma-ray bursts is anisotropic. It is also argued that this anisotr
opy cannot be caused exclusively by instrumental effects due to the no
nuniform sky exposure of BATSE instrument. Separating the GRBs into sh
ort and long subclasses, it is shown that the short ones are distribut
ed anisotropically, but the long ones seem to be distributed still iso
tropically. The character of anisotropy suggests that the cosmological
origin of short GRBs further holds, and there is no evidence for thei
r Galactical origin.