  The gamma-ray bursts detected by the BATSE instrument may be separated into
"short", "intermediate" and "long" subgroups. Previous statistical tests found
an anisotropic sky-distribution on large angular scales for the intermediate
subgroup, and probably also for the short subgroup. In this article the
description and the results of a further statistical test - namely the nearest
neighbour analysis - are given. Surprisingly, this test gives an anisotropy for
the long subgroup on small angular scales. The discussion of this result
suggests that this anisotropy may be real.

Astrophysics