3 Conclusions

1.

The distribution of 2025 GRBs is anisotropic with a 99.97% probability.

2.

Separating GRBs into the two classes it is shown that the short ones are distributed anisotropically with a higher than 99% probability, but the long ones can still be distributed isotropically. There is a 98.7% probability that the short and long GRBs are distributed differently.

3.

This different behaviour of two samples cannot be caused exclusively by instrumental effects; there must exist also some intrinsic anisotropy, too.

4.

The cosmological origin is not queried by this anisotropy.

Acknowledgements

A.M. thanks for the kind hospitality at ESO. R.V. acknowledges the valuable discussions with I. Domsa. This article was partly supported by OTKA grants T024027 (L.G.B.), F29461 (I.H.), by GAUK grant 36/97 and by GACR grant 202/98/0522 (A.M.).