ON THE GALACTIC DISK AND HALO MODELS OF GAMMA-RAY BURSTS

Statistical properties of the distribution of gamma-ray bursts are calculated for a large range of different luminosity functions assumed for the sources. Surprisingly, the observable parameters, <V/V(max)>, <cos-theta>, and <sin2 b>, are almost the same as in the "standard-candle" scenario. In particular, we found no way to reconcile the observed distribution of gamma-ray bursts with any Galactic disk model. A Galactic halo distribution must have a core radius R(c) > 18 kpc (a 3-sigma limit) to have no measurable dipole anisotropy. A cosmological distribution of the bursters is a more reasonable alternative.