EFFECT OF HARDNESS INTENSITY CORRELATION OF COSMIC GAMMA-RAY BURSTS, AS EXPLAINED BY MODELS OF THE EXTENDED GALACTIC HALO/

The effect of hardness/intensity correlation has been determined, as t he result of statistical study of cosmic gamma-ray bursts (GRBs) by Mi trofanov. Paciesas, and their coworkers. For five brightness groups of GRBs selected by Mallozzi and coworkers, the cosmological origin of t his effect was suggested, due to the cosmological redshift. On the oth er hand, this effect is shown to be explained by models of the extende d Galactic halo, provided that the broad distribution of radiated powe r is postulated for emitters of GRBs, together with intrinsic correlat ion between emissivity and spectral hardness of radiated photons.