1 Introduction

In the cosmological model for Gamma-Ray Bursts, energy production in $\gamma$-region must be enormously large, 10⁵¹ - 10⁵³ ergs, during several seconds. Such huge energy flux interacts with the matter in the parent galaxy leading to its heating and formation of counterparts in another spectral region. We investigate results of this interaction without specifying the mechanism of GRB formation.

The problem is examined by studying the response of interstellar medium with normal chemical composition on propagation through it of a short powerful gamma-ray pulse. Spherical symmetry was accepted; different densities of interstellar gas and burst energies were considered.