Astron. Astrophys. Suppl. Ser. 138, 517-518

Stellar evolution, GRB and their hosts

I.E. Panchenko¹ - V.M. Lipunov^1,2 - K.A. Postnov¹ - M.E. Prokhorov²

1 - Faculty of Physics, Moscow State University, 119899 Moscow, Russia
2 - Sternberg Astronomical Institute, Moscow State University, 119899 Moscow, Russia

Received January 21; accepted June 1, 1999

Abstract:

We compute the GRB rates in different types of galaxies by performing a population synthesis using the "Scenario Machine'' code in the framework of merging binary relativistic stars model. Our model predicts that $\sim 1/3$ of GRB should occur in elliptical galaxies, and this fraction should increase with the redshift. This fraction is comparable with the observed fraction of GRB without (detectable) X-ray afterglows.

Key words: gamma-rays: bursts