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

Stellar evolution, GRB and their hosts

I.E. Panchenko1 - V.M. Lipunov1,2 - 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


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

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