Astron. Astrophys. Suppl. Ser. 138, 489-490

Optical counterparts of cosmological GRBs due to heating of ISM in the parent galaxy

G.S. Bisnovatyi-Kogan¹ - A.N. Timokhin ^1,2

Send offprint request: A.N. Timokhin

1 - Space Research Institute, Profsoyuznaya 84/32, 117810 Moscow, Russia
e-mail: gkogan@mx.iki.rssi.ru
2 - Sternberg Astronomical Institute, Universitetskij pr. 13, 119899 Moscow, Russia
e-mail: timokhin@mx.iki.rssi.ru

Received January 21; accepted July 5, 1999

Abstract:

We investigated influence of cosmological GRB on the surrounding interstellar medium. It was shown that $\gamma$-radiation from the burst heats interstellar gas to the temperatures >10⁴ K up to the distance $\sim10$ pc. For high density ISM, optical and UV radiation of the heated, gas can be observed on the Earth several years as a GRB's counterpart.

Key words: gamma-rays: bursts