  The present common view about GRB origin is related to cosmology. There are
two evidences in favor of this interpretation. The first is connected with
statistics, the second is based on measurements of the redshifts in the GRB
optical afterglows. Redshifts in optical afterglows had been observed only in
long GRB. Comparison of KONUS and BATSE data about statistics and hard X-ray
lines is done, and some differences are noted. Hard gamma-ray afterglows,
prompt optical spectra and polarization measurements could be very important
for farther insight into GRB origin.
  Possibility of galactic origin of short GRB is discussed as well as their
possible connection with soft gamma repeaters.

Astrophysics