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Recently estimation of merger rate of double neutron stars from the observations of PSR J0737-3039 by Burgay is discussed under real astrophysical background., Comment: 8 pages, including 3 figures. ASS, in press

The Invited Review on Joint Discussion "High Energy Transients" on XXIIIrd General Assembly of IAU, Kioto, 1997 is presented. The simulated rates of neutron star + neutron star, neutron star + black hole and black hole + black hole mergings are considered in relation with the problem of GRBursts origin and gravitational waves detection., Comment: 14 pages, LaTeX, 4 figures

The simulated rates of NS+NS, NS+BH and BH+BH mergings are considered in relation with the problem of GRBursts origin and gravitational waves detection., Comment: 5 pages, LaTeX, jd.sty, 4 figures

The possible low-frequency radio emission from the progenitors of gamma ray bursts can experience a delay from tens of seconds to hours on the way to the observer due to the dispersion in galactic and extragalactic plasma, and thus reach the observer as a radio afterglow of the burst. This opens a unique possibility (peculiar "Time Machine") of seeing what happened in that place before the catastrophe., Comment: 4 pages latex

Binary neutron stars mergers that are expected to be the most powerful source of energy in the Universe definitely exist in nature, as is proven by the observed behavior of the Hulse-Taylor binary radio pulsar. Though most of energy in such events is radiated in gravitational waves, there probably exist several mechanisms giving also electromagnetic radiation. We propose a new one, involving a revival of the radio pulsar several orbital cycles before the merger., Comment: 4 pages, LaTeX file, 2 Postscript figures