If supercompact binary systems formed by primordial black holes (PBH} with masses $m>10^{16}$ g constitute the major part of the dark matter in the Universe, then the high frequency diffuse gravitational radiation with the flux of the order of 1 erg$\cdot$см$^{-2}\cdot$с$^{-1}$ should be expected. A possibility that a part of the gammaray-bursts observed is a consequence of coalescence of binary PBH in the Galaxy halo limits is discussed. It is pointed out that these systems can be detected when high-frequency ($\omega>10^4$ Hz) gravitational radiation is recorded.
Department of Quantum Theory and High-Energy Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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