ИСТИНА

Gavrilyuk Yu.M, Oreshkin S.I, Popov S.M., Rudenko V.N., Semenov V.V., Silin V.A. The opto - acoustical GW detector OGRAN was presented in early papers It is a combination of the acoustical resonance bar (with the central axial tunnel) coupled with the long (2 m) optical FP cavity composed by mirrors attached to the bar ends.. A new quality of such construction is given as: (a) a more complex structure of signal response, containing separately acoustical and optical parts, and (b) a possibility to get sensitivity at the level of bar thermal noise due to the small back action of optical read out. At present the full scale setup is installed into underground facilities of BNO INR RAS and goes through the commissioning phase and test engineering series. Perspective of the next development is associated with a cryogenic version of the opto-acoustical bar tested on a pilot model having a final goal sensitivity h~10^{-21} Hz^{−1/2}. The main goal of the OGRAN detector is an operation in a deep underground of the Baksan Neutrino Observatory in parallel with Baksan Underground Scintillator Telescope (BUST) involved in the collapse searching program through the neutrino events. The BUST plus OGRAN compose the nu-gw couple for two channel registration of rare events - star collapses in the Galaxy and close environment ~ 100 Kpc The presentation contains the detail description of the new GW detector as well as proposed algorithm of joint search for nu-gw correlation.