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Seminars

All-Moscow Seminar of Astrophysicists
(ASA)

The seminar is supported by the grant of Federal Programm "Integration"
annotation of talk
V.N.Rudenko, A.V.Gusev, V.K.Kravchuk, M.P.Vinogradov (SAI)
"Search for correlation of gravitational detector noise background with astrophysical events accompanied by neutrino and gamma radiation"


A new approach in the gravitational wave experiment is considered. In addition to the old method of searching for coincident reaction of two separated gravitational antennae it is proposed to seek perturbations of the gravitational detector noise background correlated with astrophysical events such as neutrino and gamma ray bursts registered by correspondent detectors. The reason of this approach lies in understanding that last stages of stellar evolution such as a binary coalescence, supernova explosion, collapse, traditionally considered as gravitational burst sources, should be accompanied also neutrino and very likely gamma radiation. It means in general that a detection of neutrino or gamma ray bursts defines time marks around which one might hope to find also gravitational detector exitations. An advantage of this method consists first of all in a remarkable reduction of the observational time interval and second in a potentional opportunity to accumulate week gravitational signals. A list of desirable events at present can be provided by four world neutrino telescops and cosmic CGRO and BepoSAX satellites. In this situation one has to formulate an joint optimal data processing algorithm for gravitational detector output with parallel records of neutrino and gamma ray observatories. A simple searching for coincidences is insufficient due to an inevitable unknown time deay between events of different nature but mainly due to a deficit of gravitational and neutrino detector sensitivity. It has to be done according to the optimal filtration theory taking into account available information of noise and conceivable model of signal. A first version of such optimal algorithm is presented in this report. Its efficiency is demonstrated in reanalysis of the old data concerning the phenomenon of neutrino-gravity correlation registered during of SN1987A explosion.