Correlations among gravitational wave and neutrino detector data during SN1987A

The data recorded with the neutrino detectors at Mont Blanc, Kamioka, Baksan and with the gravitational wave detectors at Maryland and Rome have been analysed during the period of SN1987A without presuming nor excluding that they are really due to neutrinos and to gravitational waves (g.w.). Correlations are found during a period of one or two hours roughly centred at 2:45 hour U.T. of 23 February 1987. The strongest correlations are between g.w. and Mont Blanc with a probability to be accidental of aboutp ∼ 10−6, g.w. and Kamioka withp ∼ 10−3, and Mont Blanc and Baksan withp ∼ 4 · 10−3. All «neutrino» signals follow the g.w. signals by a time of the order of 1 second. The basic physical problems connected with these correlations are indicated but no physical explanation of the observed phenomenon is proposed.