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We re-examine the data taken by the neutrino detectors during the supernovaSN1987A. It is found that the Kamiokande data, in addition to the well knownburst at 7:35 hours UT, show another one at 7:54 hours, with seven pulses in6.2 seconds. This second burst supports the idea that the duration of thecollapse was much longer than a few seconds, as already suggested by the LSDdetection at 2:56 hours the same day, i.e. four and a half hours earlier. Thecorrelations between the gravitational wave detectors (Rome and Maryland) andthe neutrino detectors are also revisited. It is shown that the g.w. detectorsexhibit significant correlations with both the LSD and the Kamiokande detectorsover periods of one-two hours that are centered, in both cases, at the LSDtime.

SN1987A: Revisiting the Data and the Correlation between Neutrino and Gravitational Detectors