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The observations of supernova 1987A in underground detectors are revisited.It is shown that, while the LSD detector in the Mont Blanc Laboratory observedonly one burst at 2h 52min 36.8sec U.T., the Kamiokande data show a possiblesecond burst, in addition to the well known one at 7h 35min 33.7sec U.T. Thissecond burst consists of a cluster of seven pulses, well above the energythreshold of the detector, observed during 6.2 seconds starting at 7h 54min22.2sec U.T. Do these observations imply a long duration of the collapse?

Sn1987a Revisited after 20 Years: May the Supernova Bang More Than Once?