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From the observation of a millisecond pulsar in SN 1987A, the followingimplications are obtained. 1) The pulsar spindown in SN 1987A is caused byradiating gravitational waves rather than by magnetic dipole radiation and/orrelativistic pulsar winds. 2) A mildly deformed shock wave would be formed atthe core-collapse and explosion in SN 1987A, which is consistent with theconclusion given in Nagataki (2000). 3) The gravitational waves from the pulsarshould be detected in several years using a Fabry-Perot-Michelsoninterferometer as the gravitational detector, such as LIGO and TAMA. 4) Theneutrino oscillation model is not a promising model for the explanation of thekick velocity of the pulsar in SN 1987A. The hydrodynamical instability modelis more favored.Comment: 8 pages. Accepted by Progress of Theoretical Physics after minor  revision

Implications of the Discovery of a Millisecond Pulsar in SN 1987A