Sn1987a 20年后重访：超新星爆炸可能不止一次？
Sn1987a Revisited after 20 Years: May the Supernova Bang More Than Once?
摘要：
回顾了超新星1987A的地下探测器观测。结果表明，虽然勃朗峰实验室的LSD探测器只在2小时52分36.8秒U.T.观测到一次爆发，Kamiokande的数据显示，除了众所周知的7小时35分33.7秒U.T.的一次爆发之外，可能还有第二次爆发。这第二个爆发由7个脉冲组成，远高于探测器的能量阈值，从7小时54分22.2秒U.T.开始，在6.2秒内观察到。这些观察结果是否意味着崩溃持续了很长时间？
英文摘要：
The observations of supernova 1987A in underground detectors are revisited. It is shown that, while the LSD detector in the Mont Blanc Laboratory observed only one burst at 2h 52min 36.8sec U.T., the Kamiokande data show a possible second burst, in addition to the well known one at 7h 35min 33.7sec U.T. This second burst consists of a cluster of seven pulses, well above the energy threshold of the detector, observed during 6.2 seconds starting at 7h 54min 22.2sec U.T. Do these observations imply a long duration of the collapse?
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