https://builderscon.io/tokyo/2019/session/2c1c0bcd-960c-11e9-a530-42010af01081 There was a minor correction to the explanation of the detection of supernovas. Please see Appendix 3 on http://www-sk.icrr.u-tokyo.ac.jp/~hayato/20190831_Super-Kamiokande.pdf. The relevant portion of the video has been edited out to avoid confusion 超新星の検知の説明について一部誤解を招きかねない表現がありました。詳細は http://www-sk.icrr.u-tokyo.ac.jp