{
  "subject": "[TEST] Super-Kamiokande finds a supernova in the Milky Way Galaxy",
  "body": "        H. Sekiya, Kamioka Observatory, Institute for Cosmic Ray Research,\nUniversity of Tokyo, reports on behalf of the Super-Kamiokande collaboration:\n\nSuper-Kamiokande, a 50000 ton water Cherenkov imaging detector situated\n1000 meters underground in the Kamioka mine, Gifu, Japan, has observed a\nneutrino burst from a nearby supernova.  Within a fiducial volume of 22500\ntons, preliminary results indicate 8302 neutrino-produced events have been\ndetected with energies greater than 6.0 MeV. An SN1987A-like explosion\nwould be expected to produce such a signal in Super-Kamiokande if the\nprogenitor star was located at a distance between 5.99 and 8.22 kpc from\nEarth. These events were observed over an interval of 20.0 seconds, with\nthe first event arriving at 2026/Apr/28 01:13:00 122727 [us] UT. The estimated supernova\ndirection is R.A. = -81 (degrees) and Dec.= -3 (degrees), within\n2.48, 3.66 and 4.17 degrees for, respectively, 68, 90 and 95%% C.L. error circles.\nThe probability to have the SN located within 2, 5, and 10 degrees of the\ncentral position is 0.54, 0.99 and 1.00, respectively.",
  "submitter": "pronost@km.icrr.u-tokyo.ac.jp",
  "submittedHow": "web",
  "createdOn": 1777341023968,
  "circularId": 33699,
  "format": "text/plain"
}