{
  "bibcode": "2022GCN.31692....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2022-03-06 at 03:46:37.06 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. \nThe event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 0.45 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.\n\nAfter the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/136392_25495567.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2022-03-06\nTime:  03:46:37.06 UT\nRA: 314.82 (+0.54/-0.52 deg  90% PSF containment) J2000\nDec: +8.61 (+0.47/-0.55 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nThere are no Fermi 4FGL-DR2 or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in the 4FGL-DR2 catalog is 4FGL J2101.3+0912 at RA: 315.35 deg, Dec: 9.20 deg (in J2000 coordinates, 0.79 deg away from the best-fit event position).\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu",
  "circularId": 31692,
  "createdOn": 1646543614000,
  "email": "blaufuss@umd.edu",
  "subject": "IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@umd.edu>",
  "eventId": "IceCube-220306A"
}