{
  "bibcode": "2023GCN.33204....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-01-22 03:50:02.00 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin.  The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity for Bronze alerts is 30%. This alert has an estimated false alarm rate of 3.62 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/137571_16496893.amon), more  \nsophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2023-01-22\nTime:  03:50:02.00 UT\nRA:16.79 (+3.17 / -2.56 deg  90% PSF containment) J2000\nDec: +7.78 (+3.44 / -3.26 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 four known gamma-ray sources listed in the Fermi 4FGL catalog within the 90% uncertainty region of the event. The nearest one is 4FGL J0100.3+0745 (RA: 15.09 deg, Dec: 7.76 deg in J2000 coordinates), 1.68 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": 33204,
  "createdOn": 1674365088000,
  "email": "blaufuss@umd.edu",
  "subject": "IceCube-230122A - IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@umd.edu>",
  "eventId": "IceCube-230122A"
}