{
  "circularId": 33870,
  "submitter": "Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>",
  "createdOn": 1684936223645,
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-05-24 at 11:09:36.24 UT IceCube detected a track-like event\nwith a moderate probability of being of astrophysical origin. \nThe event was selected by the ICECUBE_Astrotrack_Bronze alert stream.\nThe average astrophysical neutrino purity Bronze alerts is 30%.\n\nThis alert has an estimated false alarm rate of 4.25 events per year\ndue to atmospheric backgrounds. The IceCube detector was in a normal\noperating state at the time of detection.\n\nAfter the initial automated alert\n(https://gcn.gsfc.nasa.gov/notices_amon_g_b/137971_11526243.amon), more\nsophisticated reconstruction algorithms have been applied offline, with\nthe direction refined to:\n\nDate: 2023-05-24\nTime:  11:09:36.24 UT\nRA: 318.43 (+3.12 / -2.59 deg  90% PSF containment) J2000\nDec: +2.84 (+2.55 / -2.43 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help\nidentify a possible astrophysical source for the candidate neutrino.\n\nTwo gamma-ray sources listed in the 4FGL Fermi-LAT catalog are located\nwithin the 90% uncertainty region. The sources are 4FGL J2110.3+0404\nand 4FGL J2109.6+0440 located 1.50 and 2.10 deg away from the best-fit\nposition, respectively.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector\noperating at the geographic South Pole, Antarctica.\n\nThe IceCube realtime alert point of contact can be reached at\nroc@icecube.wisc.edu\n\n\n",
  "subject": "IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event",
  "eventId": "IceCube-230524A",
  "bibcode": "2023GCN.33870....1I"
}