{
  "bibcode": "2025GCN.40280....1I",
  "createdOn": 1745953626307,
  "eventId": "IceCube-250429A",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 25-04-29 at 15:23:15.63 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. \nThe event was selected by the ICECUBE_Astrotrack_GOLD alert stream.\nThe average astrophysical neutrino purity for Gold alerts is 50%.\nThis alert has an estimated false alarm rate of 0.496 events per year due to atmospheric \nbackgrounds.\nThe 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/140870_26727884.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 25-04-29\nTime: 15:23:15.63 UT\nRA: 59.68 (+0.47/-0.57 deg 90% PSF containment) J2000\nDec: 25.32 (+0.39/-0.44 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\nNo known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of the event.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica.\n\nThe IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu\n",
  "submittedHow": "web",
  "subject": "IceCube-250429A - IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
  "circularId": 40280,
  "format": "text/plain"
}