{
  "submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
  "bibcode": "2025GCN.41235....1I",
  "eventId": "IceCube-250804A",
  "circularId": 41235,
  "format": "text/plain",
  "submittedHow": "web",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\nOn 2025-08-04 20:16:26.65 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 2.2075 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/141198_19914656.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2025-08-04\nTime:  20:16:26.65 UT \nRA: 79.50 (+0.51, -0.52 deg 90% PSF containment) J2000\nDec: 16.65 (+0.49, -0.45 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. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu",
  "createdOn": 1754380562967,
  "subject": "IceCube-250804A - IceCube observation of a high-energy neutrino candidate track-like event"
}