{
  "circularId": 40994,
  "subject": "IceCube-250706A - IceCube observation of a high-energy neutrino candidate track-like event",
  "eventId": "IceCube-250706A",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 25-07-06 at 13:14:40.04 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.\nThe average astrophysical neutrino purity for Gold alerts is 50%.\nThis alert has an estimated false alarm rate of 0.2382 events per year due to atmospheric backgrounds.\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/141104_37015490.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 25-07-06\nTime: 13:14:40.04 UT\nRA: 266.00 (+0.57/-0.59 deg 90% PSF containment) J2000\nDec: 38.97 (+0.49/-0.47 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",
  "submittedHow": "web",
  "bibcode": "2025GCN.40994....1I",
  "version": 2,
  "submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
  "createdOn": 1751835176264,
  "editedOn": 1751894980472,
  "format": "text/plain"
}