{
  "editedOn": 1743386581756,
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2025-03-30 08:31:06.33 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 1.7612 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/140729_49427574.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2025-03-30\nTime: 08:31:06.33 UT \nRA: 307.53 (+0.57, -0.47 deg 90% PSF containment) J2000\nDec: 11.07 (+0.45, -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. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu\n",
  "submitter": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
  "format": "text/plain",
  "bibcode": "2025GCN.39943....1I",
  "subject": "IceCube-250330A - IceCube observation of a high-energy neutrino candidate track-like event",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
  "circularId": 39943,
  "submittedHow": "web",
  "createdOn": 1743332528644,
  "version": 2,
  "eventId": "IceCube-250330A"
}