{
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 26-01-25 at 10:09:39.88 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. \nThe event was selected by the ICECUBE_Astrotrack_BRONZE alert stream.\nThe average astrophysical neutrino purity for Bronze alerts is 30%.\nThis alert has an estimated false alarm rate of 1.9783 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/141985_63695019.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 26-01-25\nTime: 10:09:39.88 UT\nRA: 243.72 (+0.52/-0.56 deg 90% PSF containment) J2000\nDec: 6.69 (+0.62/-0.61 deg 90% PSF containment) J2000\n\nAs announced in GCN Circular 43419, IceCube alert notices for high-energy track alerts are now also streamed via Kafka. IceCube Gold/Bronze track alerts are available on the Kafka topic 'gcn.notices.icecube.gold_bronze_track_alerts'.\nThe probability distribution of the true neutrino direction, allowing the extraction of precise 90% containment regions around the best-fit direction, is now available for revised reconstruction of high-energy track alerts.\nThe corresponding sky map is distributed as a FITS file and follows the explicit naming convention IceCube-YYMMDDX (e.g. IceCube-260125A, for this alert), where YYMMDD indicates the date of the event and X is a letter distinguishing multiple alerts on the same day. The download link (e.g., for this alert https://roc-2.icecube.wisc.edu/public/alerts/IceCube-260125A_skymap_probdensity_multiorder.fits.gz) is provided through the GCN schema distributed via Kafka.\nAdditional information will be soon available at https://gcn.nasa.gov/missions/icecube.\nIn the near future, classical GCN stream will be deactivated.\n\nNo known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of this 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",
  "subject": "IceCube-260125A - IceCube observation of a high-energy neutrino candidate track-like event",
  "eventId": "IceCube-260125A",
  "submittedHow": "web",
  "circularId": 43512,
  "submitter": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
  "bibcode": "2026GCN.43512....1I",
  "format": "text/plain",
  "createdOn": 1769340835844
}