{
  "circularId": 35604,
  "createdOn": 1706022400286,
  "eventId": "IceCube-240123A",
  "submittedHow": "web",
  "subject": "IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event",
  "bibcode": "2024GCN.35604....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2024-01-23 at 11:25:36.05 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 4.1505 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/138890_34080563.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2024-01-23\nTime:  11:25:36.05\nRA: 357.54 (+1.93, -1.71 deg  90% PSF containment) J2000\nDec: +4.26 (+0.80, -0.76 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\nThere are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J2349.4+0534 at RA: 357.36 deg, Dec: 5.58 deg (1.33 deg away from the best-fit event position).\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime \nalert point of contact can be reached at roc@icecube.wisc.edu\n",
  "submitter": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>"
}