{
  "subject": "IceCube-231027A - IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.ruhr-uni-bochum.de>",
  "submittedHow": "web",
  "eventId": "IceCube-231027A",
  "bibcode": "2023GCN.34891....1I",
  "circularId": 34891,
  "createdOn": 1698410932988,
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 23-10-27 at 04:16:10.44 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 0.1472 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/138487_60138479.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 23-10-27\nTime: 04:16:10.44 UT\nRA: 267.16 (+3.35/-3.40 deg 90% PSF containment) J2000\nDec: +46.96 (+2.25/-2.88 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\nSeven gamma-ray sources listed in the 4FGL-DR3 Fermi-LAT catalog are located in the 90% containment region. The closest source is 4FGL J1747.9+4704 at RA 266.99, Dec +47.07, 0.16 deg away from the best-fit position.\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\n"
}