{
  "subject": "IceCube-230914A - IceCube observation of a high-energy neutrino candidate track-like event",
  "circularId": 34693,
  "createdOn": 1694695298136,
  "submitter": "Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.ruhr-uni-bochum.de>",
  "submittedHow": "web",
  "eventId": "IceCube-230914A",
  "bibcode": "2023GCN.34693....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-09-14 at 05:21:03.71 UT IceCube detected a track-like event with a high 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 0.8823 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/138354_45413430.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2023-08-23\nTime:  05:21:03.71 UT\nRA: 163.83 (+2.60 / -2.02 deg  90% PSF containment) J2000\nDec: +31.83 (+1.79 / - 2.13 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\nTwo Fermi 4FGL-DR4 sources are located in the 90% uncertainty region of the event. The sources are 4FGL J1051.6+3253 (NGC 3434) at RA 162.91, Dec +32.88 and 4FGL J1102.9+3014 at RA 165.74, Dec +30.24, located 1.31 and 2.28 deg away from the best fit position, respectively.\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"
}