{
  "circularId": 34163,
  "submitter": "Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.ruhr-uni-bochum.de>",
  "subject": "IceCube-230707A - IceCube observation of a high-energy neutrino candidate track-like event",
  "createdOn": 1688753683767,
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 23-07-07 at 16:58:50.03 UT IceCube detected a track-like event with\na high probability of being of astrophysical origin.\n\nThe event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The\naverage astrophysical neutrino purity for Gold alerts is 50%. This\nalert has an estimated false alarm rate of 0.4443 events per year due\nto atmospheric backgrounds.  The IceCube detector was in a normal\noperating state at the time of detection.  After the initial automated\nalert\n(https://gcn.gsfc.nasa.gov/notices_amon_g_b/138125_11333473.amon), more\nsophisticated reconstruction algorithms have been applied offline, with\nthe direction refined to:\n\nDate: 23-07-07\nTime: 16:58:50.03 UT\nRA: 269.03 (+0.88 / -0.76 deg  90% PSF containment) J2000\nDec: -1.94 (+0.53 / -0.54 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help\nidentify a possible astrophysical source for the candidate neutrino.\n\nThere are no Fermi 4FGL-DR3 or 3FHL catalog sources in the 90%\nuncertainty region. The nearest gamma-ray source in either catalog is\n4FGL J1759.0-0107 at RA: 269.77 deg, Dec: -1.12 deg (1.10 deg away from\nthe best-fit event position).\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector\noperating at the geographic South Pole, Antarctica. The IceCube\nrealtime alert point of contact can be reached at roc@icecube.wisc.edu\n\n",
  "eventId": "IceCube-230707A",
  "bibcode": "2023GCN.34163....1I"
}