{
  "bibcode": "2021GCN.31126....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 21/11/25 at 06:22:21.56 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 1.973 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/135936_74588253.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 21/11/25\nTime: 06:22:21.56 UT\nRA: 43.59 (+ 3.13 - 2.71 deg 90% PSF containment) J2000\nDec: 22.59 (+ 1.54 - 2.53 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 two Fermi-LAT 4FGL sources inside the 90% localization region. The nearest source is 4FGL J0248.0+2232, located at RA 42.01 deg and Dec 22.54 deg (J2000), at a distance of 1.46 degrees from the best-fit location.\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",
  "circularId": 31126,
  "createdOn": 1637856780000,
  "email": "cristina.lagunas@desy.de",
  "subject": "IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Cristina Lagunas Gualda at DESY  <cristina.lagunas@desy.de>",
  "eventId": "IceCube-211125A"
}