{
  "bibcode": "2017GCN.21916....1K",
  "body": "Claudio Kopper (University of Alberta) and Erik Blaufuss (University of  Maryland) report on behalf of the IceCube Collaboration (http://icecube.wisc.edu/).\n\nOn 22 Sep, 2017 IceCube detected a track-like, very-high-energy event with a high probability of being of astrophysical origin. The event was identified by the  Extremely High Energy (EHE) track event selection. The IceCube detector was in a normal operating state. EHE events typically have a neutrino interaction vertex that is outside the detector, produce a muon that traverses the detector volume, and have a high light level (a proxy for energy). \n\nAfter the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon/50579430_130033.amon), more \nsophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 22 Sep, 2017\nTime: 20:54:30.43 UTC\nRA: 77.43 deg (-0.80 deg/+1.30 deg  90% PSF containment) J2000\nDec: 5.72 deg (-0.40 deg/+0.70 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\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": 21916,
  "createdOn": 1506128966000,
  "email": "blaufuss@icecube.umd.edu",
  "subject": "IceCube-170922A - IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@icecube.umd.edu>",
  "eventId": "IceCube-170922A"
}