{
  "bibcode": "2017GCN.20929....1B",
  "body": "Erik Blaufuss (University of Maryland) reports on behalf of the IceCube \nCollaboration (http://icecube.wisc.edu/).\n\nOn 21 March, 2017 IceCube detected a track-like, very-high-energy event \nwith a high probability of being of astrophysical origin. The event was \nidentified by the  Extremely High Energy (EHE) track event selection.   \nThe IceCube detector was in a normal operating state. EHE events \ntypically have a neutrino interaction vertex that is outside the \ndetector, produce a muon that traverses the detector volume, and have a \nhigh light level (a proxy for energy).\n\nAfter the initial automated alert \n(https://gcn.gsfc.nasa.gov/notices_amon/80305071_129307.amon), more \nsophisticated reconstruction algorithms have been applied offline, with \nthe direction refined to:\n\nDate: 2017-03-21\nTime: 07:32:20.69 UT\nRA: 98.30  (+/- 1.2  deg  90% PSF containment) J2000\nDec:  -15.02(+/- 1.2 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\nThis event was found to be close to  the edge of the instrumented \ndetector volume, which has\nincreased the overall direction uncertainty for this event.\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",
  "circularId": 20929,
  "createdOn": 1490144526000,
  "email": "blaufuss@icecube.umd.edu",
  "subject": "IceCube-170321A - IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@icecube.umd.edu>",
  "eventId": "IceCube-170321A"
}