{
  "bibcode": "2020GCN.26696....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 20/01/09 at 23:41:39.94 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Gold alert stream.  The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 0.64 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/133609_37927131.amon <https://gcn.gsfc.nasa.gov/notices_amon_g_b/133609_37927131.amon>), more \nsophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 20/01/09 \nTime: 23:41:39.94 UT\nRA: 164.49 (+4.94 -4.19 deg 90% PSF containment) J2000\nDec: 11.87 (+1.16 -1.36 deg 90% PSF containment) J2000\n\nDue to the unique topology of this event, with a partially-contained track in the detector, it was challenging for online algorithms to reconstruct. The initially-reported direction was offset from this updated best-fit position by approximately 3 degrees.\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nThere is one Fermi 4FGL source within the 90% localization region, 4FGL J1103.0+1157    at RA: 165.77 deg, Dec: 11.97 deg (1.26 deg away from the best-fit event position). This source, which is associated with the quasar TXS 1100+122 at z=0.91, is also found in the 3FHL catalog.\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": 26696,
  "createdOn": 1578618896000,
  "email": "robert.stein@desy.de",
  "subject": "IceCube-200109A: IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Robert Stein at DESY  <robert.stein@desy.de>",
  "eventId": "IceCube-200109A"
}