{
  "bibcode": "2020GCN.27787....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 20/05/23 at 02:30:07.59 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 4.9 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/134116_58596690.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 20/05/23 \nTime: 02:30:07.59 UT\nRA: 338.64 (+10.77 -6.07 deg 90% PSF containment) J200\nDec: 1.75 (+1.84 -3.54 deg 90% PSF containment) J2000\n\nThe larger than usual error region in RA from the offline reconstructions is being investigated.   \n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nTen sources from the Fermi 4FGL catalog are inside the 90% localization region, the closest being 4FGL J2227.9+0036 located at RA 336.98 deg and Dec 0.62 deg (at a distance of 2.01 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": 27787,
  "createdOn": 1590206422000,
  "email": "blaufuss@umd.edu",
  "subject": "IceCube-200523A - IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@umd.edu>",
  "eventId": "IceCube-200523A"
}