{
  "bibcode": "2020GCN.27612....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 21 April, 2020 at 00:35:24.24 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 threshold astrophysical neutrino purity for  Bronze alerts is 30% . This alert has an estimated false alarm rate of  2.8 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/133985_60770138.amon), more  sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 21 April 2020\nTime:  00:35:24.24 UT\nRA: 87.93 (+3.44/- 2.83 (+1.88/-1.64) deg  90% (50%) PSF containment) J2000\nDec: 8.23 (+2.09/-1.84 (+1.25/-1.19) deg 90% (50%) 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 no Fermi 4FGL or 3FHL catalog sources in the 50% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0545.0+0613 at RA: 86.27 deg, Dec: 6.23 deg (2.59 deg away from the best-fit event position).\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": 27612,
  "createdOn": 1587438612000,
  "email": "blaufuss@umd.edu",
  "subject": "IceCube-200421A - IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Erik Blaufuss at U. Maryland/IceCube  <blaufuss@umd.edu>",
  "eventId": "IceCube-200421A"
}