{
  "bibcode": "2021GCN.30026....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 16 May 2021 at 14:38:20.34 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 3.1 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/135292_56063172.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 16 May 2021\nTime:  14:38:20.34 UT\nRA: 91.76 (+1.05  -0.97 deg  90% PSF containment) J2000\nDec: +9.52 ( +0.50 -0.58 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\nThere are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0608.6+1149 at RA: 92.17 deg, Dec: 11.83 deg J2000 (2.34 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": 30026,
  "createdOn": 1621183019000,
  "email": "jmsantander@ua.edu",
  "subject": "IceCube-210516A - IceCube observation of a high-energy neutrino candidate track-like event",
  "submitter": "Marcos Santander at U. Alabama/IceCube  <jmsantander@ua.edu>",
  "eventId": "IceCube-210516A"
}