{
  "bibcode": "2019GCN.25402....1I",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2019-08-19 at 17:34:24.24 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 3.9 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/132974_67924813.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2019-08-19\nTime:  17:34:24.24 UT\nRA: 148.80 (+2.07 -3.24 deg  90% PSF containment) J2000\nDec: 1.38 (+1.00 -0.75 deg 90% PSF containment) J2000\n\nThe Fermi-LAT catalogue source 4FGL J0946.2+0104, associated with a BL Lac object at a redshift of z = 0.58, is located within the 90% uncertainty region of the event with an offset of 1.1 degrees from the best-fit neutrino location. This source is also listed as 3FHL J0946.2+0104 in the 3FHL catalog of hard Fermi-LAT gamma-ray sources.\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\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<mailto:roc@icecube.wisc.edu>",
  "circularId": 25402,
  "createdOn": 1566243577000,
  "email": "jmsantander@ua.edu",
  "subject": "IceCube-190819A - IceCube observation of a high-energy neutrino candidate event",
  "submitter": "Marcos Santander at U. Alabama/IceCube  <jmsantander@ua.edu>",
  "eventId": "IceCube-190819A"
}