[vsnet-grb-info 28456] IceCube-210730A - IceCube observation of a high-energy neutrino candidate track-like event
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Jul 31 09:20:42 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 30559
SUBJECT: IceCube-210730A - IceCube observation of a high-energy neutrino candidate track-like event
DATE: 21/07/31 00:19:51 GMT
FROM: Marcos Santander at U. Alabama/IceCube <jmsantander at ua.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2021-07-30 at 22:12:40.629 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 2.542 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.
After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/135553_7213992.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2021-07-30
Time: 22:12:40.629 UT
RA: 105.73 (+2.00, -1.85 deg 90% PSF containment) J2000
Dec: 14.79 (+0.91, -0.86 deg 90% PSF containment) J2000
We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.
One gamma-ray source listed in the 4FGL Fermi-LAT catalog is located within the 90% uncertainty region of the best-fit candidate neutrino position. The source is 4FGL J0659.7+1416, 0.92 deg away from the best-fit position.
The 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 at icecube.wisc.edu
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