Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 31670

IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
2022-03-03T20:49:24Z (2 years ago)
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <>
The IceCube Collaboration ( reports:

On 2022-03-03 at 18:00:07.62 UT IceCube detected a track-like event
with a high probability of being of astrophysical origin. 
The event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The
average astrophysical neutrino purity for Gold alerts is 50%. This
alert has an estimated false alarm rate of 0.54 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
(, more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:

Date: 2022-03-03
Time:  18:00:07.62
RA: +267.80 (+1.50/-1.17 deg  90% PSF containment) J2000
Dec: +11.42 (+0.89/-1.14 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.

There are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty
region. The nearest gamma-ray sources in either catalog are 4FGL
J1745.5+1017 at RA: 266.40 deg, Dec: 10.30 deg and 4FGL J1751.5+0938
(OT 081) at RA: 267.88 deg, Dec: 9.65 (in J2000 coordinates, both 1.78
deg away from the best-fit event 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
Looking for U.S. government information and services? Visit