GCN Circular 32909
Subject
IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2022-11-04T12:42:30Z (2 years ago)
From
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2022-11-04 at 06:10:08.18 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 2.63 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/137217_75180896.amon), more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:
Date: 2022-11-04
Time: 06:10:08.18 UT
RA: 209.62 (+0.74/-0.92 deg 90% PSF containment) J2000
Dec: +15.09 (+0.79/-0.80 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 source in either catalog is 4FGL
J1403.7+1513 at RA: 210.94 deg, Dec: 15.23 deg (1.28 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 roc@icecube.wisc.edu