GCN Circular 33403
Subject
IceCube-230306A - IceCube observation of a high-energy neutrino candidate
Date
2023-03-06T13:31:19Z (2 years ago)
From
Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2023-03-06 at 10:59:30.41 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 0.71 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/137711_79205800.amon), more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:
Date: 2023-03-06
Time: 10:59:30.41 UT
RA: 72.86 (+0.87/-0.89 deg 90% PSF containment) J2000
Dec: +34.23 (+0.87/-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.
There are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty
region. The nearest gamma-ray source in either catalog is 4FGL
J0444.6+3425 at RA: 71.16 deg, Dec: 34.42 deg (1.42 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