GCN Circular 28504
Subject
IceCube-200926A: IceCube observation of a high-energy neutrino candidate event
Date
2020-09-26T10:15:23Z (4 years ago)
From
Cristina Lagunas Gualda at DESY <cristina.lagunas@desy.de>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 20/09/26 at 07:54:11.62 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 0.536 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/134533_53384881.amon), more
sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 20/09/26
Time: 07:54:11.62 UT
RA: 96.46 (+ 0.73 - 0.55 deg 90% PSF containment) J2000
Dec: -4.33 (+ 0.61 - 0.76 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-LAT 4FGL or 3FHL sources inside the 90% localization region. The closest source is 4FGL J0613.7-0201 located at RA 93.44 deg and Dec -2.02 deg (J2000), at a distance of 3.8 degrees from the best-fit location.
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