[vsnet-grb-info 24177] IceCube-191122A - IceCube observation of a high-energy neutrino candidate event
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Nov 23 09:36:26 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 26276
SUBJECT: IceCube-191122A - IceCube observation of a high-energy neutrino candidate event
DATE: 19/11/23 00:35:12 GMT
FROM: Erik Blaufuss at U. Maryland/IceCube <blaufuss at umd.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On Nov 22, 2019 at 22:45:10.50 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
threshold astrophysical neutrino purity for Bronze alerts is 30%. This
alert has an estimated false alarm rate of 3.099 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/133348_80807014.amon), more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:
Date: 19/11/22 (yy/mm/dd)
Time: 22:45:10.50 UT
RA: 27.25 (+1.70/-2.90 deg - 90% PSF containment) J2000
Dec: -0.04 (+1.17/-1.49 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
J0148.6+0127 at RA: 27.16 deg, Dec: 1.46 deg (1.51 deg away from the
best-fit event position, in J2000 coordinates). This source is also
listed as 3FHL J0148.6+0127 and is associated with the BL Lac object
PMN J0148+0129.
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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