[vsnet-grb-info 21276] IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Oct 24 04:40:06 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 23375
SUBJECT: IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
DATE: 18/10/23 19:38:53 GMT
FROM: Erik Blaufuss at U. Maryland/IceCube <blaufuss at umd.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 23 October 2018 UTC IceCube detected a track-like, very-high-energy
event with a high probability of being of astrophysical origin. The
event was identified by the Extremely High Energy (EHE) track event
selection. The IceCube detector was in a normal operating state. EHE
events typically have a neutrino interaction vertex that is outside the
detector, produce a muon that traverses the detector volume, and have a
high light level (a proxy for energy).
After the initial automated alert
(https://gcn.gsfc.nasa.gov/notices_amon/53411354_131653.amon), more
sophisticated reconstruction algorithms have been applied offline, with
the direction refined to:
Date: 18/10/23
Time: 16:37:32.65 UTC
RA: 270.18 (-1.70,+2.00 deg 90% PSF containment) J2000
Dec: -8.57 (-1.30,+1.25 deg 90% PSF containment) J2000
The closest sources to this position among Fermi-LAT catalogs 3FGL,
2FGL, and 3FGL and Roma-BZCat is the unassociated source 3FGL
J1804.5-0850 (1.3 degrees from best fit refined direction). We
encourage follow-up of this alert by ground and space-based instruments
to help identify a possible astrophysical source for the candidate neutrino.
The original GCN Notice contained an incorrect statement that “this EHE
event is the same as the previously reported HESE event.” This is a
unique EHE alert trigger and unrelated to previously reported HESE alerts.
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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