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GCN Circular 35566

Subject
AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A
Date
2024-01-18T18:27:40Z (a month ago)
From
Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>
Via
legacy email
The AMON,  IceCube, and HAWC collaborations report:

The AMON NuEm stream channel found a coincidence alert from the
IceCube online neutrino selection + HAWC daily monitoring analysis.
The analysis looks for IceCube neutrino events -mostly atmospheric
in origin- around the position and transit time of a HAWC cluster of
likely gamma rays, as identified in the integrated observations from
a single transit, in this case having a duration of 4.96 hours.

The HAWC transit interval starts from 2024/01/18 12:57:47 UT  to
2024/01/18 14:13:13 UT
(End of the HAWC transit time)

The location of the coincidence is reported as
RA (J2000): 257.73 deg
Dec (J2000): 53.78 deg
Location uncertainty (50% containment): 0.30 deg (statistical only).
Location uncertainty (90% containment): 0.55 deg (statistical only).

The false alarm rate (FAR) of this coincidence is 2.1 per year.
We encourage follow-up observations of the alert region contingent on
the availability of resources and interest, given the quoted FAR.

AMON seeks to perform a real-time correlation analysis of the
high-energy signals across all known astronomical messengers. More
information about AMON can be found in https://www.amon.psu.edu/
Information on the IceCube collaboration: http://icecube.wisc.edu/
Information on the HAWC collaboration: https://www.hawc-observatory.org

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