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GCN Circular 30010

Subject
AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEM-210515A and 210515B
Date
2021-05-15T03:15:53Z (3 years ago)
From
Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>
The AMON,  IceCube, and HAWC collaborations report:

The AMON NuEm stream channel found two coincidence alerts 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 ~6 hours.

NuEM-210515A
The HAWC transit interval starts  from 05-14-2021 18:06:02 UT to
05-15-2021 00:20:43 UT
(End of the HAWC transit time)

The location of the coincidence is reported as
RA (J2000): 93.64deg
Dec (J2000): 14.66 deg
Location uncertainty (50% containment): 0.15 deg (statistical only).
Location uncertainty (90% containment): 0.27 deg (statistical only).

The false alarm rate (FAR) of this coincidence is 3.93 per year.

NuEM-210515B
The HAWC transit interval starts  from 05-14-2021 18:09:25 UT to
05-15-2021 00:19:27 UT
(End of the HAWC transit time)

The location of the coincidence is reported as
RA (J2000): 93.93deg
Dec (J2000): 12.51deg
Location uncertainty (50% containment): 0.20 deg (statistical only).
Location uncertainty (90% containment): 0.36 deg (statistical only).

The false alarm rate (FAR) of this coincidence is 1.90 per year.

We encourage follow-up observations of the alert region contingent on
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 of this analysis
https://iopscience.iop.org/article/10.3847/1538-4357/abcaa4
Information on the IceCube collaboration: http://icecube.wisc.edu/
Information on the HAWC collaboration: https://www.hawc-observatory.org
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