Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 29967

HAWC-210507A: No neutrino counterpart candidates in ANTARES search
2021-05-08T16:13:42Z (3 years ago)
Antoine Kouchner at ANTARES Collaboration <>
Alexis Coleiro (APC/Univ de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. 

Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported HAWC-210507A alert (event 1010067_1345 <>). 

No up-going muon neutrino candidate events were detected within the error box of the HAWC event during a +/- 1h time-window centered on the HAWC event time (T0), and over which the potential source remained visible all time in the up-going field of view of ANTARES. At T0, the elevation of the alert was -24 degrees below the horizon for ANTARES. 

This leads to a preliminary 90% confidence level upper limit on the muon-neutrino radiant fluence from a point source of about 15^-2 over the energy range 4 TeV ��� 4 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 37^-2 (0.7 - 380 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/-1 day has also yielded no detection (45% visibility). 

ANTARES <> is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky.
Looking for U.S. government information and services? Visit