[vsnet-grb-info 26629] HAWC-201019A: No Neutrino Counterpart detected with ANTARES

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28729
SUBJECT: HAWC-201019A: No Neutrino Counterpart detected with ANTARES
DATE:    20/10/21 20:25:59 GMT
FROM:    Antoine Kouchner at ANTARES Collaboration  <kouchner at apc.in2p3.fr>

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-201019A alert (GCN 28709 <https://gcn.gsfc.nasa.gov/gcn3/28709.gcn3>). 

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 is -15 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 17 GeV.cm^-2 over the energy range 7 TeV – 6 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 37 GeV.cm^-2 (1 - 630 TeV) for an E^-2.5 spectrum. A search over an extended time window of +/-1 day has also yielded no detection (32% visibility). 

ANTARES <http://antares.in2p3.fr/>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.