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Search for counterpart to IceCube-171015A with ANTARES

ATel #10854; Damien Dornic (CPPM/CNRS), Alexis Coleiro (IFIC/APC) on behalf of the ANTARES Collaboration
on 16 Oct 2017; 10:55 UT
Credential Certification: Antoine Kouchner (kouchner@apc.univ-paris-diderot.fr)

Subjects: Neutrinos

Damien Dornic (CPPM/CNRS) and Alexis Coleiro (IFIC/APC) report on behalf of the ANTARES Collaboration.

Using online data from the ANTARES detector, we have performed a follow-up analysis of the recently reported high-energy starting event (HESE) neutrino IceCube-171015 (AMON IceCube HESE 56068624_130126). The reconstructed origin was 24.5 degrees below the horizon for ANTARES.

No up-going muon neutrino candidate events were recorded within three degrees of the IceCube event coordinates during a +/- 1h time-window centered on the IceCube event time. A search on an extended time window of +/- 1 day has also yielded no detection (58% visibility probability).

A preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source is computed from the acceptance of the detector at the time of the alert. This yields to 14 GeV.cm^-2 over the energy range 2.7 TeV - 2.8 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 27 GeV.cm^-2 (440 GeV - 240 TeV) for an E^-2.5 spectrum.

ANTARES is the largest neutrino detector installed in the Mediterranean Sea, and is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is below 0.5 degrees. In the range 1-100 TeV, ANTARES has the best sensitivity to this position in the sky.