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GCN Circular 28002

IceCube-200620A: No ANTARES neutrino counterpart
2020-06-21T06:42:25Z (4 years ago)
Antoine Kouchner at ANTARES Collaboration <>
Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. <br>  

Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported single track-like event IceCube-200620A (GCN 27997< <>>). The original reconstructed origin was 31.9 degrees below the horizon for ANTARES. <br> 
No up-going muon neutrino candidate events were recorded in a 3 deg cone around the location of the IceCube event coordinates (accounting for the reported uncertainties) during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible all time. <br>
This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of about 15^-2 over the energy range 5 TeV ���4 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and about 30^-2 (810 GeV - 405 TeV) for an E^-2.5 spectrum. 
A search over an extended time window of +/- 1 day has also yielded no detection (44% visibility). <br>
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.
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