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GCN Circular 27700

FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
2020-05-08T20:44:49Z (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. 

Following the detection of fast radio bursts (ATel #13681 <>, #13682 <>,  #13684 <>) accompanied with X-ray flares (GCN Circular #27657 <>, #27659 <>, #27661 <>; ATel #13675 <>, #13678 <>, #13679 <>,  #13685 <>, #13686 <>, #13687 <>, #13688 <>), we have performed a search, using ANTARES data, for up-going muon neutrino candidates from the direction of  SGR 1935+2154 in a time window of +/- 1h around the time of the X-ray trigger (14:34:24 UTC). At this time, the source was located 19 degrees below the horizon for ANTARES, and remained visible over the whole  +/- 1h time window.  

No up-going muon neutrino candidate events were recorded at the location of the source.
This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of 14^-2 over the energy range 5.6 TeV ��� 5.4 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 30^-2 (1 TeV - 515 TeV) for an E^-2.5 spectrum.

A search over an extended time window of +/- 1 day has also yielded no detection (38% 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.
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