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GCN Circular 25700

LIGO/Virgo S190910d : no neutrino counterpart candidate in ANTARES search
2019-09-10T06:25:25Z (5 years ago)
Damien Dornic at CPPM,France <>
M. Ageron (CPPM/CNRS), B. Baret (APC/CNRS), A. Coleiro (APC/Universite de Paris), M. Colomer (APC/Universite de Paris), D. Dornic (CPPM/CNRS), A. Kouchner (APC/Universite de Paris), T. Pradier (IPHC/Universite de Strasbourg) report on behalf of the ANTARES Collaboration: 

Using on-line data from the ANTARES detector, we have performed a follow-up analysis of the 
recently reported LIGO/Virgo S190910d event using the 90% contour of the bayestar probability 
map provided by the GW interferometers (GCN#25695 <>). The ANTARES visibility at the time of the 
alert, together with the 50% and 90% contours of the probability map are shown at <>. 
Considering the location probability provided by the LIGO/Virgo collaborations, there is a 
50.9% chance that the GW emitter was in the ANTARES **upgoing** field of view at the time of 
the alert. 

No up-going muon neutrino candidate events were recorded in the ANTARES sky during a 
+/-500s time-window centered on the time 2019-09-10 01:26:19 and in the 90% contour of the S190910d 
event. The expected number of atmospheric background events in the region visible by ANTARES is 
9.24e-04 in the +/- 500s time window. An extended search during +/- 1 hour gives no 
up-going muon neutrino coincidence. The expected number of atmospheric background events in the 
region visible by ANTARES is 6.65e-03 in this larger time window. 

ANTARES is the largest undersea neutrino detector, installed in the Mediterranean Sea, and it is 
primarily sensitive to 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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