[vsnet-grb-info 22057] LIGO/Virgo S190421ar/G330308: ANTARES neutrino search

GCN Circulars gcncirc at capella2.gsfc.nasa.gov
Tue Apr 23 23:55:42 JST 2019


TITLE:   GCN CIRCULAR
NUMBER:  24156
SUBJECT: LIGO/Virgo S190421ar/G330308: ANTARES neutrino search
DATE:    19/04/23 14:55:34 GMT
FROM:    Damien Dornic at CPPM,France  <dornic at cppm.in2p3.fr>

M. Ageron (CPPM/CNRS), B. Baret (APC/CNRS), A. Coleiro (APC/Universite Paris Diderot), M. Colomer (APC/Universite Paris Diderot)), D. Dornic (CPPM/CNRS), A. Kouchner (APC/Universite Paris Diderot), 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 G330308/S190421ar event using the 90% contour of the probability map provided by the GW interferometers at event time. The ANTARES visibility at the time of the alert, together with the 50% and 90% contours of the probability map are shown in https://www.cppm.in2p3.fr/~dornic/events_runo3/S190421ar.png <https://www.cppm.in2p3.fr/~dornic/events_runo3/S190421ar.png>. Considering the location probability provided by the LIGO/Virgo collaborations, there is a 52% 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 (2019-04-21 21:38:56 UT) and in the 90% contour of the G330308/S190421ar event. The expected number of atmospheric background events in the region visible by ANTARES is 4.0e-4 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 2.9e-3 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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