Publications associated with T2K

Search for neutrinos in super-kamiokande associated with the GW170817 neutron-star merger

Astrophysical Journal Letters American Astronomical Society 857 (2018) 1-6

Y Sonoda, A Takenaka, T Yano, T Kajita, V Takhistov, J Hill, JY Kim, E O'Sullivan, K Scholberg, M Gonin, J Imber, K Choi, B Richards, R Tacik, SB Kim, B Quilain, C Simpson, Y Suzuki, HA Tanaka, T Towstego, A Konaka, S Chen, L Wan, A Minamino

We report the results of a neutrino search in Super-Kamiokande (SK) for coincident signals with the first detected gravitational wave (GW) produced by a binary neutron-star merger, GW170817, which was followed by a short gamma-ray burst, GRB170817A, and a kilonova/macronova. We searched for coincident neutrino events in the range from 3.5 MeV to ∼100 PeV, in a time window ±500 s around the gravitational wave detection time, as well as during a 14-day period after the detection. No significant neutrino signal was observed for either time window. We calculated 90% confidence level upper limits on the neutrino fluence for GW170817. From the upward-going-muon events in the energy region above 1.6 GeV, the neutrino fluence limit is () cm -2 for muon neutrinos (muon antineutrinos), with an error range of ±5around the zenith angle of NGC4993, and the energy spectrum is under the assumption of an index of-2. The fluence limit for neutrino energies less than 100 MeV, for which the emission mechanism would be different than for higher-energy neutrinos, is also calculated. It is 6.6 × 10 7 cm -2 for anti-electron neutrinos under the assumption of a Fermi-Dirac spectrum with average energy of 20 MeV.

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