Search for Neutrinos in Super-Kamiokande Associated with the GW170817 Neutron-star Merger
© 2018. The American Astronomical Society. All rights reserved. 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 × 107 cm-2 for anti-electron neutrinos under the assumption of a Fermi-Dirac spectrum with average energy of 20 MeV.
Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Iyogi, K; Kameda, J; Kato, Y; Kishimoto, Y; Marti, L; Miura, M; Moriyama, S; Nakahata, M; Nakajima, Y; Nakano, Y; Nakayama, S; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Takeda, A; Takenaka, A; Tanaka, H; Tasaka, S; Yano, T; Akutsu, R; Kajita, T; Nishimura, Y; Okumura, K; Tsui, KM; Labarga, L; Fernandez, P; Blaszczyk, FDM; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Sulak, LR; Berkman, S; Tobayama, S; Bian, J; Elnimr, M; Kropp, WR; Locke, S; Mine, S; Weatherly, P; Smy, MB; Sobel, HW; Takhistov, V; Ganezer, KS; Hill, J; Kim, JY; Lim, IT; Park, RG; Li, Z; O'Sullivan, E; Scholberg, K; Walter, CW; Gonin, M; Imber, J; Mueller, TA; Ishizuka, T; Nakamura, T; Jang, JS; Choi, K; Learned, JG; Matsuno, S; Amey, J; Litchfield, RP; Ma, WY; Uchida, Y; Wascko, MO; Catanesi, MG; Intonti, RA; Radicioni, E; Rosa, GD; Ali, A; Collazuol, G; Ludovici, L
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