Search for Neutrinos in Super-Kamiokande associated with Gravitational Wave Events GW150914 and GW151226

2016
We report the results from a search in Super-Kamiokandefor neutrinosignals coincident with the first detected gravitational waveevents, GW150914 and GW151226, using a neutrinoenergy range from 3.5 MeV to 100 PeV. We searched for coincident neutrinoevents within a time window of $\pm$500 seconds around the gravitational wavedetection time. Four neutrinocandidates are found for GW150914 and no candidates are found for GW151226. The remaining neutrinocandidates are consistent with the expected background events. We calculated the 90\% confidence level upper limits on the combined neutrino fluencefor both gravitational waveevents, which depends on event energy and topologies. Considering the upward going muondata set (1.6 GeV - 100 PeV) the neutrino fluencelimit for each gravitational waveevent is 14 - 37 (19 - 50) cm$^{-2}$ for muon neutrinos( muonantineutrinos), depending on the zenithangle of the event. In the other data sets, the combined fluencelimits for both gravitational waveevents range from 2.4$\times 10^{4}$ to 7.0$\times 10^{9}$ cm$^{-2}$.
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