Search for Astronomical Neutrino from Blazar TXS0506+056 in Super-Kamiokande
July 22, 2019
Astronomical neutrinos from the direction of the blazar TXS0506+056 were searched in the Super-Kamiokande (SK). A high-energy neutrino event that seems to originate from the blazar was observed in the IceCube experiment at September 2017. Since SK is the largest water Cherenkov detector in the MeV to TeV region, there is a possibility of observing the astronomical neutrino events from the blazar. The experimental data from SK-I to SK-IV spanning a period from April 1996 to February 2018 were used. All events were classified by the interaction point and the energy. The upward-going muon sample was explored within 5 degrees around the location of the blazar. The fully-contained and partially-contained samples within a 10 degrees search circle were used. No significant excess was found in all types of events from the Kolmogorov-Smirnov test.
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