Search for Astronomical Neutrinos from Blazar TXS0506+056 in Super-Kamiokande
2019
We report a search for astronomical neutrinos in the energy region from several GeV to TeV in the direction of the
blazarTXS0506+056 using the
Super-Kamiokandedetector following the detection of a 100 TeV neutrino from the same location by the IceCube collaboration. Using
Super-Kamiokandeneutrino data across several data samples observed from April 1996 to February 2018 we have searched for both a total excess above known backgrounds across the entire period as well as localized excesses on smaller time scales in that interval. No significant excess nor significant variation in the observed event rate are found in the
blazardirection. Upper limits are placed on the electron and
muon neutrinofluxes at 90\% confidence level as $6.03 \times 10^{-7}$ and $4.52 \times 10^{-7}$ to $9.26 \times 10^{-10}$ [${\rm erg}/{\rm cm}^2/{\rm s}$], respectively.
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