Neutrino Cadence of TXS 0506+056 Consistent with Supermassive Binary Origin

On September 18, 2022, an alert by ceCube indicated that a ~170TeV neutrino arrived in directional coincidence with the blazar TXS 0506+056. This event adds to two previous ones: from its direction on 22, 2017, and 3sigma signature of dozen neutrinos 2014/2015. deBruijn 2020 showed these emission episodes could be due supermassive binary black hole (SMBBH) where jet precession close final coalescence results periodic emission. model predicted new episode consistent 2022 observation. Here, we show cadence 0506+056 is SMBBH origin mass ratios q<0.3 for total M>3e8Msun. For first time, calculate characteristic strain gravitational wave binary, merger detectable LISA masses <5e8Msun if are range 0.1<q<0.3. We predict there can flare existing still analyzed IceCube data peaking some time between 08/2019 01/2021 precessing responsible all three detected episodes. The next expected peak period 01/2023 08/2026. Further observation will make it possible constrain ratio as function more precisely would open window toward preparation detection mergers.