Blazar TXS 0506+056, the only known source of high energy neutrinos, shows clear sign of variability, but is quiet in high energies

Long term observations of blazar TXS 0506+056 show no detections in very high energy (VHE) gamma rays. However the source displays clear variability in other parts of the electromagnetic spectrum (gamma, x-ray, optical).

Blazar TXS 0506+056 is the only known source of high energy neutrinos. In 2017 IceCube observatory in Antarctica detected high energy neutrino which was located to TXS 0506+056. Follow-up observation with Fermi telescope in orbit found VHE gamma rays comming from the source.

New observations from october 2018 to march 2021 by VERITAS (Very Energetic Radiation Imaging Telescope Array System) in Arizona show no VHE gamma rays. However the source is clearly variable on other, less-energetic parts of the spectrum.

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