Multiband light curve for PKS 0446+11, shown for the time range around the high energy neutrino arrival time. From top to bottom: Gamma ray, X-ray, optical, and radio light curves. They are supplemented by RATAN spectral index α, calculated for S ∝ ν^+α between 5 and 22 GHz, and electric vector position angle (EVPA) of the parsec-scale core at 15 GHz, with a gray stripe of a 90° width. Uncertainties are shown as 1σ values. The IceCube-240105A neutrino event epoch is shown by the vertical dashed red line. See details in Section 2 and Appendix A.