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Analyzing single-dish and VLBI radio, as well as Fermi-LAT $\gamma$-rayobservations, we explained the three major $\gamma$-ray flares in the$\gamma$-ray light curve of FSRQ J1048+7143 with the spin-orbit precession ofthe dominant mass black hole in a supermassive black hole binary system. Here,we report on the detection of a fourth $\gamma$-ray flare from J1048+7143,appearing in the time interval which was predicted in our previous work. Usingthe updated analysis covering the time range between 2008 Aug 4 and 2023 Jun 4,we further constrain the parameters of the hypothetical supermassive binaryblack hole at the heart of J1048+7143 and we predict the occurrence of thefifth major $\gamma$-ray flare that would appear only if the jet will still layclose to our line sight. The fourth major $\gamma$-ray flare also shows thetwo-subflare structure, further strengthening our scenario in which theoccurrence of the subflares is the signature of the precession of aspine-sheath jet structure that quasi-periodically interacts with a protontarget, e.g. clouds in the broad-line region.

Narrowing down the parameters for the supermassive black hole binary in J1048+7143