TY CONF TI The results of simultaneous TESS and multiband photometric observations of BL Lac during a high activity KW radiation mechanisms: non-thermal; relativistic processes; techniques: photometric; BL Lacertae objects: individual (BL Lac); galaxies: jets JO Modern astronomy: from the Early Universe to exoplanets and black holes AU Gorbachev, M.. AU Butuzova, M.. AU Pit, N.. AU Krivenko, A.. PY 2024 PB Special Astrophysical Observatory of the Russian Academy of Sciences