%0 Conference Article %T The results of simultaneous TESS and multiband photometric observations of BL Lac during a high activity %A Gorbachev, M.. %A Butuzova, M.. %A Pit, N.. %A Krivenko, A.. %K radiation mechanisms: non-thermal; relativistic processes; techniques: photometric; BL Lacertae objects: individual (BL Lac); galaxies: jets %J Modern astronomy: from the Early Universe to exoplanets and black holes %D 2024 %P 3 %I Special Astrophysical Observatory of the Russian Academy of Sciences