Abstract
An analysis of multicolor photometric observations of BL Lac performed at the Astronomical Institute of Saint Petersburg State University was carried out to determine the color characteristics of the variable sources responsible for the activity of this object. The existence of two variable synchrotron components has been established. One is responsible for small flux variations at low flux levels, and the second for outbursts. The outbursts are associated with the propagation of shocks in the jet.
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