Here is the light curve of a typical type II-P supernova, from the paper by Kasen and Woosley (as cited in a previous post)
It is most remarkable how the visual (V-band), red (R-band), and near-infrared (I-band) light of a typical Type II-P Supernova stays constant for a long time. In contrast, the Blue (B-band) light falls off steadily, and the very-near-ultraviolet (U-band) light falls off rapidly.
The strong pulse of U-band (very near ultraviolet) light at the very beginning of the supernova event also looks extremely interesting.
These "exploding critters" do some strange things!