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In this work we explore the short-term optical variability of 3C 454.3 during its outburst by searching for time delays between different optical bands. Finding one would be important for understanding the evolution of the spectrum of the relativistic electrons, which generate the synchrotron jet emission.\n  Methods. We performed photometric monitoring of the object by repeating exposures in different optical bands (BVRI). Occasionall","authors_text":"A. C. Gupta, A. Lalova, A. Strigachev, A. Valcheva, B. Mihov, E. Ovcharov, E. Semkov, R. Bachev, S. 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