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The flat-spectrum radio quasar 3C 454.3 is well known to be a highly activeand variable source with outbursts occurring across the whole electromagneticspectrum over the last decades. In spring 2005, 3C 454.3 has been reported toexhibit a strong optical outburst which subsequently triggered multi-frequencyobservations of the source covering the radio up to gamma-ray bands. Here, wepresent first results of our near-IR/optical (V, R, I, H band) photometryperformed between May 11 and August 5, 2005 with the Rapid Eye Mount (REM) atLa Silla in Chile and the Automatic Imaging Telescope (AIT) of the PerugiaUniversity Observatory. 3C 454.3 was observed during an exceptional andhistorical high state with a subsequent decrease in brightness over our 86 daysobserving period. The continuum spectral behaviour during the flaring anddeclining phase suggests a synchrotron peak below the near-IR band as well as ageometrical origin of the variations e.g. due to changes in the direction offorward beaming.Comment: 5 pages, 3 figures, accepted for publication in A&A Letter

A rapid and dramatic outburst in Blazar 3C 454.3 during May 2005