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Since 2005, the blazar 3C 454.3 has shown remarkable flaring activity at allfrequencies, and during the last four years it has exhibited more than onegamma-ray flare per year, becoming the most active gamma-ray blazar in the sky.We present for the first time the multi-wavelength AGILE, SWIFT, INTEGRAL, andGASP-WEBT data collected in order to explain the extraordinary gamma-ray flareof 3C 454.3 which occurred in November 2010. On 2010 November 20 (MJD 55520),3C 454.3 reached a peak flux (E>100 MeV) of F_gamma(p) = (6.8+-1.0)E-5 ph/cm2/son a time scale of about 12 hours, more than a factor of 6 higher than the fluxof the brightest steady gamma-ray source, the Vela pulsar, and more than afactor of 3 brighter than its previous super-flare on 2009 December 2-3. Themulti-wavelength data make a thorough study of the present event possible: thecomparison with the previous outbursts indicates a close similarity to the onethat occurred in 2009. By comparing the broadband emission before, during, andafter the gamma-ray flare, we find that the radio, optical and X-ray emissionvaries within a factor 2-3, whereas the gamma-ray flux by a factor of 10. Thisremarkable behavior is modeled by an external Compton component driven by asubstantial local enhancement of soft seed photons.

The brightest gamma-ray flaring blazar in the sky: AGILE and multi-wavelength observations of 3C 454.3 during November 2010