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3C 454.3 is the most variable and intense extragalactic gamma-ray blazardetected by AGILE and Fermi during the last 4 years. This remarkable sourceshows extreme flux variability (about a fact or of 20) on a time-scale of 24-48hours, as well as repeated flares on a time-scale of more than a year. Thedynamic range, from the quiescence up to the most intense gamma-raysuper-flare, is of about two orders of magnitude. We present the gamma-rayproperties of 3C 454.3, comparing both the characteristics of flares atdifferent levels and their multi-wavelength behavior. Moreover, aninterpretation of both the long- and short-term properties of 3C 454.3 isreviewed, with particular emphasis on the two gamma-ray super-flares observedin 2009 and 2010, when 3C 454.3 became the brightest source of the wholegamma-ray sky.

The gamma-ray flaring properties of the blazar 3C 454.3