The gamma-ray brightest days of the blazar 3C 454.3
  In the first week of December 2009, the blazar 3C 454.3 became the brightest
high energy source in the sky. Its photon flux reached and surpassed the level
of 1e-5 ph/cm2/s above 100 MeV. The Swift satellite observed the source several
times during the period of high gamma-ray flux, and we can construct really
simultaneous spectral energy distributions (SED) before, during, and after the
luminosity peak. Our main findings are: i) the optical, X-ray and gamma-ray
fluxes correlate; ii) the gamma-ray flux varies quadratically (or even more)
with the optical flux; iii) a simple one-zone synchrotron inverse Compton model
can account for all the considered SED; iv) in this framework the gamma-ray vs
optical flux correlation can be explained if the magnetic field is slightly
fainter when the overall jet luminosity is stronger; v) the power that the jet
spent to produce the peak gamma-ray luminosity is of the same order, or larger,
than the accretion disk luminosity. During the flare, the total jet power
surely surpassed the accretion power.
