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The flat-spectrum radio quasar 3C 454.3 underwent an extraordinary 5-daygamma-ray outburst in November 2010 where the daily flux measured with theFermi Large Area Telescope (LAT) at photon energies E>100 MeV reached (66+/-2)x 10^-6 ph cm^-2 s^-1. This is a factor of 3 higher than its previous maximumflux recorded in December 2009 and ~5 times brighter than the Vela pulsar,which is normally the brightest source in the gamma-ray sky. The 3-hr peak fluxwas (85+/-5) x 10^-6 ph cm^-2 s^-1, corresponding to an apparent isotropicluminosity of 2.1+/-0.2 10^50 erg s^-1, the highest ever recorded for a blazar.In this paper, we investigate the features of this exceptional event in thegamma-ray band of the Fermi-LAT. In contrast to previous flares of the samesource observed with the Fermi-LAT, clear spectral changes are observed duringthe flare.

Fermi Gamma-ray Space Telescope Observations of the Gamma-ray Outburst from 3C 454.3 in November 2010