Abstract
Abstract In 2007 July, the blazar 3C 454.3 underwent a flare in the optical, reaching R∼ 13 on July 19. Then the optical flux decreased by one magnitude, being R∼ 14 when the source was detected by the gamma-ray satellite AGILE, which observed the source on July 24–30. At the same time, the Swift satellite performed a series of snapshots. We can construct the simultaneous spectral energy distribution using optical, ultraviolet, X-ray and gamma-ray data. These show that an increased gamma-ray flux is accompanied by a weaker optical/X-ray flux with respect to the flare observed in the spring of 2005 by INTEGRAL and Swift. This confirms earlier suggestions about the behaviour of the jet of 3C 454.3.
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