GASP detection of a fast optical brightening of the blazar 3C 454.3

Astronomy and Astrophysics – Astronomy

Scientific paper

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Optical, Agn

Scientific paper

With reference to the recent very strong gamma-ray activity of the blazar 3C 454.3 detected by Fermi-GST and AGILE (ATel #2322), the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) reports on a simultaneous fast optical brightening of the source. After the mild activity registered in August-October 2009 (R ~ 14.5-15), the optical brightness decreased to R ~ 15-15.2 in November.

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