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GASP detection of an optical flare of the blazar S5 0716+71

ATel #1223; D. Carosati (Armenzano Astronomical Observatory, Assisi, Italy), V. M. Larionov and L. Larionova (Astronomical Institute, St.-Petersburg State University and Pulkovo Observatory, St. Petersburg, Russia), J. A. Ros (Agrupació Astronòmica de Sabadell, Spain), M. Villata and C. M. Raiteri (INAF, Osservatorio Astronomico di Torino, Italy)
on 24 Sep 2007; 09:33 UT
Credential Certification: Claudia M. Raiteri (raiteri@oato.inaf.it)

Subjects: Optical, AGN

With reference to ATEL #1221 announcing the possible detection at gamma-ray energies of the blazar S5 0716+71, the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) reports on the observation of an optical flare of this blazar in the same period. The source brightened from R = 12.92 +/- 0.01 on September 8 to R = 12.58 +/- 0.04 on September 12, it was R = 12.60-12.65 the day after, and faded to R = 13.01-13.03 on September 15, 2007.