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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 (Agrupaciˇ Astron˛mica de Sabadell, Spain), M. Villata and C.M. Raiteri (INAF, Osservatorio Astronomico di Torino, Italy)
on 24 Sep 2007; 9:33 UT
Password Certification: Claudia M. Raiteri (email@example.com)
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.