A&A Supplement series, Vol. 127, February I 1998, 445-454
Received February 5; accepted June 5, 1997
-ray loud
blazars
C.M. Raiteri
, G. Ghisellini
, M. Villata,
G. De Francesco,
L. Lanteri, M. Chiaberge
, A. Peila,
and G. Antico
Send offprint request: C.M. Raiteri (raiteri@to.astro.it)
Osservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino
Torinese (TO), Italy
Osservatorio Astronomico di Brera, Via Bianchi 46, I-22055 Merate, Italy
Istituto di Fisica Generale dell'Università, Via Pietro Giuria 1, I-10125
Torino, Italy
New data from the optical monitoring of -ray loud blazars at
the Torino Astronomical Observatory are presented. Observations have been taken
in the Johnson's B, V, and Cousins' R bands with the 
REOSC
telescope equipped with a 
pixel CCD camera. Many of the 22
monitored sources presented here show noticeable magnitude variations. Periods
corresponding to pointings of the Energetic Gamma Ray Experiment Telescope
(EGRET) on the Compton Gamma Ray Observatory (CGRO) satellite are indicated on
the light curves. The comparison of our data with those taken by CGRO in the
-ray band will contribute to better understand the mechanism of the
-ray emission. We finally show intranight light curves of 3C 66A and OJ
287, where microvariability was detected.
keywords: galaxies: active -- BL Lacertae objects: general -- quasars: general