Abstract We report results of our optical photometric observations of ten gamma-ray loud blazers, namely: 0219+428 (3C66A), PKS 0420--014 (OA 129), S5 0716+714, 0754+100 (OI 090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+420 (BL Lacertae), 2230+114 (CTA 102), 2251+158 (3C 454.3) and 2344+514. The observations were carried out in September--October, 2000 using the 70 cm optical telescope at Abstumani Observatory, Georgia. We found intra-day variations in 0420--014, S5 0716+714, BL Lacertae and CTA 102. A variation of 0.3 magnitude over a time scale of about 3 hours was observed in the R passband in BL Lacertae on JD 2451827. We did not detect any variation in 3C 66A, Mrk 501, or 3C 454.3 during our observations. Nor did we detect any clear evidence of variation in 1ES 2344+514 during our two weeks' observing run of the TeV gamma-ray source.

Keywords galaxies: active --- Blazars: individual: PKS 0219+428 (3C 66A), PKS 0420--014 (OAl29), S5 0716+714, 0754+100 (OI090.4), 0827+243 (OJ248), 1652+398 (Mrk 501), 2200+420 (BL Lacertae) , 2230+114 (CTAl02), 2251+158 (3C 454.3), and 1ES 2344+514 --- galaxies: photometry

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