Multifrequency monitoring of blazars OJ 287 and 3C 66A

We present preliminary results from an intensive multifrequency monitoring of blazars OJ 287 and 3C 66A. In both blazars we observe continuous small amplitude variability in time scales of days. This is the first time that such continuous variations have been observed. 3C 66A has been in outburst, being about one magnitude brighter than during the previous observations. In OJ 287 we observed a large outburst in November 1994, that lasted about three months. This outburst occured almost at the’predicted time (Sillanpaa et al. 1988), confirming the 12 year periodicity in this blazar. Mem. S.A.It., 1996 Vol. 67° 1/2 545