Institution:
Instituto de Astronomia, UNAM, Apdo. Postal, 70-264, 04510 Mexico D.F., Mexico
Tuorla Observatory, Tuorla, FIN-21500 Piikkio, Finland

Title of the communication: Microvariability in OJ 287 during a flare
Preliminary abstract (12 lines max.):
We present microvariability observations of OJ 287, taken during a small flare in January 1994. We can follow the behaviour of OJ 287 during the whole flare. The event has a synchrotron flare shape, with a steep ingress and slower egress, and a double peak structure most likely due to two similar flares occuring a day apart. Microvariability is observed on top of this flare during five nights, out of ten. Two types of microvariability events can be identified: smaller flares and smoother sinusoidal variations. The time scales are of the order of minutes to hours. We do not find any periodical or quasi-periodical variations. A brief discussion on the possible mechanisms responsible for the different scales and types of variability is given.