INTENSE BLAZAR ACTIVITY IN THE PHOTOPOLARIMETRIC LIGHT-CURVE OF OJ-287

We present a detailed analysis on photopolarimetric monitoring on OJ 2 87 conducted at the Nordic Optical Telescope during January 1991. Larg e rapid variations were observed in flux, polarization and position an gle; the largest being a 40% increase in the flux with a simultaneous 55 degree position angle rotation in five hours. Changes in the wavele ngth dependent polarization and position angle were observed in timesc ales of hours. Several different models have been considered in explai ning the observations. The standard two-component model or the shock i n the jet model cannot explain all the observed variations, although m any of the observed effects can be explained using a two-component mod el. Models with relativistic beaming effects or changes in the accreti on disk can be used to explain these observations.