Intensive monitoring of OJ 287

We present intensive optical, infrared, and radio monitoring observations o f the BL Lac object OJ 287, taken between the years 1993-1998. Two large op tical outbursts were detected at the predicted times in November 1994 and D ecember 1995. The detection of these outbursts supports the binary black ho le model for OJ 287. Optical and radio polarisation observations show large variability in the degree of polarisation and position angle, very similar to those observed during the 1983/84 outburst in OJ 287. The polarisation position angles show very similar behaviour during these observations, indi cating that, at: least, the magnetic field orientations in radio and optica l bands are related in OJ 287. Optical and infrared light curves show conti nuous variability in time scales ranging from tens of minutes to years. In the radio bands we have observed some of the lowest ever measured flux leve ls. During the first optical outburst in November 1994 the observed radio f lux was very low, but during the second optical outburst radio bands also s howed high flux levels. This is a puzzling observation, which can hopefully be used for discriminating between different outburst models. On top of th e large outbursts OJ 287 has displayed flaring activity in time scales from days to weeks and shorter time scale flickering.