Multifrequency variability of OJ 287 during the expected outburst

The BL Lac object OJ 287 (z0.306) is a highly variable blazar, which has shownoptical intermittent emission with outstanding pseudoperiodic outbursts every1112 years. Longterm and denselysampled light curves have been collected inthe radio and optical bands since 1891. We aim at studying the spectral andtemporal behaviour of OJ 287, on both long and short time scales, in the radio,mm, optical, UV and Xray band, during the next major outburst, expected tooccur in fall 2006, possibly solving some of the puzzling question about thisAGN. This is a continuation of our previous XMM observations (AO4) proposed todetect the Xray behaviour in high state. Groundbased multifrequency campaignsare already ongoing (WEBT and ENIGMA) joint with VLBI sessions. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]