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We performed simultaneous multiwavelength observations of OJ 287 with theNobeyama Millimeter Array for radio, the KANATA telescope and the KVA telescopefor optical, the Suzaku satellite for X-ray and the MAGIC telescope for veryhigh energy (VHE) gamma-ray in 2007. The observations were conducted for aquiescent state in April and in a flaring state in November-December. Weclearly observed increase of fluxes from radio to X-ray bands during theflaring state while MAGIC could not detect significant VHE gamma-ray emissionfrom the source. We could derive an upper limit (95% confidence level) of 1.7%of the Crab Nebula flux above 150 GeV from about 41.2 hours of the MAGICobservation. A simple SSC model suggests that the observed flaring activitycould be caused by evolutions in the distribution of the electron populationrather than changes of the magnetic field strength or Doppler beaming factor inthe jet.

Multiwavelength observation from radio through very-high-energy Gamma-ray of OJ 287 during the 12-year cycle flare in 2007