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We report on the location of the gamma-ray emission region in flares of theBL Lacertae object OJ287 at >14pc from the central supermassive black hole. Weemploy data from multi-spectral range (total flux and linear polarization)monitoring programs combined with sequences of ultra-high-resolution 7mm VLBAimages. The correlation between the brightest gamma-ray and mm flares is foundto be statistically significant. The two gamma-ray peaks, detected byFermi-LAT, that we report here happened at the rising phase of twoexceptionally bright mm flares accompanied by sharp linear polarization peaks.The VLBA images show that these mm flares in total flux and polarization degreeoccurred in a jet region at >14pc from the innermost jet region. The timecoincidence of the brighter gamma-ray flare and its corresponding mm linearpolarization peak evidences that both the gamma-ray and mm outbursts occur>14pc from the central black hole. We find two sharp optical flares occurringat the peak times of the two reported gamma-ray flares. This is interpreted asthe gamma-ray flares being produced by synchrotron self-Compton scattering ofoptical photons from the flares triggered by the interaction of moving knotswith a stationary conical shock in the jet.

Gamma-ray emission region located in the parsec scale jet of OJ287