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A change in the optical polarization associated with a γ-ray flare in the blazar 3C279

This paper describes multi-frequency observations of the gamma-ray flare in 3C279 which give new evidence on the jet magnetic field and the location of the emission region. One of these data sets was the OVRO-40m monitoring program. I worked on recommissioning the OVRO 40m telescope specifically for this monitoring program. I worked on optimizing the pointing model, the telescope focusing, the data editing and the following aspects of the calibration: the elevation dependence; noise diode correction terms; the long term amplitude stability. I then contributed to improving the purity and reliability of the long term time stream data sets.