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Published online by Cambridge University Press: 19 July 2016
Using the VLA at 6 cm, we have detected non-periodic variations in the powerful BL Lacertae object OJ287 on timescales between minutes and hours at levels of the order of one percent. Brightness temperatures inferred from causality arguments range from 1016 to 1020 K. No periodic component was found to a limit of 0.1%.