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CTA 102, classified as a flat spectrum radio quasar at z=1.037, producedexceptionally bright optical flare in 2012 September. Following Fermi-LATdetection of enhanced gamma-ray activity, we densely monitored this source inthe optical and near-infrared bands for the subsequent ten nights using twelvetelescopes in Japan and South-Africa. On MJD 56197 (2012 September 27, 4-5 daysafter the peak of bright gamma-ray flare), polarized flux showed a transientincrease, while total flux and polarization angle remained almost constantduring the "orphan polarized-flux flare". We also detected an intra-night andprominent flare on MJD 56202. The total and polarized fluxes showed quitesimilar temporal variations, but PA again remained constant during the flare.Interestingly, the polarization angles during the two flares were significantlydifferent from the jet direction. Emergence of a new emission component withhigh polarization degree (PD) up to 40% would be responsible for the observedtwo flares, and such a high PD indicates a presence of highly ordered magneticfield at the emission site. We discuss that the well-ordered magnetic field andeven the observed directions of polarization angle which is grosslyperpendicular to the jet are reasonably accounted for by transverse shock(s)propagating down the jet.

Dense optical and near-infrared monitoring of CTA 102 during high state in 2012 with OISTER: Detection of intra-night "orphan polarized flux flare"