Fig. 1.
CTA 102 light curves during the 2016–17 flare. (a) Fermi-LAT (0.1−300 GeV) light curve. The black line gives the optimal block representation of the light curve. A peak is considered to be significant if the block height is greater than a set threshold. (b) Optical R band light curve and its optimal block representation. The QPO peaks are denoted by red arrows. (c) γ-ray and R-band emission DCF. (d) Optical polarization angle during the detected QPO.
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