Non-gray, Month-long Brightening of KIC 8462852 in the Immediate Aftermath of a Deep Dip

We present an analysis of the results of long-term, multi-band photometric monitoring of the enigmatic star, KIC 8462852. Observations in the B, g', V, r', and I-C passbands have been acquired at University College London Observatory between 2017 May and 2018 September. We interrogate the wavelength dependence of the similar to month-long dimming and brightening exhibited by the target star over an 85 day interval, immediately following a dayslong similar to 5% drop in brightness on Julian Date (JD) 2,458,203. Between JD 2,458,215-300 we measure brightness variations which correspond to relative extinctions of A(B)/A(V) = 1.39 +/- 0.27, A(g')/A(V) = 1.16 +/- 0.11, A(r')/A(V) = 0.80 +/- 0.25 and A(Ic)/A(V) = 0.49 +/- 0.19, from which we infer an Angstrom absorption coefficient of 1.33 +/- 0.43 (R-V similar or equal to 3.2(-1.0)(+2.6)). As with the days-long "dips", the wavelength dependence of the longer-term brightness variations must also be associated with extinction arising from a dust distribution containing a substantial fraction of submicron-sized grains. This implies some common mechanism is responsible for the star's variability over both these short and longer timescales.