Left: light curves based on VVV(X) (black) and (NEO)WISE photometry (W1 – blue, and W2 – red) as well as 6.7 GHz total maser flux (green, Green et al. 2015; MacLeod et al. 2021). Vertical red and blue lines mark the dates of the burst onset and first flare evidence from the 6.035 GHz exOH maser (MacLeod et al. 2021). The K_s rise was approximated by a polynomial, while its decay is roughly linear on a log scale (dashed line). The (NEO)WISE magnitudes are shifted to match those of K_s. The integrated maser flux is shown on a log scale (right ordinate). Its scatter is due to the short-term periodicity. Right: K_s (black), i (blue), and z (green) light curves, with i and z magnitudes shifted to match those of K_s. The z pre- and post-magnitudes agree within the errors.