Light-curves from observations at different wavelengths. From top to bottom: i) H.E.S.S. period-by-period integral-flux above 310 GeV. The dashed line is the mean flux level. The vertical bars give the statistical errors. ii) Fermi-LAT flux in the 300 MeV–300 GeV energy range. For time bins where the test-statistic is below 4, an upper limit at 95% confidence level is reported. iii) Swift-XRT flux in the 0.3−10 keV band. iv) Swift-UVOT measurement in U and UVW2 bands. v) ATOM magnitudes in the B and R bands. The insets of panel iii and iv present a zoom in time around the Swift observations.