Swift-BAT light curve showing the 2011 December and the 2012 August outburst, which occurred as predicted by the orbital ephemeris (green region), and the unexpected flaring activity after this outburst (blue region) followed by a giant type II outburst at an orbital phase of nearly 0.3 (red region). Times of observation by Swift (red) and Suzaku (green) are shown as arrows on top (compare Table 1). The inset shows the epoch-folding result of the flaring part of the light curve.