Light curves of MOS 1 (red curve, bin size 150 s) and OM in the UVM2 filter (blue curve, bin size 10 s). The OM rate is scaled down by a factor 30 to allow a direct comparison of the rise and decay times of both instruments during the flares. The time intervals used for time resolved spectroscopy (see Sect. 3.2) are indicated by the alternating light or dark gray areas and numbered on top of each panel.