Light curves of MAGIC, Swift/BAT, RXTE/ASM, GASP-WEBT, Metsähovi and OVRO from top to bottom in the time range from February 2007 to July 2009. The vertical dotted black lines denote the position of the TeV γ-ray flares as identified with the Bayesian Block algorithm (see Sect. 3). The vertical black lines mark the division between the three time periods (Period 1, Period 2, Period 3).