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A normal outburst of the Be/X-ray binary system A0535+26 has taken place inAugust 2009. It is the fourth in a series of normal outbursts that have occuredaround the periastron passage of the source, but is unusual by starting at anearlier orbital phase and by presenting a peculiar double-peaked light curve. Afirst "flare" (lasting about 9 days from MJD 55043 on) reached a flux of 440mCrab. The flux then decreased to less than 220 mCrab, and increased againreaching 440 mCrab around the periastron at MJD 55057. Target of Opportunityobservations have been performed with INTEGRAL, RXTE and Suzaku. First resultsof these observations are presented, with special emphasis on the cyclotronlines present in the X-ray spectrum of the source, as well as in the pulseperiod and energy dependent pulse profiles of the source.

Peculiar outburst of A 0535+26 observed with INTEGRAL, RXTE and Suzaku