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The Be/X-ray binary A 0535+26 showed a normal (type I) outburst in August2009. It is the fourth in a series of normal outbursts associated with theperiastron, but is unusual by presenting a double-peaked light curve. The twopeaks reached a flux of ~450 mCrab in the 15-50 keV range. We present resultsof the timing and spectral analysis of INTEGRAL, RXTE, and Suzaku observationsof the outburst. The energy dependent pulse profiles and their evolution duringthe outburst are studied. No significant differences with respect to othernormal outbursts are observed. The centroid energy of the fundamental cyclotronline shows no significant variation during the outburst. A spectral hardeningwith increasing luminosity is observed. We conclude that the source isaccreting in the sub-critical regime. We discuss possible explanations for thedouble-peaked outburst.

A double-peaked outburst of A 0535+26 observed with INTEGRAL, RXTE, and Suzaku