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In this Letter we present results from INTEGRAL and RXTE observations of thespectral and timing behavior of the High Mass X-ray Binary A 0535+26 during itsAugust/September 2005 normal (type I) outburst with an average fluxF(5-100keV)~400mCrab. The search for cyclotron resonance scattering features(fundamental and harmonic) is one major focus of the paper. Our analysis isbased on data from INTEGRAL and RXTE Target of Opportunity Observationsperformed during the outburst. The pulse period is determined. X-ray pulseprofiles in different energy ranges are analyzed. The broad band INTEGRAL andRXTE pulse phase averaged X-ray spectra are studied. The evolution of thefundamental cyclotron line at different luminosities is analyzed. The pulseperiod P is measured to be 103.39315(5)s at MJD 53614.5137. Two absorptionfeatures are detected in the phase averaged spectra at E_1~45keV andE_2~100keV. These can be interpreted as the fundamental cyclotron resonancescattering feature and its first harmonic and therefore the magnetic field canbe estimated to be B~4x10^12G.Comment: 4 pages, 5 figures, accepted for publication in A&A Letter

A 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRAL