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We report the discovery of a cyclotron resonance scattering feature (CRSF) inthe X-ray spectrum of GX 304-1, obtained by RXTE and Suzaku during majoroutbursts detected by MAXI in 2010. The peak intensity in August reached 600mCrab in the 2-20 keV band, which is the highest ever observed from thissource. The RXTE observations on more than twenty occasions and one Suzakuobservation revealed a spectral absorption feature at around 54 keV, which isthe first CRSF detection from this source. The estimated strength of surfacemagnetic field, $4.7 \times 10^{12}$ G, is one of the highest among binaryX-ray pulsars from which CRSFs have ever been detected. The RXTE spectra takenduring the August outburst also suggest that the CRSF energy changed over 50-54keV, possibly in a positive correlation with the X-ray flux. The behavior isqualitatively similar to that observed from Her X-1 on long time scales, orfrom A 0535+26, but different from the negative correlation observed from 4U0115+63 and X 0331+53.

Discovery of a Cyclotron Resonance Feature in the X-ray Spectrum of GX 304-1 with RXTE and Suzaku during Outbursts Detected by MAXI in 2010