Abstract

Abstract Soft Gamma-ray Repeaters exhibit pulse profile changes in connection with their burst activity. We present the first detailed history of the pulse profile evolution of two SGRs using a large set of RXTE/PCA observations spanning ∼5 years, and we examine their evolution with energy. This study allows us to investigate the burst induced changes of the pulse profiles, and the pulsed count rates (proportional to the pulsed X-ray intensity) during the burst activity or in quiescence.

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