RXTE/PCA and Swift/XRT observations of GRO J1655-40 during decay

Astronomy and Astrophysics – Astronomy

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X-Ray, Binaries, Black Holes, Transients

Scientific paper

Following its transition to the hard state (ATels #607,#612), we have continued our daily RXTE/PCA observations of the black hole X-ray transient GRO J1655-40 (see http://tahti.mit.edu/opensource/1655). Between September 23, when the source reached the hard state, and October 10, the RXTE/ PCA count rate decreased exponentially, with an e-folding time of ~7 days. After October 10 the decrease started to slow down and data from the last few days suggest that the count rate may have reached a constant level.

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