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Convincing evidence for long-term variations in the emission properties ofthe anomalous X-ray pulsar 1RXS J170849.0-400910 has been gathered in the lastfew years. In particular, and following the pulsar glitches of 1999 and 2001,XMM-Newton witnessed in 2003 a decline of the X-ray flux accompanied by adefinite spectral softening. This suggested the existence of a correlationbetween the luminosity and the spectral hardness in this source, similar tothat seen in the soft gamma-repeater SGR 1806-20. Here we report on new Chandraand Swift observations of 1RXS J170849.0-400910 performed in 2004 and 2005,respectively. These observations confirm and strengthen the proposedcorrelation. The trend appears to have now reversed: the flux increased and thespectrum is now harder. The consequences of these observations for the twistedmagnetosphere scenario for anomalous X-ray pulsars are briefly discussed.Comment: 6 pages, 5 figures, accepted for publication on A&

SwiftandChandraconfirm the intensity-hardness correlation of the AXP 1RXS J170849.0–400910