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We present detailed spectral and temporal characteristics over the wholeX-ray band. For this purpose data have been used from INTEGRAL, RXTE andXMM-Newton. The INTEGRAL hard X-ray (>10 keV) time-averaged total spectrum, canbe described by a power law with a photon index Gamma = 1.13 +/- 0.06 andextends to ~175 keV. No evidence for a spectral break is found. No significantlong-term time variability has been detected above 20 keV. Pulsed emission ismeasured up to 270 keV (12.3 sigma; 20-270 keV). Three different pulsecomponents can be recognized in the pulse profiles: 1) a hard pulse whichcontributes above ~4 keV, 2) a softer pulse not contributing in the hard X-raydomain and 3) a very soft pulse component below 2 keV. Detailed phase-resolvedspectroscopy of the pulsed emission confirms long-term stability. The spectralshape gradually changes with phase from a soft single power law to a complexmulti-component shape and then to a hard single power law. The spectrumswitches from a very hard (Gamma = 0.99 +/- 0.05) to a very soft (Gamma = 3.58+/- 0.34) single power-law shape within a 0.1-wide phase interval. We identifythree independent components. The three shapes are a soft power law, a hardpower law and a curved shape. The phase distributions of the normalizations ofthese spectral components form three decoupled pulse profiles. The softcomponent peaks around phase 0.4 while the other two components peak aroundphase 0.8. The width of the curved component (~0.25 in phase) is about half thewidth of the hard component.

Detailed high-energy characteristics of AXP 1RXS J170849-400910 - Probing the magnetosphere using INTEGRAL, RXTE and XMM-Newton