XMM–Newton  and INTEGRALanalysis of the Supergiant Fast X-ray Transient IGR J17354−3255.

We present the results of combined INTEGRAL and XMM–Newton   observations of the supergiant fast X-ray transient (SFXT) IGR J17354−3255. Three XMM–Newton   observations of lengths 33.4, 32.5, and 21.9 ks were undertaken, the first an initial pointing to identify the correct source in the field of view and the latter two performed around periastron. Simultaneous INTEGRAL observations across |${\sim }66\,{\rm {per \, cent}}$| of the orbital cycle were analysed but the source was neither detected by IBIS/ISGRI nor by JEM-X. The XMM–Newton  light curves display a range of moderately bright X-ray activity but there are no particularly strong flares or outbursts in any of the three observations. We show that the spectral shape measured by XMM–Newton  can be fitted by a consistent model throughout the observation, suggesting that the observed flux variations are driven by obscuration from a wind of varying density rather than changes in accretion mode. The simultaneous INTEGRAL data rule out simple extrapolation of the simple power-law model beyond the XMM–Newton  energy range. [ABSTRACT FROM AUTHOR]