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GX 339--4 is a well-known microquasar. In this contribution we show theobtained results with the INTEGRAL and XMM-Newton observatories of the outburstundertaken on 2007. The observations cover spectral evolution from the hard,soft intermediate states to the high/soft state. Spectral hardening correlatedwith the appearance of an skewed Fe line is detected during one of theobservations during the soft intermediate state. In all spectral states jointXMM/EPIC-pn, JEM-X, ISGRI and SPI data were fit with the hybridthermal/non-thermal Comptonization model (EQPAIR). With this model anon-thermal component seems to be required by the data in all the observations.Our results imply evolution in the coronal properties, the most important onebeing the transition from a compact corona in the first observation to thedisappearance of coronal material in the second and re-appearance in the third.We discuss the results obtained in the context of possible physical scenariosfor the origin and geometry of the corona and its relation to black holestates.

The high-energy emission from GX 339-4 as seen with INTEGRAL and XMM-Newton