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The black hole system 1E${\thinspace}$1740.7$-$2942 is usually the brightesthard X-ray source (above 20 keV) near the Galactic Center, but presents someepochs of low emission (below the INTEGRAL detection limit, for example). Inthis work, we present the results of studies on 1E${\thinspace}$1740.7$-$2942over 10 years, using the instruments ISGRI/IBIS and JEM-X, both on board theINTEGRAL observatory. We fit the spectra with both the compTT and cutoffplmodels. According to the fits and taking the mean value over the 10 years, wehave obtained a plasma temperature in the range $\sim$20$\,-\,$90$\thinspace$keV, and an average powerlaw index of 1.41 ($\sigma$=0.25). We have also made aLomb$\,-\,$Scargle periodogram of the flux in the 50$\,-\,$20${\thinspace}$keVband and found two tentative periods at 2.90 and 3.99${\thinspace}$days. Wepresent here the preliminary results of this ongoing work.

Flux and spectral variations of 1E${\thinspace}$1740.7$-$2942 over the years 2003$-$2012