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The microquasar 1E1740.7-2942, also known as the "Great Annihilator", wasobserved by NuSTAR in the Summer of 2012. We have analyzed in detail twoobservations taken ~2 weeks apart, for which we measure hard and smooth spectratypical of the low/hard state. A few weeks later the source flux declinedsignificantly. Nearly simultaneous coverage by INTEGRAL is available from itsGalactic Center monitoring campaign lasting ~2.5 months. These data probe thehard state spectrum from 1E1740.7-2942 before the flux decline. We find goodagreement between the spectra taken with IBIS/ISGRI and NuSTAR, with themeasurements being compatible with a change in flux with no spectralvariability. We present a detailed analysis of the NuSTAR spectral and timingdata and upper limits for reflection of the high energy emission. We show thatthe high energy spectrum of this X-ray binary is well described by thermalComptonization.

NuSTAR and INTEGRAL observations of a low/hard state of 1E1740.7-2942