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The NaI and BGO detectors on the Gamma ray Burst Monitor (GBM) on Fermi arenow being used for long term monitoring of the hard X-ray/low energy gamma raysky. Using the Earth occultation technique demonstrated previously by the BATSEinstrument on the Compton Gamma Ray Observatory, GBM produces multiband lightcurves and spectra for known sources and transient outbursts in the 8 keV - 1MeV band with its NaI detectors and up to 40 MeV with its BGO. Coverage of theentire sky is obtained every two orbits, with sensitivity exceeding that ofBATSE at energies below ~25 keV and above ~1.5 MeV. We describe the techniqueand present preliminary results after the first ~17 months of observations atenergies above 100 keV. Seven sources are detected: the Crab, Cyg X-1, SwiftJ1753.5-0127, 1E 1740-29, Cen A, GRS 1915+105, and the transient source XTEJ1752-223.

Observations of Soft Gamma Ray Sources >100 keV Using Earth Occultation with GBM