Earth Occultation Imaging of the Low Energy Gamma-ray Sky with GBM

The Earth Occultation Technique (EOT) has been applied to the Fermi Gamma-ray Burst Monitor (GBM) to perform all-sky monitoring of a predetermined catalog of hard X-ray/soft gamma-ray sources. Imaging with a Differential filter using the Earth Occultation Method (IDEOM) has been developed to search for sources absent from the GBM catalog in order to complete the catalog and reduce a source of systematic error in the EOT analysis. With IDEOM, projections of the Earth's limb on the sky from the occultation of a source can be combined. These projections add constructively over the course of Fermi's orbital precession and thus localized a source. We present all-sky images that have been generated with IDEOM for ~ 4 years of GBM in the 12-50 keV, 50-100, and 100-300 keV energy ranges and the ~ 20 sources that have been added to the input source catalog through this method.