Abstract: We have investigated a slit aperture as an alternative to the square pinhole aperture for the MOXE detectors, which are to be put on the Soviet satellite Spectrum X-Gamma. A slit offers advantages for better discrimination of sources in crowded regions, eliminates the need for support structures for the aperture window, and does not compromise the signal-to-noise (S/N) of a point source. We find that in a single 24 hr pointing of the satellite, MOXE can determine the position of a 10 mCrab source to better than 0.5$DGR with the slit. The structure of a titanium grate that supports the detector's beryllium window constrains the slit to be 0.5 cm $MUL 2.56 cm, oriented at an angle of 26.6$DGR to either side of the center lines of the detector. We illustrate an arrangement of the slits on each of the six detectors, which optimizes source localization for a number of pointings. !4
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