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P.P. Altice, M.L. Cherry, T.G. Guzik, S.C. Kappadath (LSU, Baton Rouge), J.G. Stacy (LSU, Southern U.), J. Macri, M.L. McConnell, J.M. Ryan (UNH, Durham), D.L. Band, J.L. Matteson (UCSD, San Diego), T.J. O'Neill, A.D. Zych (UCR, Riverside), J. Buckley, P.L. Hink (Washinton U., St. Louis)
MARGIE (Minute-of-Arc Resolution Gamma-ray Imaging Experiment) is a large area (~104 cm2), wide field-of-view (~1 sr), hard X-ray/gamma-ray (~20--500 keV) coded-mask imaging telescope capable of performing a sensitive survey of both steady and transient cosmic sources. MARGIE has been selected for a NASA mission-concept study for an Ultra Long Duration (100 day) Balloon flight. We describe our program to develop the instrument based on new detector technology of either cadmium-zinc-telluride (CZT) semiconductors or pixellated cesium iodide (CsI) scintillators viewed by fast-timing bi-directional charge-coupled devices (CCDs). The primary scientific objective is to image faint Gamma-Ray Bursts (GRB) in near-real-time at the low intensity end (high-redshift) of the logN--logS distribution, thereby extending the sensitivity of present observations. Other high-priority scientific goals include a wide field survey of the Galactic center, mapping the distribution of the Galactic 511 keV emission and performing high-resolution spectral and temporal studies of active galaxies.
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