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• W1520447008 abstract "The Energetic X‐ray Imaging Survey Telescope (EXIST) mission concept was selected for further study under the Astrophysics Strategic Mission Concept Study (ASMCS) program. The mission design is optimized for study of high‐z GRBs as probes of the early Universe. With a 4.5 m2 imaging 5–600 keV (CZT) detector imaging a 90°×70° (>10% coding fraction) field of view with 2’ resolution and <20” (90% conf.) positions for >5σ sources, EXIST will perform rapid (<200 sec) slews onto GRBs and obtain prompt images and spectra with a co‐aligned soft X‐ray telescope 0.1–10 keV) and with a 1.1 m optical‐IR telescope (IRT) simultaneously in 4 bands (0.3–0.52 μm, 0.52–0.9 μm, 0.9–1.38 μm, and 1.38–2.3 μm) for prompt identification (by dropouts or variability) of the GRB within a 3.75×4.25’ FoV. An autonomous spacecraft re‐point (<2’) will then (at ∼300 sec after GRB trigger) put the GRB on a 0.2×10” slit for either R = 3000 (for AB <21) or R = 30 (for AB ∼21–25) prompt spectra over the 0.3–0.9 μm and 0.9–2.3 μm bands. This will provide onboard redshifts within ∼500–2000 sec for most GRBs, reaching z ∼20 (for Lyman‐α breaks) if such GRBs exist, and spectra for studies of the host galaxy and local re‐ionization bubble as well as intervening cosmic structure. With ∼600 GRBs/yr expected, EXIST will open a new era in studies of the early Universe as well as carry out a rich program of AGN and transient‐source science. An overview of the GRB science objectives and a brief discussion of the overall mission design and operations is given, and example high‐z GRB spectra are shown. EXIST is being proposed to the Astro2010 Decadal Survey as a Medium Class mission that could be launched as early as 2017." @default.
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• W1520447008 date "2009-01-01" @default.
• W1520447008 modified "2023-09-25" @default.
• W1520447008 title "GRB Probes of the High-z Universe with EXIST" @default.
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• W1520447008 doi "https://doi.org/10.1063/1.3155875" @default.
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