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The Energetic X-ray Imaging Survey Telescope (EXIST) mission concept isoptimized for study of high-z GRBs as probes of the early Universe. With a HighEnergy Telescope (HET) incorporating a 4.5m^2 5-600keV (CZT; 0.6mm pixels)detector plane for coded aperture imaging a 90deg x 70deg (>10% codingfraction) field of view with 2' resolution and <20" (90% conf.) positions for>5 sigma sources, EXIST will perform rapid (<200sec) slews onto GRBs. Promptimages and spectra are obtained with a co-aligned soft X-ray telescope (SXI;0.1 - 10keV) and with a 1.1m optical-IR telescope (IRT) simultaneously in 4bands (0.3 - 0.52micron, 0.52 - 0.9micron, 0.9 - 1.38micron, and 1.38 -2.3micron). An initial image (100s) will yield prompt identification within theHET error circle from a <2" prompt SXI position; or from VIS vs. IR dropouts orvariability. An autonomous spacecraft re-point (<30") will then put the GRB ona 0.3" x 4" slit for either R = 3000 (for AB <21) or R =30 (for AB ~21-25)prompt spectra over the 0.3 - 0.9 micron and 0.9 - 2.3 micron bands. This willprovide onboard redshifts within ~500-2000sec for most GRBs, reaching z ~20(for Lyman-alpha breaks) if such GRBs exist, and spectra for studies of thehost galaxy and local re-ionization patchiness as well as intervening cosmicstructure. With ~600 GRBs/yr expected, including ~7-10% expected at z >7, EXISTwill open a new era in studies of the early Universe as well as carry out arich program of AGN and transient-source science. An overview of the GRBscience objectives and a brief discussion of the overall mission design andoperations is given, and example high-z GRB IRT spectra are shown. EXIST isbeing proposed to the Astro2010 Decadal Survey as a 5 year Medium Class missionthat could be launched as early as 2017.

GRB Probes of the High-z Universe with EXIST