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GeV gamma ray is an important observation target of DArk Matter ParticleExplorer (DAMPE) for indirect dark matter searching and high energyastrophysics. We present in this work a set of accurate instrument responsefunctions of DAMPE (DmpIRFs) including the effective area, point-spreadfunction and energy dispersion that are crucial for the gamma-ray data analysisbased on the high statistics simulation data. A dedicated software named DmpSTis developed to facilitate the scientific analyses of DAMPE gamma-ray data.Considering the limited number of photons and the angular resolution of DAMPE,the maximum likelihood method is adopted in the DmpST to better disentangledifferent source components. The basic mathematics and the framework regardingthis software are also introduced in this paper.

DmpIRFs and DmpST: DAMPE Instrument Response Functions and Science Tools for Gamma-Ray Data Analysis