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AGILE is a mission of the Italian Space Agency (ASI) Scientific Programdedicated to gamma-ray astrophysics, operating in a low Earth orbit since April23, 2007. It is designed to be a very light and compact instrument, capable ofsimultaneously detecting and imaging photons in the 18 keV to 60 keV X-rayenergy band and in the 30 MeV{50 GeV gamma-ray energy with a good angularresolution (< 1 deg at 1 GeV). The core of the instrument is the SiliconTracker complemented with a CsI calorimeter and a AntiCoincidence systemforming the Gamma Ray Imaging Detector (GRID). Before launch, the GRID neededon-ground calibration with a tagged gamma-ray beam to estimate its performanceand validate the Monte Carlo simulation. The GRID was calibrated using a taggedgamma-ray beam with energy up to 500 MeV at the Beam Test Facilities at theINFN Laboratori Nazionali di Frascati. These data are used to validate a GEANT3based simulation by comparing the data and the Monte Carlo simulation bymeasuring the angular and energy resolutions. The GRID angular and energyresolutions obtained using the beam agree well with the Monte Carlo simulation.Therefore the simulation can be used to simulate the same performance on-lightwith high reliability.

Calibration of AGILE-GRID with on-ground data and Monte Carlo simulations