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The GLAST burst monitor instrument response simulation system

The Gamma-ray Large Area Space Telescope (GLAST) will study the cosmos in the 10 keV 300 GeV energy range. The Large Area Telescope (LAT) is the main instrument, and will cover the 20 MeV 300 GeV energy range. A second instrument, the GLAST Burst Monitor (GBM), is designed to provide wide field of view observations of gamma-ray bursts from 10 keV to 25 MeV, overlapping with the lower limit of the LAT range. The GBM is composed of twelve NaI and two BGO detectors that are widely dispersed about the GLAST spacecraft. Reconstructing burst locations and energy spectra from these separated detectors requires detailed knowledge of the response to direct and scattered burst radiation. A simulation software package based on the GEANT4 Monte Carlo toolset is being developed to fulfill this requirement. Our main task is to understand the GBM detector response for direct source photons, photons scattering from the instrument and spacecraft body, and photons scattering from the earth's atmosphere. We will discuss the architecture of our simulation system, present preliminary comparisons between simulation results and laboratory measurements, and use these results to evaluate the scientific capabilities of the GBM.