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The Space Variable Object Monitor (SVOM) is a forthcoming Chinese - Frenchastrophysics space mission dedicated to the study of Gamma-ray bursts andhigh-energy transients. ECLAIRs, a wide-field hard X-ray coded mask imager, isthe leading instrument for the transient detection and their firstlocalisation. The sensitivity of such instruments is usually limited by thebackground, either of instrumental or astrophysical origin. Detailedestimations of the background are obtained by simulating the interaction ofparticles with the matter using, in the present case, the GEANT4 Monte-Carlotoolkit. However, this is a time consuming process, especially when it isneeded to carry out all possible geometrical and orbital configurations.Instead, we present a much faster method that allows computing the backgroundin either a static or dynamic (time dependent) way. The method is based on thepreliminary calculation of a large particle database using the GEANT4 toolkitfollowed by a selection process based on the incoming direction and energy ofthe particles. This approach is as accurate as direct Monte-Carlo methods,while it reduces the computation time by a factor of $10^3 - 10^4$ for ourapplication. We apply this method to compute the SVOM/ECLAIRs dynamicbackground.

Simulations of the SVOM/ECLAIRs Dynamic Background: A fast, accurate and general approach for wide-field hard X-ray instruments