15 October 1997 Gamma-ray burst monitor on board BeppoSAX: the Monte Carlo simulation for the response matrix
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The gamma ray burst monitor onboard the BeppoSAX satellite is a secondary function of the anticoincidence shields of the phoswich detection system hard x-ray experiment. For this reason the four CsI slabs operating as gamma ray bursts detectors have a not uniformly clear field of view. Actually the other SAX experiments partially obstruct the GRBM FOV in a way that strongly depends both on direction and energy. This peculiarity makes very hard to build-up a real response matrix of the experiment by simply interpolating the on-ground calibration. Therefore a complex activity of Monte Carlo simulation has been started using the MCNP code, in which the entire SAX satellite is described in a 3D geometrical reconstruction. This code is being used for the simulation of the on-ground calibration set-up, and once a good level of confidence is reached on that, it will be used to reconstruct direction, intensity and spectrum of the cosmic gamma ray bursts. In this paper we present the Monte Carlo set-up, discussing the approach to the work and the approximations that need to be done. Then the first results of the simulations are shown and compared, for some monochromatic energies and for several incoming directions, to the results obtained during the on-ground calibrations.
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Massimo Rapisarda, Lorenzo Amati, Maria Nerina Cinti, Marco Feroci, Enrico Costa, P. Collina, Guido Zavattini, Filippo Frontera, Luciano Nicastro, M. Orlandini, Eliana Palazzi, and Daniele Dal Fiume "Gamma-ray burst monitor on board BeppoSAX: the Monte Carlo simulation for the response matrix", Proc. SPIE 3114, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII, (15 October 1997); doi: 10.1117/12.283769; https://doi.org/10.1117/12.283769


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