Viganò, D. 2010 通过伽马暴的观测来校准ITEGRAL的一个仪器

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Title:		Calibration of the INTEGRAL SPI Anti Coincidence Shield with Gamma Ray Bursts observations
Authors:		Viganò, D.; Mereghetti, S.
Publication:		eprint arXiv:0912.5329
Publication Date:		12/2009
Origin:		ARXIV
Keywords:		Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Comment:		6 pages, 3 figures, poster paper, to appear in the proceedings of The Extreme sky: Sampling the Universe above 10 keV, held in Otranto (Lecce, Italy) on 2009 October 13-17
Bibliographic Code:		2009arXiv0912.5329V

Abstract

The Anti Coincidence Shield (ACS) of the INTEGRAL SPI instrument provides an excellent sensitivity for the detection of Gamma Ray Bursts (GRBs) above ~ 75keV, but no directional and energy information is available. We studied the ACS response by using GRBs with known localizations and good spectral information derived by other satellites. We derived a count rate to flux conversion factor for different energy ranges and studied its dependence on the GRB direction and spectral hardness. For a typical GRB spectrum, we found that 1 ACS count corresponds on average to ~ 1E-10 erg/cm^2 in the 75keV-1MeV range, for directions orthogonal to the satellite pointing axis. This is broadly consistent with the ACS effective area derived from the Monte Carlo simulations, but there is some indication that the latter slightly overestimates the ACS sensitivity, especially for directions close to the instrument axis.

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