Abstract
The Chinese-French space mission SVOM (Space-based multi-band Variable Object Monitor) due to be launched in 2021 is dedicated to the study of the transient sky, in particular Gamma-Ray Bursts. SVOM will play a key role in the time-domain and multi-messenger astronomy by providing regular alerts to the ground and space facilities, as well as ensuring a broadband follow-up of the sources from X-rays to near infrared. ECLAIRs is the prime instrument onboard the SVOM mission detecting automatically new transient within its field of view and providing their first localization. This telescope is a wide-field coded-mask imager working in the 4-150 keV band. It will sample the temporal and spectral properties of the detected GRBs. The detection plane of this instrument is made of 6400 Schottky CdTe detectors coupled to a low-noise front end electronics. Building a reliable spectral response model of the detection plane is important to retrieve the appropriate spectral parameters of astrophysical sources observed by ECLAIRs. In this paper, we present our MonteCarlo spectral response model of the ECLAIRs detection plane taking into account the main radiation-matter interactions, the physical properties of the detectors. Then, we show how we calibrated this model using lab measurements, leading to the computation of the first realistic spectral response matrix. This work also enabled us to investigate in details the physical properties of a large sample of Schottky CdTe detectors. We discuss in this paper the performances of these detectors.
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