The SXI telescope on board EXIST: scientific performances
L. Natalucci, A. Bazzano, S. Campana, P. Caraveo, R. Della Ceca, J.E., Grindlay, F. Panessa, G. Pareschi, B. Ramsey, G. Tagliaferri, P. Ubertini, G., Villa

TL;DR
The SXI telescope on board EXIST is designed to perform broadband X-ray observations, surveys, and transient monitoring, significantly enhancing the study of high-energy astrophysical sources like AGNs and GRBs with unprecedented sensitivity.
Contribution
This paper presents the scientific performance and design status of the SXI telescope, highlighting its capabilities for broadband studies and sky surveys in the EXIST mission.
Findings
SXI provides broadband coverage from 0.1 to 10 keV.
It enables detailed spectral and variability studies of AGNs and GRBs.
It will conduct a sky survey with a limiting flux of 5x10^{-14} cgs.
Abstract
The SXI telescope is one of the three instruments on board EXIST, a multiwavelength observatory in charge of performing a global survey of the sky in hard X-rays searching for Supermassive Black Holes. One of the primary objectives of EXIST is also to study with unprecedented sensitivity the most unknown high energy sources in the Universe, like high redshift GRBs, which will be pointed promptly by the Spacecraft by autonomous trigger based on hard X-ray localization on board. The recent addition of a soft X-ray telescope to the EXIST payload complement, with an effective area of ~950 cm2 in the energy band 0.2-3 keV and extended response up to 10 keV will allow to make broadband studies from 0.1 to 600 keV. In particular, investigations of the spectra components and states of AGNs and monitoring of variability of sources, study of the prompt and afterglow emission of GRBs since the…
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