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The Phase A study of the THESEUS/XGIS instrument is supported by ASI-INAF Agreement n. 2018-29-HH.0, OHB Italia/ - INAF-OASBo Agreement n.2331/2020/01, by the European Space Agency ESA through the M5/NPMC Programme and by the AHEAD2020 project funded by UE through H2020-INFRAIA-2018-2020. By the Spanish Ministerio de Ciencia e Innovacion, PID2019-109269RB-C41. By Polish National Science Center, Project 2019/35/B/ST9/03944 and Foundation for Polish Science, Project POIR.04.04.00-00-5C65/17-00.

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The X/Gamma-ray Imaging Spectrometer (XGIS) on-board THESEUS: Design, main characteristics, and concept of operation

Publicated to:Proceedings Of Spie - The International Society For Optical Engineering. 11444 114442K- - 2021-01-01 11444(), DOI: 10.1117/12.2561012

Authors: Labanti, C; Amati, L; Frontera, F; Mereghetti, S; Gasent-Blesa, J L; Tenzer, C; Orleanski, P; Kuvvetli, I; Campana, R; Fuschino, F; Terenzi, L; Virgilli, E; Morgante, G; Orlandini, M; Butler, R C; Stephen, J B; Auricchio, N; De Rosa, A; Da Ronco, V; Evangelisti, F; Melchiorri, M; Squerzanti, S; Fiorini, M; Bertuccio, G; Mele, F; Gandola, M; Malcovati, P; Grassi, M; Bellutti, P; Borghi, G; Ficorella, F; Picciotto, A; Zanini, V; Zorzi, N; Demenev, E; Rashevskaya, I; Rachevski, A; Zampa, G; Vacchi, A; Zampa, N; Baldazzi, G; La Rosa, G; Sottile, G; Volpe, A; Winkler, M; Reglero, V; Connell, P; Pinazo-Herrero, B; Navarro-Gonzalez, J; Rodriguez-Martinez, P; Castro-Tirado, A J; Santangelo, A; Hedderman, P; Lorenzi, P; Sarra, P; Tcherniak, S M Pedersen A D; Guidorzi, C; Rosati, P; Trois, A; Piazzolla, R

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Abstract

THESEUS (Transient High Energy Sky and Early Universe Surveyor) is one of the three missions selected by ESA as fifth medium class mission (M5) candidates in its Cosmic Vision science program, currently under assessment in a phase A study with a planned launch date in 2032. THESEUS is designed to carry on-board two wide and deep sky monitoring instruments for X/gamma-ray transients detection: a wide-field soft X-ray monitor with imaging capability (Soft X-ray Imager, SXI, 0.3 - 5 keV), a hard X-ray, partially-imaging spectroscopic instrument (X and Gamma Imaging Spectrometer, XGIS, 2 keV - 10 MeV), and an optical/near-IR telescope with both imaging and spectroscopic capability (InfraRed Telescope, IRT, 0.7 - 1.8 mu m). The spacecraft will be capable of performing fast repointing of the IRT to the error region provided by the monitors, thus allowing it to detect and localize the transient sources down to a few arcsec accuracy, for immediate identification and redshift determination. The prime goal of the XGIS will be to detect transient sources, with monitoring timescales down to milliseconds, both independently of, or following up, SXI detections, and identify the sources performing localisation at

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