Scientific simulations and optimization of the XGIS instrument on board THESEUS

Mereghetti, S.; Ghirlanda, G.; Salvaterra, R.; Campana, R.; Labanti, C.; Connell, P.; Farinelli, R.; Frontera, F.; Fuschino, F.; Gasent-Blesa, J. L.; Guidorzi, C.; Lissoni, Michele; Rigoselli, Michela; Stephen, J. B.; Amati, L.

doi:10.1117/12.2560989

Cited by 4 publications

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“…We use the calibrated synthetic population (of long and short GRBs) together with the knowledge of the THESEUS instrumental properties to estimate the impact of the mission on GRB population studies (see [72] for further details). The power of THESEUS in detecting and localizing GRBs, and eventually providing a redshift measurement, is shown in Fig.…”

Section: Grbs Detectable By Theseusmentioning

confidence: 99%

Gamma ray burst studies with THESEUS

et al. 2021

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Gamma-ray Bursts (GRBs) are the most powerful transients in the Universe, over–shining for a few seconds all other γ-ray sky sources. Their emission is produced within narrowly collimated relativistic jets launched after the core–collapse of massive stars or the merger of compact binaries. THESEUS will open a new window for the use of GRBs as cosmological tools by securing a statistically significant sample of high-z GRBs, as well as by providing a large number of GRBs at low–intermediate redshifts extending the current samples to low luminosities. The wide energy band and unprecedented sensitivity of the Soft X-ray Imager (SXI) and X-Gamma rays Imaging Spectrometer (XGIS) instruments provide us a new route to unveil the nature of the prompt emission. For the first time, a full characterisation of the prompt emission spectrum from 0.3 keV to 10 MeV with unprecedented large count statistics will be possible revealing the signatures of synchrotron emission. SXI spectra, extending down to 0.3 keV, will constrain the local metal absorption and, for the brightest events, the progenitors’ ejecta composition. Investigation of the nature of the internal energy dissipation mechanisms will be obtained through the systematic study with XGIS of the sub-second variability unexplored so far over such a wide energy range. THESEUS will follow the spectral evolution of the prompt emission down to the soft X–ray band during the early steep decay and through the plateau phase with the unique ability of extending above 10 keV the spectral study of these early afterglow emission phases.

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Section: Grbs Detectable By Theseusmentioning

confidence: 99%

Gamma ray burst studies with THESEUS

et al. 2021

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“…the redistribution function and effective area), which is a fundamental input for scientific simulations. 15 The response can be derived by performing a Monte Carlo simulation at several monochromatic energies and at different angles with respect to the detector axis. Figure 9 shows the effective area for the X-mode as a function of the off-axis angles.…”

Section: Responsementioning

confidence: 99%

The XGIS instrument on-board THESEUS: Monte Carlo simulations for response, background, and sensitivity

Campana¹,

Fuschino²,

Labanti³

et al. 2021

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The response of the X and Gamma Imaging Spectrometer (XGIS) instrument onboard the Transient High Energy Sky and Early Universe Surveyor (THESEUS) mission, selected by ESA for an assessment phase in the framework of the Cosmic Vision M5 launch opportunity, has been extensively modelled with a Monte Carlo Geant-4 based software. In this paper, the expected sources of background in the Low Earth Orbit foreseen for THESEUS are described (e.g. diffuse photon backgrounds, cosmic-ray populations, Earth albedo emission) and the simulated on-board background environment and its effects on the instrumental performance is shown.

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“…By combining the angular responses of the two units, offset by ±20°, a total 2-150 keV FOV of 117×77 deg 2 FWHM is obtained (Figure 5). Details of the XGIS mask and collimator design can be found in [7,8]. Above 150 keV the collimator becomes nearly transparent and the FOV is determined by the passive elements of the satellite.…”

Section: Figure 4 Variation Of the Effective Area Of One Xgis Camera ...mentioning

confidence: 99%

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

Labanti

Amati

Frontera

et al. 2020

Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray

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Scientific simulations and optimization of the XGIS instrument on board THESEUS

Cited by 4 publications

References 0 publications

Gamma ray burst studies with THESEUS

Gamma ray burst studies with THESEUS

The XGIS instrument on-board THESEUS: Monte Carlo simulations for response, background, and sensitivity

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

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