Ms. Laura Gosset Profile

Laura Gosset

at CEA-Ctr de Saclay

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Proceedings Article | 11 July 2016 Paper

Localization algorithms for micro-channel x-ray telescope on board SVOM space mission

L. Gosset, D. Götz, J. Osborne, R. Willingale

Proceedings Volume 9905, 99051L (2016) https://doi.org/10.1117/12.2232355

KEYWORDS: X-ray telescopes, Space operations, Gamma radiation, X-rays, Space telescopes, Gamma radiation, Stars, Sensors, Galactic astronomy, Telescopes, X-ray detectors

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SVOM is a French-Chinese space mission to be launched in 2021, whose goal is the study of Gamma-Ray Bursts, the most powerful stellar explosions in the Universe. The Micro-channel X-ray Telescope (MXT) is an X-ray focusing telescope, on board SVOM, with a field of view of 1 degree (working in the 0.2-10 keV energy band), dedicated to the rapid follow-up of the Gamma-Ray Bursts counterparts and to their precise localization (smaller than 2 arc minutes). In order to reduce the optics mass and to have an angular resolution of few arc minutes, a Lobster-Eye" configuration has been chosen. Using a numerical model of the MXT Point Spread Function (PSF) we simulated MXT observations of point sources in order to develop and test different localization algorithms to be implemented on board MXT. We included preliminary estimations of the instrumental and sky background. The algorithms on board have to be a combination of speed and precision (the brightest sources are expected to be localized at a precision better than 10 arc seconds in the MXT reference frame). We present the comparison between different methods such as barycentre, PSF fitting in one or two dimensions. The temporal performance of the algorithms is being tested using the X-ray afterglow data base of the XRT telescope on board the NASA Swift satellite.

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