Abstract
The SIGMA X-ray telescope accumulated the images of more than a quarter of the sky during the in-orbit operation of the GRANAT observatory. The longest exposure time (∼9 million s) was spent on the observations of the Galactic center region. We give an overview of the SIGMA X-ray observations and report the sensitivities achieved in various regions of the sky.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 30, No. 8, 2004, pp. 582–588.
Original Russian Text Copyright © 2004 by Revnivtsev, Sunyaev, Gilfanov, Churazov, Goldwurm, Paul, Mandrou, Roques.
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Revnivtsev, M.G., Sunyaev, R.A., Gilfanov, M.R. et al. A hard X-ray sky survey with the SIGMA telescope of the GRANAT observatory. Astron. Lett. 30, 527–533 (2004). https://doi.org/10.1134/1.1784494
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DOI: https://doi.org/10.1134/1.1784494