A hard X-ray sky survey with the SIGMA telescope of the GRANAT observatory
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- Revnivtsev, M.G., Sunyaev, R.A., Gilfanov, M.R. et al. Astron. Lett. (2004) 30: 527. doi:10.1134/1.1784494
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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.