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- W1998232532 abstract "At the beginning of the previous decade, it was recognized that a possible means of improving existing hard X-ray and γ-ray telescopes, where focusing techniques are totally impracticable, is the incorporation of the coded-aperture technique to actually image celestial sources. The primary advantage of such a technique is to maintain the angular resolution of a single pinhole camera, while increasing the overall effective area of the instrument. Moreover, the coded-mask principle includes the simultaneous measurement of the sky and detector background, systematic effects due to temporal variations in the background are removed. This paper reports on the French SIGMA telescope, the first coded-aperture telescope sensitive to radiation in the energy range from 35 KeV to 1.3 MeV to be operated in space. The SIGMA telescope is one of the main devices on board the astronomy satellite GRANAT, success-fully launched on December 1, 1989 from Baikonour, Kazakhstan. After a comprehensive description of the instrument, a report is given on the most relevant inferences which can be drawn from two years of successful in-orbit operations, in order to better define the next generation of γ-ray instruments." @default.
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- W1998232532 date "1993-07-01" @default.
- W1998232532 modified "2023-10-16" @default.
- W1998232532 title "Two years of successful operations of the coded-mask telescope SIGMA for hard X-ray and soft γ-ray astronomy" @default.
- W1998232532 cites W2043898532 @default.
- W1998232532 doi "https://doi.org/10.1016/0094-5765(93)90119-h" @default.
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