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ROSAT
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=== {{anchor|XRT}} X-ray Telescope (XRT) === The main assembly was a German-built imaging X-ray Telescope (XRT) with three focal plane instruments: two German Position Sensitive Proportional Counters (PSPC) and the US-supplied High Resolution Imager (HRI). The X-ray mirror assembly was a grazing incidence four-fold nested [[Wolter telescope|Wolter I telescope]] with an {{Convert|84|cm|in|0|abbr=on|adj=on}} diameter aperture and {{Convert|240|cm|in|0|abbr=on|adj=on}} focal length. The angular resolution was less than 5 arcsec at half energy width. The XRT assembly was sensitive to X-rays between 0.1 and 2 keV.<ref name="NASA, ROSAT" />
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