• ROSAT, AXAF/Chandra, and X-ray Multi-Mirror Mission have all devoted considerable effort and money to carry out extensive preflight ground calibration and end-to-end testing. As Japanese missions become more complex and powerful, it will be expected by the international community that they attain a similar level of calibration accuracy. This might require the development of more extensive ground calibration facilities.

Acknowledgments

I would like to acknowledge useful discussions with Pete Serlemitsos, George Ricker, Steve Kahn, and Pat Henry on various aspects of the ASCA mission.



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