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On the in-flight calibration plans of modern x-ray observatories

Petre, Robert; Guainazzi, Matteo; Audard, Marc +5 more

We present an overview of the set of celestial sources used for in-flight calibration of x-ray detectors by past and operational missions. We show the rationale behind their choice as a guideline for future missions aiming at optimizing the critical early phases of their science operations.