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The X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite is anX-ray CCD camera system that has superior performance such as a low background,high quantum efficiency, and good energy resolution in the 0.2-12 keV band.Because of the radiation damage in orbit, however, the charge transferinefficiency (CTI) has increased, and hence the energy scale and resolution ofthe XIS has been degraded since the launch of July 2005. The CCD has a chargeinjection structure, and the CTI of each column and the pulse-height dependenceof the CTI are precisely measured by a checker flag charge injection (CFCI)technique. Our precise CTI correction improved the energy resolution from 230eV to 190 eV at 5.9 keV in December 2006. This paper reports the CTImeasurements with the CFCI experiments in orbit. Using the CFCI results, wehave implemented the time-dependent energy scale and resolution to the Suzakucalibration database.

Energy-Scale Calibration of the Suzaku X-Ray Imaging Spectrometer Using the Checker Flag Charge Injection Technique in Orbit