Has the ROSAT clock lost time?
Yes. The clock lost about 1.5 seconds in the first 200 days of the mission. A linear fit to the O-C relation for 1990 leaves a parabolic- shaped residual plot. A quadratic fit applied to the data after they are divided into three subsamples leaves residuals of less than two msec. For 1991, information is only available to June. Here, a linear fit leaves residuals of about 2.5 msec. Further details are available in files to be found in the ftp rosat/doc/ subdirectory.
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