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Monitoring observations are observations of a source in more or less regular time intervals. The absolute timing of the observations is not important; however, once an observing sequence has started, it is essential that it be continued. The guest observer can specify the time interval between two observations in the observing sequence; scheduling the observations at the specified rate with deviations of less than fifteen percent will be attempted. The number of observations to be scheduled is specified in the source form and the total requested time (in the target form) will be distributed approximately equally between the individual observations.
Guest investigators planning to propose monitoring observations should
carefully consider the visibility of the proposed targets (see
Chapter 7 
). Further note that the alternation of XRT focal
plane detectors between PSPC and HRI
may prevent further monitoring if the monitoring period becomes too large.