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Calibration Access and Data Handbook

Procedure

The intensity distribution map will be stored in CCF CalSourceData (sections 4.3.7 and 4.3.8), in its first extension. A second extension will hold the energy spectrum.

The intensities of the calibration sources will be corrected for the half life of the source, via. a function of the form I=I$_{0}$exp-($\tau$t). Where, $\tau$ (log$_{e}$/T$_{1/2}$) is an attribute in the CCF file, and time t is the elased time between observationStartTime and reference time which is also an attribute in the CCF file.

The function returns a energy spectrum in the range from E_LOW to E_HIGH for a given CCD, and 0-12 pattern selection, for a duration of exposure .