synopsis: residual systematic uncertainty: for C100: at most 5% for C_105 otherwise better than 3%; for C200: at most 6% for C_200 otherwise better than 3%.
limitations and applicability:
only applies to the photometric calibration of filters different from the
filter for which the FCS is obtained.
description:
Homogenizes the responsivity of a detector pixel from filter to filter.
purpose correction:
The responsivity of the detector should per definition be identical for
measurements with different filters of the same detector at the same
time. This is not the case without this correction. This correction
improves the photometric calibration for filterbands different from the
one for which the FCS measurement is obtained.
uncertainty/noise introduced:
After correction, the C100 and C200 filter-to-filter calibration is better
than 5% for C_105 otherwise better than 3% for C100 filters; for the
C200 filters at most 6% for C_200 otherwise better than 3%. No uncertainty
arises when the FCS measurement is obtained in the same filterband as the
sky measurement.
auxillary data:
Cal-G file PC1FLAT, PC2FLAT
uncertainties are supplied in the Cal G file.