Figure 1: 24 micron dark calibration image, a coaddition of 45 10-second exposures. The data range from ~ 1 to 3 DN/s.
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All data were processed with DAT version 2.4 in order to derive calibrated images; the set of 50 dark DCEs (not including those with bias boosts) were coadded using mips_enhancer with the dark flag turned on. The read noise was calculated from the set of 35 read noise DCEs with the IDL script get_rdnoise, which has been modified to reject cosmic rays from 24 micron SUR data.
Figure 1 shows the coadded dark calibration image. The illumination pattern and mean counts are nearly identical to darks obtained on the ground. The read noise was measured from the additional set of 35 DCEs with only one bias boost, yielding a value of 38.0 +/- 8.6 e.
Figure 1: 24 micron dark calibration image, a coaddition of 45 10-second
exposures. The data range from ~ 1 to 3 DN/s.
The routine dark calibration and read noise are nominal.