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 these data, with a value 37.5 +/- 8.3 e. The numbers are slightly lower (by roughly 15%) than most of the measurements in previous campaigns.
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.