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 2.31 in order to derive calibrated images; DCEs (not including those with bias boosts) were coadded using mips_enhancer with the dark flag turned on. The read noise was calculated by running the IDL script get_rdnoise_new, 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 dark current and read noise were measured from the read noise block of 35 DCEs (with only one bias boost), with values of 9.9 +/- 1.7 e/s and 45.4 +/- 5.5 e, respectively. These numbers are in the range that has been measured on the ground (see the read noise log).
Figure 1: 24 micron dark calibration image, a coaddition of 45 10-second
exposures. The data range from ~ 1 to 3 DN/s.
The dark calibration and read noise on CE2 are unchanged from CE1.