Figure 1. Coadded 24 µm dark image (not including bias boost DCEs). Data values range from ~ 0 to 15 DN/s. Bad pixels have been masked out.
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All data were processed with DAT version 2.21 in order to derive calibrated images. The 24 micron and 70 micron dark A and B images were coadded using mips_enhancer with the dark flag.
The 24 µm dark remains dark. Figure 1 shows the calibrated, coadded image of all 50 DCEs in the observation (combined with mips_enhancer). Mean counts are 4.5 DN/s (this is probably artificially inflated due to larger slopes in the bottom part of the array; see the MIPS-190 report).
Figure 1. Coadded 24 µm dark image (not including bias boost
DCEs). Data values range from ~ 0 to 15 DN/s.
Bad pixels have been masked out.
Figure 2 shows the slope images for both dark positions coadded from all non-stim DCEs in the observation. The side B anomaly is still present. Mean slopes are ~ 100 DN/s at the dark A position, and ~ 140 DN/s at dark B. These signals are roughly a factor of 2 smaller than in the previous campaign (F), most likely because there was no thermal anneal in that campaign. They are comparable to the darkest levels seen on the ground.
Figure 2. 70 µm slope images at the 70 µm dark A
position (left), dark B position (middle) and the 160 µm dark/SED mode
position (right). Values range from 0 to ~ 400 DN/s.
The 160 µm array is fairly dark, with mean counts ~ 1600 DN/s (not including readout 3). This is somewhat on the high end of what was seen during ground testing. A slope image is shown in Figure 3. As at 70 µm, the signal level here is smaller than in campaign F, and more representative of the typical dark level, because of the thermal anneal. Readout 3 continues to misbehave, being completely off-scale below the bottom rail.
