| 1 | | Todo |
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| | 2 | The current GPC1 camera is characterized by a several rectangular hot-spots of large dark current. These regions are unusable for science. This recent dark frame traces the location of these structures |
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| | 4 | [[Image(dark.1.jpeg)]] |
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| | 6 | In the images I have examined, typical dither patterns insufficiently remove this pattern; the inter-pointing offsets are on the order of a couple of arcminutes, while hotspots cluster on scales of several tens of arcminutes. |
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| | 8 | The image below shows the dither pattern used to image the Fornax cluster in 2008. In this six-pointing dither, regions with no contribution from bad pixels are coded white. Regions with 1-6 bad pointings are colored blue, green, yellow, orange, red, and black. |
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| | 11 | ---- |
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| | 14 | The above dark image can be used as a map of bad regions on GPC1; this information can be used in turn to engineer dither patterns which minimize the number of bad-pixel overlaps. One such dither pattern is shown here: |
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| | 16 | [[Image(anneal.png)]] |
