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StrayCats is an X-ray survey using the stray light within the NuSTAR X-ray telescope. The telescope is intended for pointed, planned observations, but bright sources from 1° to 4° away from the target source of such a planned observation produce an illuminated pattern on the focal plane that is also recorded. The pattern is not merely another object in the telescope's field of view; it is X-rays from beyond the edge of the field of view accidently guided and reflected back onto the sensors, the pattern formed depending the their source's position relative to the field of view. These patterns yield usable data about these unintended sources.