The present chips in the instrument have numerous and large cosmetic defects. We placed the transient's location on a clean region of the detector in all exposures, and so did not pay much attention to mitigating the effects of bad pixels on other regions of the image during data processing. Kitt Peak acknowledgement may also be in order in some cases, e.g. if you wish to reproduce the image. More detail coming soon. The instrument used was the Kitt Peak CCD Mosaic camera.
North is to the left, and East is at the bottom.