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Assessment of Cosmic Ray Rejection for Image Differencing

  • Eric C. Bellm

Abstract

We evaluate the contamination rate of DIASources by unmasked cosmic rays (CRs), with implications for the snaps observing mode.

We estimate that after filtering on CR pixel flags and apply a reliability score threshold, fewer than 3% of real ComCam transients would be due to unmasked CRs. We outline several straightforward steps to further improve rejection performance on LSSTCam. Data taken in snaps mode does not appear to be a panacea due to non-CR changes in alignment, PSF, saturation, etc. between the two snaps.

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