Removing the Pattern Noise from all STIS Side-2 CCD data

Details Removing the Pattern Noise from all STIS Side-2 CCD data Removing the Pattern Noise from all STIS Side-2 CCD data

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..50j&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Physics

Scientific paper

When HST/STIS resumed operations in July 2001 using its redundant "Side-2" electronics, the read-noise of the CCD detector appeared to have increased by 1 ˜e^- due to a superimposed and highly variable "herring-bone" pattern noise. For the majority of programs aiming to detect signals near the STIS design limits, the impact of this noise is far more serious than implied by a mere 1 e^- increase in amplitude of the read-noise, as it is of a systematic nature and can result in ˜8 e^- relative deviations (peak-to-valley). We discuss the nature of the pattern noise, and summarize a method to robustly detect and remove it from raw STIS CCD frames. We report on a Cycle 16/17 Archival Calibration Legacy program to (semi-)automatically remove the herring-bone pattern noise from all raw, unbinned Side-2 STIS/CCD frames taken between 2001 July and 2004 August -- representing a gain in effective sensitivity of a factor 3 at low S/N. We also present some trends in the characteristics of the noise pattern.

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