GO Added Near-IR Fringe Flats (Rev. A)

Details GO Added Near-IR Fringe Flats (Rev. A) GO Added Near-IR Fringe Flats (Rev. A)

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stis.rept...15b&link_type=abstract

Instrument Science Report STIS 97-15, 5 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

The STIS CCD exhibits fringing in the near-IR which limits the signal-to-noise obtainable at wavelengths longward of 7000 A in the G750L and G750M spectral modes. The fringing can be largely rectified by the application of a flat field (a so called "fringe flat") taken contemporaneously with the science data, without allowing motion of the Mode Select Mechanism. This fringe flat can be taken either during on-orbit time or it can be buried in the occultation. Analysis of SMOV and Cycle 7 Calibration data shows that the fringes can be reduced from ~10% rms amplitude to ~<1% rms by the application of the appropriate flat. Subsequent ISRs will describe the techniques and results of utilizing on-orbit contemporaneous flats to reduce spectroscopic data taken at wavelengths longward of 7000 A. Here we describe for the GO how to insert these flats in their Phase 2. Contemporaneous fringe flats are strongly recommended for all observations taken in G750L or G750M at wavelengths longward of 7000 A during Cycle 7. In this revision we provide an updated recommendation for obtaining fringe flats along with 52x0.2F1 slit spectra of point sources (see Table 2).

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