Sensitivity Monitor Report for the STIS First-Order Modes

Details Sensitivity Monitor Report for the STIS First-Order Modes Sensitivity Monitor Report for the STIS First-Order Modes

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...27w&link_type=abstract

STIS Instrument Science Report 98-27, 35 pages

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

Scientific paper

The sensitivity of the STIS first-order CCD and MAMA modes has been monitored by observations of standard stars for over a year, from shortly after their initial turnon near mid-1997 until the present. The bulk of the data are from the L modes, although some observations in the M modes provide useful complementary information. Examples of the data in each mode are illustrated, providing an overview of the STIS first-order capabilities. Any changes in the average CCD sensitivities are less than 1%/yr. The formal slope of the fit to the monitoring data and 1 s uncertainties are G230LB: +0.56 %/yr ± 0.29, G430L: -0.07 %/yr ± 0.27, G750L: +0.19 %/yr ±0.43. A small but significant dependence of the G140L sensitivity on temperature, of -0.37%/deg C ± 0.06, has been found. After the observations are corrected for that effect, the G140L sensitivity changes are also less than 1%/yr (0.77 ± 0.33). The G230L sensitivity is observed to INCREASE at a rate of +1.6%/yr (8 s) over the entire wavelength range, and by 2.2%/yr (6 s) in the 2200-2400 Å range. Hence, no significant losses of sensitivity due to contamination or any other cause have been observed during this period. After correcting G140L and G230L for temperature and time correlations, respectively, the 1 s photometric repeatabilities in broad bands range from 0.3% for G230L to 0.7% for G750L.

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