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

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

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stis.rept....3s&link_type=abstract

Instrument Science Report STIS 2000-03, 28 pages

Other

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

Scientific paper

An analysis of all low and medium resolution observations of the STIS Sensitivity Monitoring Programs made prior to December 1999 shows continuation of trends correlated with temperature and with time. We provide the first detailed report on additional trends in sensitivities revealed by the medium resolution modes of the instrument. Only the G750L mode shows no significant variation in sensitivity. All other modes, when averaged over a broad band of the wavelength coverage of each, show evidence for an ~1%/yr decline, except for G140L and G230L (after ~1998.7) being ~1.4%/yr, G140M being ~2.5%/yr, and G430L declining at ~0.5%/yr. A bimodal, before and after ~1998.7, trend previously found in the G230L is found in the NUV-MAMA G230M. Similar trends are also evident in the CCD in the G230LB and the two G230MB monitoring modes. The temperature dependence of the sensitivity in the G140M modes is found to be consistent with the -0.25%/°C correlation measured in the G140L mode. The mean "relative gain", gain1/gain4, of the CCD between 1998.3 and 1999.7 was 4.039 ±0.006 and did not change significantly in that period. Recommendations are made for changes in the "pipeline" calibration software to correct for the time and temperature variations in all L modes and in the M modes of both MAMA detectors.

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