STIS CCD Performance Monitor: Read Noise, Gain, and Consistency of Bias correction during June 1997 - June 1998

Details STIS CCD Performance Monitor: Read Noise, Gain, and Consistency of Bias correction during June 1997 - June 1998 STIS CCD Performance Monitor: Read Noise, Gain, and Consistency of Bias correction during June 1997 - June 1998

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stis.rept...31g&link_type=abstract

STIS Instrument Science Report 98-31, 13 pages

Computer Science

Performance

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

Scientific paper

We summarize the baseline performance of the STIS CCD during the period June 1997 - June 1998. Read-out noise and gain as a function of time are reported. These basic CCD parameters turn out to be generally consistent with those measured during Ground Calibration, and do not show any significant trend with time. The exception is the read-out noise in the high gain settings (CCDGAIN1=2, 4, and 8), which are higher in orbit than they were on the ground. This is due to electronic pick-up "pattern" noise which raises the effective read-out noise. Fortunately, data in the standard gain setting (CCDGAIN=1) are not affected by electronic pick-up noise. The current values for in-flight unbinned data taken in CCDGAIN=1 are: Read-out noise = 4.02 ± 0.08 electrons, and gain = 1.00 ± 0.02 electrons per ADU. The current values for the CCDGAIN=4 setting are: Read-out noise = 7.65 ± 0.16 electrons, and gain = 4.08 ± 0.05 electrons per ADU. The twodimensional structure of bias frames is sufficiently stable to allow combinations of many of them, taken over a long period of time, to create high-signal-to-noise superbias images.

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