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Published May 1991 | Published
Book Section - Chapter Open

Reduction of PG:1115+080 Images


The data are three exposures in PC6 through F785LP obtained on March 3, 1991. The exposure times are 120, 400, and 400 seconds. The data are reduced with the "standard" WFPC reduction scheme: A-to-D correction, DC bias subtraction, AC bias subtraction, dark current subtraction, preflash subtraction, and flat field normalization, using the best available calibration data. The exposures are combined into a weighted average normalized to 400 seconds exposure time, so one DN (data number) is about 17.25 electrons. At this step, cosmic rays are removed by intercomparison of the three images.

Additional Information

© 1991 Space Telescope Science Institute. Provided by the NASA Astrophysics Data System.

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Published - 1991fyho_conf__192G.pdf


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