FORS1 Pipeline: Recipe for DARK reduction

FORS1 Pipeline
Recipe for DARK reduction

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recipe name: FORS_DARK
input frames: DARK
associated templates: FORS1_img_cal_dark

purpose: Creates a master dark from a set of dark frames.

description: After bias subtraction, the median of the corrected input frames is calculated. The combined frame is finally normalised to the unit time. The overscan regions, if present, are removed from the result. The master frame has 2 extensions, with the actual product being in the first extension and its errors being in the second extension.

Dark master calibration frames are generally not used in further data reduction steps: dark current in the FORS detectors is negligible, and trying to subtract it would just add noise to the data. Dark frames are just produced for monitoring the instrument.

products:

Master PS GIF Header

F1_MDRK_080401A_C1_100Khi_2x2

F1_MDRK_080401A_C2_100Khi_2x2

F1_MDRK_080401A_C1_200Klo_2x2

F1_MDRK_080401A_C2_200Klo_2x2