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FORS2 Pipeline:
Recipe for Dark Reduction

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  • recipe name: FORS_DARK
  • input frames: DARK
  • associated templates: FORS2_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
F2_MDRK_080408A_C1hi_2x2
F2_MDRK_080408A_C2hi_2x2
F2_MDRK_080408A_C1lo_2x2
F2_MDRK_080408A_C2hi_2x2

 


 
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