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ALFOSC flat field images

............. This page is currently under construction ..........

2004 dome flat
summer 2009 twilight flat

Click on the images to see details.
Check the ALFOSC flatfield archive for dome flats in fits format.

i#12 dome flat 11-2009 Combined ALFOSC i(#12)-band twilight flat with cuts set to +-14% of the median level. This is a median of 9 dome flats from 21-11-2009, with the median count level about 36k ADUs. Individual frames have been de-biased.
R#76 dome flat 11-2009 Combined ALFOSC R(#76)-band twilight flat with cuts set to +-10% of the median level. This is a median of 5 dome flats from 21-11-2009, with the median count level about 44k ADUs. Individual frames have been de-biased.
V#75 dome flat 12-2009 Combined ALFOSC V(#75)-band twilight flat with cuts set to +-7% of the median level. This is a median of 9 dome flats from 09-12-2009 with the median count level about 19k ADUs. Individual frames have been de-biased.
B#74 dome flat 12-2009 Combined ALFOSC B(#74)-band twilight flat with cuts set to +-6% of the median level. This is a median of 7 dome flats from 09-12-2009, with the median count level about 19k ADUs. Individual frames have been de-biased.


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