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IRAC: Software: repeat_delta_dark.pro |
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repeat_delta_dark.pro : IDL procedure to fix the "first-frame" effect for
IRAC observations using repeats. Especially for channel 3 BCDs, the first
frame correction is not very good for the second and subsequent repeats at
a given pointing. If repeats were used in the creating the AOR, the
channel 3 images will have a slight residual bias which has a distinct
pattern across the image. This procedure constructs a "delta-dark" from the difference images of the repeat with the corresponding first BCD in each pointing. The derived delta-dark is then applied to each repeated frame. The algorithm is described in detail in the header comments in the procedure source code. The software requires IDL version 5.3 or greater and the astrolib IDL library. The software has been tested on Solaris 9 and Mac OS 10.3.9 with IDL versions 5.6 and 6.1.
This software is not considered part of the pipeline and no installation support from the SSC should be expected. We are however very interested in your feedback in order to improve or replace the algorithm and are glad to work with you in test cases and analysis. Please send your comments to help@spitzer.caltech.edu. The IDL procedure repeat_delta_dark.pro.
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help@spitzer.caltech.edu http://ssc.spitzer.caltech.edu/irac/deltadark/
