Improvements to Calnica

Details Improvements to Calnica Improvements to Calnica

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008nicm.rept....2d&link_type=abstract

Instrument Science Report NICMOS 2008-002, 17 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos, Calnica

Scientific paper

This ISR describes a number of improvements to calnica, the STSDAS task thatperforms routine instrumental calibration of NICMOS raw images. We report two major and a number of minor updates to the code. The major updates consist of changes in theway the count rate is calculated from up-the-ramp fitting and changes in the cosmic rays rejection algorithm. All updates have been extensively tested and analysis shows improvement in the S/N of output images by 6-15% compared to the previous calnica version. A further improvement is that the error extension in the calibrated images now represents the true errors in a more consistent way compared to the old implementation of the software.

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