THE ING NEWSLETTER No. 4, March 2001
    GENERAL
    THE ING WIDE FIELD IMAGING SURVEY SCIENCE
    TELESCOPES AND INSTRUMENTATION
    OTHER NEWS FROM ING
    TELESCOPE TIME

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    Bug in AF2/WYFFOS Reduction Software

    John Telting and Robert Greimel (ING)

    WYFRED is the IRAF package that can be used to reduce data obtained with AF2/WYFFOS. It was written especially for AF2/WYFFOS data reduction, and was distributed under the IRAF RGO package that is in use at the ING. The software makes use of a correspondence table that matches fibre numbers to aperture numbers on the detector. This correspondence table can be found in the file rgo/wyffos/lib/crossLARGE in the external IRAF tree.

    In the summer of 2000 one of the fibres (#90) in the Large Fibre Module was disabled because it suffered some mechanical problems. This led us to discover that the aperture numbers corresponding to fibres #89 and #90 were swapped in the WYFRED correspondence table. This means that data reduced with WYFRED may suffer from confusion of the objects observed with these fibres. The correct correspondence table is listed in version 1.03 of the AF2/WYFFOS manual available from http://www.ing.iac.es/Astronomy/observing/manuals/man_wht.html. Older versions of the manual contain the wrong table.

    As of October 2000 we have updated our IRAF WYFRED distribution at ING. We maintain a downloadable distribution of WYFRED at http://www.ing.iac.es/~astrosw/InstSoft/rgo/.
     


    Email contacts:
    John Telting (jht@ing.iac.es), AF2 Instrument Specialist
    Robert Greimel (greimel@ing.iac.es), Astronomy Software Support

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