GNIRS LS reduction: nswavelength error

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    Anonymous

    Hello, I’m attempting to reduce some GNIRS long slit spectra (10/mmLR_G5532 grating, central wavelength ~3.5 microns).

    I’ve installed Geminiconda and progressed through a few initial reduction steps (nsheader, nsprepare, nsreduce, nsflats) without too much difficulty.

    However, I’m stuck at nswavelength. I’m providing a calibration star spectrum as the input for wavelength calibration. nswavelength does not request an output spectrum, and then the following occurs:

    –> nswavelength
    Input GNIRS/NIRI lamp spectra: /Users/User/Desktop/data/Gemini/GNIRS/nN20160810S0263.fits
    ——————————————————————————-
    NSWAVELENGTH — Wed Jun 20 12:48:50 PDT 2018

    NSWAVELENGTH: LS data detected. Calling nswhelper to process data.
    ——————————————————————————-
    NSWHELPER — Wed Jun 20 12:48:50 PDT 2018

    Using input files:
    /Users/User/Desktop/data/Gemini/GNIRS/nN20160810S0263
    Using output files:
    w/Users/User/Desktop/data/Gemini/GNIRS/nN20160810S0263
    ——————————————————————————
    NSAPPWAVE — Wed Jun 20 12:48:50 PDT 2018

    NSAPPWAVE: Processing 1 extension(s) from 1 file(s).
    Camera Grating Filter Prism FPMask Wave Delta Order Axis
    Killing IRAF task `fxcopy’
    Traceback (innermost last):
    File “<CL script CL1>”, line 1, in <module>
    File “<CL script gnirs.nswavelength>”, line 298, in nswavelength

    [… skipping the iraf.nswhelper text to shorten this post… ]

    File “<CL script gnirs.nsappwave>”, line 289, in nsappwave
    iraf.fxcopy(Vars.inimg + ‘.fits’, Vars.outimg + ‘.fits’,group = ‘0’,new_file=yes,verbose=no)
    IrafError: Error running IRAF task fxcopy
    IRAF task terminated abnormally
    ERROR (741, “Cannot open file (w/Users/User/Desktop/data/Gemini/GNIRS/nN20160810S0263.fits)”)

    It appears that nswavelength is looking for an output file in the “w” directory, but this directory doesn’t exist. I tried to manually generate a “w” directory just to see if I could work around this error, but it still crashes with the same issue.

    I’m using Gemini IRAF package 1.14, installed on a Mac: Yosemite 10.10.5. I installed the package using the instructions provided on the Gemini data reduction pages.

    Any guidance would be greatly appreciated!

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