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Update on the GMOS-S status: MOS

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Although the CCD1 CTE issue was fixed, the noise problem on CCD2 and CCD1 persists.

Users are advised to choose an appropriate dither strategy minimizing the effects of the bad amplifier on their science data and/or to place targets or spectral features of interest on other parts of the detector. Se this document for further description. For MOS and IFU-R, tha same startegy can be applied as well.  The main additional difficulty is the wavelength calibration since some arc lines are wiped out and the autoidentify task may fail. In this case, the lines identification has to be done interactively.

For IFU-2, it is more complicated since amp5 is a relatively larger portion of the spectral interval and calibration would in general fail or be quite poor. Nevertheless,  we are looking into it.

For dithers we recommend +/-30 arcseconds in P (across the detector columns) in the case of imaging, and for spectroscopy a spectral dither size of at least +/-15m for B1200, +/-25 nm for R831, +/-30nm for B600, and +/-45nm for R400.

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