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NIRI performance monitoring

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  • Throughput in imaging mode: Observations consist of imaging of photometric standards using YJHKLM filters. Data for each filter are taken once a month. Photometric conditions are required, but observations can be collected during twilight.


  • Throughput in spectroscopic mode: Observations consist of spectroscopy of spectrophotometric standards, taken in slitless mode, for JHKLM f/6, and JHL f/32 grisms. Data are collected once every three months. Observations require photometric weather, but tolerate twilight conditions.


  • Image Quality: Observations consist of images taken in good seeing conditions, at a range of elevations, with all filters. There is no need to schedule specific observations, since the photometric standard fields can be used for this task.


  • Detector linearity: Observations consist of spectroscopic flat-fields with varying exposure times. The measured counts will be compared with expectations assuming linear response. Only one instrument configuration is required. Data are collected once a year.


  • P2 focus offset: Observations consist of a standard focus sequences using a nearby star cluster as target. Observations do not require photometric conditions, can be taken in twilight, and are executed once every three months.


  • Detector cosmetics: Characterization and monitoring of detector artifacts, such as hot pixels and transient events. As in the case of GMOS (above), observations consist of dark exposures. Such data are collected on a routine basis for NIRI.


  • WCS in all three cameras, with/out ALTAIR: will allow for for a monitoring of the pointing accuracy. No need for new data to be taken, as the standard star fields allow for these measurements to be taken.


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