GNIRS Integral Field Spectroscopy

The Low-Resolution (natural seeing) integral field unit (LR-IFU) for GNIRS arrived and was installed into the instrument in early June. The first terrestrial spectrum, of an arc lamp, while the instrument was still off the telescope, was taken on 13 June 2022 and all looked well. GNIRS was reinstalled on the telescope in early July and is now completely checked out for science use in all imaging and slit spectroscopy modes. In just a few short days on the telescope, GNIRS has been put back to good use, already having taken simultaneous imaging with JWST and the first on-sky LR-IFU engineering observations. Commissioning of the LR-IFU will begin in queue mode shortly. Meanwhile, the high-resolution IFU for use with adaptive optics is still under development in Durham, UK. We expect delivery in the final quarter of 2022.