The JWST Near Infrared Spectrograph (NIRSpec) has four observing modes for near-infrared multi-object spectroscopy (MOS), integral field unit (IFU) spectroscopy, fixed slit (FS) spectroscopy, and bright object time-series (BOTS) spectroscopy, from 0.6–5.3 μm. 


Overview of NIRSpec observing modes

NIRSpec has four observing modes that correspond to templates in the Astronomer's Proposal Tool (APT):









Last updated

Published December 30, 2016


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Updated April 05, 2017

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Published March 02, 2017