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The Near-Infrared Spectrograph (NIRSpec) is one the four focal planeinstruments on the James Webb Space Telescope (JWST) which was launched onDecember 25, 2021. We present the in-flight status and performance of NIRSpec'sdetector system as derived from the instrument commissioning data. Theinstrument features two 2048 x 2048 HAWAII-2RG sensor chip assemblies (SCAs)that are operated at a temperature of about 42.8 K and are read out via a pairof SIDECAR ASICs. NIRSpec supports "Improved Reference Sampling andSubtraction" (IRS2) readout mode that was designed to meet NIRSpec's stringentnoise requirements and to reduce 1/f and correlated noise. In addition, NIRSpecfeatures subarrays optimized for bright object time series observations, e.g.for the observation of exoplanet transit around bright host stars. We focus onthe dark signal as well as the read and total noise performance of thedetectors.

The In-Flight Noise Performance of the JWST/NIRSpec Detector System