Pipeline News: Build 12.1 of the Science Calibration Pipeline Is Now Available
November
21, 2025
Build 12.1 includes improvements to all four JWST instruments.
News
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New MIRI Wide Field Slitless Spectroscopy Mode Is Available for Cycle 5
August 22, 2025This new mode enables efficient spectroscopic observations of multiple sources in a single pointing.
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Pipeline News: Build 12.0 of the Science Calibration Pipeline Is Now Available
August 6, 2025Build 12.0 includes improvements for MIRI, NIRCam, and NIRISS as well as time-series observations.
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Updates to the MIRI Long-Wavelength Reduced Count Rate
August 1, 2025New models of the count rate better predict the decrease in future observing cycles. These models will be incorporated into upcoming Build 12.1 of the pipeline (expected November 2025) and Cycle 6 of the JWST ETC.
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Pipeline News: Improved MRS Cosmic Ray Shower Correction in Build 11.3
July 8, 2025Build 11.3 includes an improved algorithm to correct for MIRI MRS cosmic ray showers in faint sources.
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New MIRI LRS Calibrations Are Now Available
October 4, 2024New and improved calibrations are now available for both the MIRI Low-Resolution Spectrometer (LRS) fixed-slit and slitless modes.
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A New and Improved MIRI MRS Photometric Calibration Is Now Available
September 26, 2024The photometric calibration reference files for the Medium Resolution Spectrometer have been updated to reflect a more comprehensive analysis using data obtained over the course of JWST Cycles 1 and 2.
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MIRI Coronagraphy: PSF Reference Star Backgrounds Are Now Publicly Accessible
June 17, 2024A zero exclusive access period now applies to data from MIRI observations of coronagraphic PSF reference star-associated background targets.
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An Improved Correction to the MIRI Imager Long-Wavelength Count Rate Loss Is Now Available
March 19, 2024The improved correction is available in the latest version of the JWST Calibration Pipeline and replaces the correction provided in September 2023.
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Updates to MIRI Low Resolution Spectrometer Reference Files
January 24, 2024New reference files for the MIRI Low-Resolution Spectrometer (LRS) improve the wavelength and photometric calibration, as well as the aperture correction.
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Temporal Behavior of the MIRI Reduced Count Rate
September 29, 2023Investigations over the last 18 months help characterize the decline in the MIRI count rate.
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Updates to the MIRI Imager Flux Calibration Reference Files
September 19, 2023As a result of continued analysis of calibration observations and improvements in code and algorithms, significant updates to the Imaging and Coronagraphic Imaging flux calibration reference files are now available.
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MIRI Imager Reduced Count Rate
August 24, 2023Calibration data reveals a reduced count rate in the long-wavelength filters of the MIRI Imager.
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MIRI MRS Data Processing Improvements Are Now Available
July 14, 2023Multiple updates to the MIRI Medium Resolution Spectrometer (MRS) pipeline and the associated reference files are now available.
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MIRI MRS Reduced Count Rate Update
May 25, 2023This update reports on a careful study of the impact the measured MIRI MRS decrease count rate has on science data, as well as on the upcoming pipeline mitigation.
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The NASA James Webb Space Telescope, developed in partnership with ESA and CSA, is operated by AURA’s Space Telescope Science Institute.