IRCS FITS header information

FITS header keywords (Feb 2026 ~)

Here are examples of the IRCS FITS header.

• Imaging mode
• Grism mode
• Echelle mode (SPG array)
• Echelle mode (CAM array as slitviewer)
• Imaging polarimetry
• Spectropolarimetry

See below for the IRCS keyword dictionary.

• IRCS keywords

Old information (until Jan 2026)

For data taken until January 2026, see here.

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updated Feb. 2026