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The code and additional files that make up this page and the data reduction are available at github.com/ivh/CRIRES-LM.

CRIRES-LM

Bulk reduction of all public CRIRES+ L-band (2.8--4.2 um) and M-band (4.4--5.5 um) science data from the ESO archive (September 2021 through March 2025), with improved slit tilt calibration and per-observation telluric correction using vipere (a fork of viper).

The paper describes the calibration approach, data products, and known limitations. This repository contains the scripts that produce the archive and the corrected *_tw.fits tracing tables (slit tilt + improved wavelength solutions) that can be used as drop-in inputs for custom cr2res reductions.

Citation

If you use these data or scripts, please cite:

@article{marquart2026crireslm,
  author        = {Marquart, Thomas and Lavail, Alexis},
  title         = {An archive of reduced and telluric-corrected CRIRES$^+$
                   L- and M-band spectra with slit-tilt and wavelength calibrations},
  journal       = {arXiv e-prints},
  year          = {2026},
  eprint        = {2604.24466},
  archivePrefix = {arXiv},
  primaryClass  = {astro-ph.IM},
  url           = {https://arxiv.org/abs/2604.24466}
}

@misc{crires_lm_data,
  author       = {Marquart, Thomas and Lavail, Alexis},
  title        = {{CRIRES+ L/M-band reprocessed spectra}},
  howpublished = {Zenodo},
  year         = {2026},
  doi          = {10.5281/zenodo.19675664},
  url          = {https://doi.org/10.5281/zenodo.19675664}
}

Repository structure

*.py                   scripts (fetch, reduce, telluric correct, wavecal, compare, webapp)
*_tw.fits              tracing/wavelength tables per setting (calibration products, aggregate-corrected)
cr2res_obs_nodding.rc  esorex recipe config for nodding
cr2res_cal_flat.rc     esorex recipe config for flats
flats/                 flat field data: {setting}_{date}/ subdirs with SOFs and output
tellurics/             telluric standard reductions, tilt + wavecal scripts
templates/             HTML templates for the inspection webapp
paper/                 LaTeX source of the paper

Raw data, reduced products, and FITS outputs are not included (too large); they live on disk and can be regenerated from the scripts + ESO archive.

Requirements