This data release provides access to reduced scientific data obtained with the cryogenic high-resolution spectrograph CRIRES+, an upgrade of the original instrument CRIRES, which was available till July 2014. CRIRES+ is in operation at the ESO VLT since October 2021. This instrument is a cross-dispersed infrared echelle specrograph with increased wavelength range covered simultaneously by a factor of ten in respect to the old CRIRES. In addition, CRIRES+ is equipped with a new detector focal plane array composed of three Hawaii 2RG detectors with a 5.3 μm cut-off wavelength, a new spectroparimetric unit was added, and the calibration system was enhanced.

The release does not include data from the old, pre-upgrade CRIRES. Polarimetry, spectroastrometry and 2D observations obtained with CRIRES+ are not included either, as well as any L- and M-band observations.

Data have been reduced using the CRIRES+ pipeline version CR2RE-1.6.9 or higher. All data have their instrument signature removed: they have been de-biased, flat-fielded, wavelength-calibrated, sky-subtracted and coadded. Error estimates and quality flags are provided. The reduced science spectra and the associated set of ancillary information that comes with them are described in detail in the accompanying release description. The 1D spectra are stored in a tabular format following the established standard for ESO science data products. Instructions on how to read or display the spectra can be found in the 1D spectrum data format help page.

Initially, the CRIRESplus data collection consists of the spectra taken during the last year (e.g. since Jun 2024) and it will grow with time to include all the data taken from beginning of operations. The new CRIRES+ data that are acquired regularly at the observatory will also become available, within about a month after the observations. The data access will respect the proprietary periods. The data products can be queried and downloaded using the ESO Archive Science Portal or the programmatic access. The DOI assigned to this data collection is 10.18727/archive/96.