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calib data
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MUSE: Calibration data
Raw CALIB data types | CALIB products | Calibration cascade | Static calibration files

Raw CALIB data types

Calibration data are taken for two purposes:

  • to calibrate SCIENCE data
  • to measure and control the instrumental status

MUSE calibration data are mostly taken as daytime calibrations. Twilight flat-field exposures, standard stars and astrometry fields are taken as part of the calibration plan during the night. Find information about the MUSE data format, spectral format and the detector here. The following calibration data are taken as part of the MUSE calibration plan. The data types are identified by the DPR.TYPE and DPR.TECH keyword in the FITS headers. For details on the data, and in particular, on each extension see the MUSE reference frames web page.

BIAS CALIB BIAS IFU detector status, bias level 11
DARK CALIB DARK IFU dark current 5
FLAT CALIB FLAT,LAMP IFU tracing of slices; flat flux level 11
ARC LAMPs CALIB WAVE IFU wavelength calibration 15, the input frames come as multiple of 3 for Ne, Xe, and HgCd arc lamps each
SKY FLAT CALIB FLAT,SKY IFU illumination correction >=3
Spectrophotometric STD CALIB STD IFU absolute flux calibration, telluric correction 1
ASTROMETRY CALIB ASTROMETRY IFU astrometric correction 1
GEOMETRY CALIB WAVE,MASK IFU geometry correction 80

*N: typical number taken per night and setting

The ARC LAMP exposures are taken separately for each spectral lamp: Ne, Xe and HgCd. Thus, the number of input frames is always multiple of 3. The different lamp exposures can be distinguished by the shutter status keyword having True (T) rather than False (F) value:

  • Ne: INS.SHUT3.ST=T
  • Xe: INS.STUT4.ST=T
  • HgCd: INS.SHUT5.ST=T

The GEOMETRY and ASTROMETRY observations are taken about monthly to monitor status of the instrument. They have to be processed together and the pipeline requires special hardware and software setup. Thus, the products exist as "static calibrations" and are renewed whenever it is necessary.

CALIB products
Raw CALIB data types | CALIB products | Calibration cascade | Static calibration files

Raw frame(s) recipe description product(s)
BIAS muse_bias creates a master bias from a set of input raw frames MASTER_BIAS
DARK muse_dark creates a master dark from a set of input raw frames MASTER_DARK
LAMP_FLAT muse_flat creates a master lamp flat and trace table from a set of input frames MASTER_FLAT, TRACE_TABLE
ARC muse_wavecal obtains the wavelength calibration solution from an input arc-lamp frames WAVECAL_TABLE
STD muse_standard determines instrumental response STD_RESPONSE, STD_TELLURIC, DATACUBE_STD
SKY_FLAT muse_twilight creates a master twilight flat from a set of input frames TWILIGHT_CUBE

STD_RESPONSE - change between pipeline v.1 and v.2

The shape of STD_RESPONSE changed with transition from pipeline v.1 to v.2 (2017-05-01 in QC system). The v.2 response contains the correction for the flat field, while the v.1 one does not. The flat field correction is indicated by the ESO_DRS_FFCORR keyword, which allows the pipeline to distiguish between different formats and handle them accordingly. Thus, the pipeline is backwards compatible.

Naming scheme

After production and certification, the calibration products are archived. They are named with a scheme including type, creation date and relevant setting parameters. For the detailed description of the product names go here. The master calibrations are available for archive users through the calSelector service.

Calibration cascade
Raw CALIB data types | CALIB products | Calibration cascade | Static calibration files

The processing of MUSE calibration frames requires a cascaded scheme where the mutual dependencies of products and raw frames are respected. The proper sequence of all these production steps is called the calibration cascade. It is described here.

Within that cascade, all products are checked with respect to their quality and their relationship in time. This means e.g. that a dispersion solution is not only generated using an arbitrary quality-checked localization solution, but that specific solution is chosen which is closest in time.

All products created by QC Garching follow the calibration cascade. On the other hand, Paranal-processed science data use standard solutions created by QC Garching and possibly several months old.

Static calibration files
Raw CALIB data types | CALIB products | Calibration cascade | Static calibration files

Static calibration tables (the ones not being regularly processed from raw calibration data) come as FITS tables and are available through the calSelector archive service. Some of them come with different versions indicated by unique date, e.g.140101, of creation, as they are being updated with time.

Table name PRO.CATG Purpose
MU_GASR_dateA_astrom_cat.fits ASTROMETRY_REFERENCE catalog of astrometric standards
MU_GASW_dateA_astrom_wcs_wfm.fits ASTROMETRY_WCS catalog of the WCS positions of the astrometric standards
MU_GBPT_dateA_badpix_table.fits BADPIX_TABLE table of bad pixels
MU_GEOT_dateA_geometry_table_wfm.fits GEOMETRY_TABLE geometry table
MU_GEXT_dateA_extinct_table.fits EXTINCT_TABLE extinction table
MU_GFIL_140101A_filter_list.fits FILTER_LIST list of filters
MU_GLNC_140101A_line_cat.fits LINE_CATALOG line catalog
MU_GSDR_dateA_std_response_wfm-e.fits STD_RESPONSE response curve for the WFM-E mode
MU_GSDR_dateA_std_response_wfm-n.fits STD_RESPONSE response curve for the WFM-N mode
MU_GSDR_dateA_std_response_nfm-ao-n.fits STD_RESPONSE response curve for the NFM mode
MU_GSFT_140101A_stdflux_table.fits STD_FLUX_TABLE flux table for the standard stars
MU_GSKL_140101A_sky_lines.fits SKY_LINES catalog of the sky lines
MU_GVIM_140906A_vignetting_mask.fits VIGNETTING_MASK vignetting mask, OBSOLETE, NOT used for the data since 2018-01-01
MU_GLSP_dateA_lsf_profile_slow_wfm-e.fits LSF_PROFILE LSF profile for the WFM-E mode
MU_GLSP_dateA_lsf_profile_slow_wfm-n.fits LSF_PROFILE LSF profile for the WFM-N mode
MU_GLST_140501A_lsf_table.fits LSF_TABLE LSF table, OBSOLETE, NOT used with current pipeline version
MU_GLSC_141014A_lsf_cube_slow_wfm-e.fits LSF_CUBE LSF cube for WFM-E mode, OBSOLETE, NOT used with current pipeline version
MU_GLSC_141014A_lsf_cube_slow_wfm-n.fits LSF_CUBE LSF cube for WFM-N mode, OBSOLETE, NOT used with current pipeline version

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