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product names
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Data product names

The names of all calibration pipeline products follow a certain naming convention. This is done to have human-readable rather than technical file names. The naming scheme has been chosen to have the type of product, its date of creation, and its pipeline-relevant setup values recognizable in the product name.

The general format of user-oriented product file names is the same for all VLT/VLTI instruments.

On the archive interface, the master calibrations can be associated to science files and downloaded. Then they carry technical filenames (the archive filename ARCFILE). In order to rename them to the original filenames, search for the fits header key ORIGFILE. The naming scheme of ORIGFILE is described here.

Instrument code

All product names start with two letters which are specific for the instrument. For instance: UVES product names start with 'UV', VISIR names with 'VR'.

Product category

The full value of the product category is coded in the FITS header key HIERARCH.ESO.PRO.CATG. A short form of this tag is encoded in four characters being unique per instrument:

1st letter M or P calibration product
G general (static) calibration product
2nd to 4th letter ... type of product

Calibration products come in two flavours: dynamic ones (being updated regularly, short validity), and static ones (never or rarely updated). The static ones are also called 'general' because they often are not derived from raw data (like e.g. a line catalogue).

Both product types are stored in the archive and are available for download through the calSelector service. All GIRAFFE pipeline product names start with "GI_".

Dynamic calibrations. The following types of dynamic calibration products of GIRAFFE exist:

Code type of file PRO_CATG
MBIA master bias MASTER_BIAS
MDRK master dark MASTER_DARK
PLOW localization width FF_LOCWIDTH
PLOC localization centroid FF_LOCCENTROID
PFEX extracted spectra FF_EXTSPECTRA
PFEE extraction errors FF_EXTERRORS
PNLW localization width (nasmyth flats) NF_LOCWIDTH
PNLC localization centroid (nasmyth flats) NF_LOCCENTROID
PNEX extracted spectra (nasmyth flats) NF_EXTSPECTRA
PNEE extraction errors (nasmyth flats) NF_EXTERRORS
PDIS dispersion solution DISPERSION_SOLUTION
PRBS rebinned spectra ARC_RBNSPECTRA
PSRS* rebinned spectra (STD) STD_RBNSPECTRA
PIMG* reconstructed image (STD) STD_RCSPECTRA
PRSP* instrument response (STD) INSTRUMENT_RESPONSE

* for Argus only

Static calibrations. These are the codes for the static calibrations:

Code type of file PRO_CATG
GCAT line catalog LINE_CATALOG
GRAT grating data GRATING_DATA
GMSK line mask LINE_MASK
GDIS reference dispersion solution REFERENCE_DISP_SOLUTION
GSGS slit geometry setup SLIT_GEOMETRY_SETUP
GFLX flux standard list FLUX_STANDARDS

The remaining part of the names follow the same convention as for the dynamic products (see below).

Date of origin, version

The date of origin is identical to the date of the raw data measurement. It is coded like, e.g., 191015 for Oct 15, 2019.

The version of a file is indicated by capital letters, starting with A. Versioning is supported when reasonable, otherwise it is always A.

Instrument parameters

The instrument parameters characterizing a setup are included in the product name. Most GIRAFFE products have the following scheme:

(since 2010-10-20): <SLIT>_<GRATING><WLEN>_o<ORDER>_<READ>


  • SLIT is either Medusa1, Medusa2, IFU1, IFU2, or Argus,
  • GRATING is either H (high resolution) or L (low resolution)
  • WLEN is the central wavelength in nm of the mode,
  • ORDER is the spectral order (to distinguish 'old' and 'new' setups),
  • READ is either n (Normal) or f (Fast) or s (Slow) and indicates the read speed.
Master biases have only =1x1 and = n/f/s as setup string.

STD data have in addition the target name coded, <SLIT>_<GRATING><WLEN>nm_o<ORDER>_<TARG_NAME>.

Static calibration products either have some setup part, or contain some self-explanatory string like e.g. GI_GATM_021213A_atm_extinction.fits for the extinction table.


All product files have extension .fits. They have either image format or binary table format. Most GIRAFFE pipeline products have in addition to the image part an extension with the 'fibre-setup table'. That table lists the fibre parameters (from the ozpoz and fibre tables attached to the raw files) for the fibres actually found. More ...


GI_PDIS_140516A_Argus_L773.4nm_o2.fits: dispersion solution for Argus, setup L773.4 (order 2); taken on date 2014-05-16 (first one on that date).

GI_PFEX_180606B_Medusa2_L427.2nm_o4.fits: extracted flat for Medusa2, setup L427.2 (order 4); taken on date 2018-06-06 (second one).

GI_PFEX_201106B_Medusa2_L427.2nm_o4_n.fits: same product type, taken on date 2020-11-06.

GI_MBIA_140101A_1x1_f.fits: master bias for 2014-01-01, fast mode.

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