Quality Control and
Data Processing

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
GATM	extinction table	ATMOSPHERIC_EXTINCTION

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:

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

where

• 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.