SCIENCE and CALIB product files are renamed

Names of 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 parameter values all recognizable from the product name.

With the begin of period 77 (April 2006), both science and calibration product files are renamed.

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

Instrument code

All MIDI pipeline product names start with AM.

Type of product

The type of product is coded in the fits key HIERARCH.ESO.PRO.CATG. A short form of this is coded in the name using a four character scheme:

1st letter M or P calibration product, master file or product file   S science product 2nd to 4th letter ... type of product

Science products have the following scheme:

MI_S<PPP>_<OBS_ID>_<DATE_TIME>_<parameter_string>.<ext>

e.g.

MI_SHS_224715_2006-04-15T05:34:56.000_HIGH_SENS_U1_U4_AB_HD135344.fits

where:

• S<PPP> is the four letter code uniquely describing the type of SCIENCE product (the first letter is always S for SCIENCE)
• OBS_ID is the OB number read from the OBS.ID fits key
• DATE_TIME is the UT date and time of the first raw frame measured for the OB (e.g. 2005-04-01T04:31:12); this information is required since OBs can be executed several times
• parameter_string is a string containing the instrument setup information (e.g. dispersive mode, telescope stations)
• ext is either fits or tfits (for fits tables)

The following types of science products presently exist:

 

CODE TYPE OF FILE PRO_CATG SA or SACQ image acquisition IMAGE_QUALITY SHSS reduced fringe file statistics (HIGH SENS mode) REDUCED_DISPERSED_STAT SHS or SHSF reduced fringe file (HIGH SENS mode) REDUCED_DISPERSED SSP or SSPF reduced fringe file (SCI PHOT mode) REDUCED_DISPERSED_SCIPHOT

For the instrument parameter string see below.

An example of a calibration product is given by:

MI_MHS_060405A_STARINTF_HIGH_SENS_A0_G0_hd124897_SLIT_0.2_GRISM_bas_51.856.fits

The following types of calibration products presently exist:

CODE TYPE OF FILE PRO_CATG VERSIONING? MA or MACQ image acquisition IMAGE_QUALITY_CALIB yes MWF or MHWF display of the fringe file WATERFALL yes MLIN Detector linearity DETLIN yes MRON Detector Read-Out-Noise DETRON yes MREF Reference pixels REFPIX yes MWAV/MWAVE Wavelength calibration WAVE yes MTRN Transmission of the dispersive elements DSPTRN yes MK11 MK12 MK21 MK22 Kappa Matrix (for SCI_PHOT calibration) KAPPA_MATRIX_CALIB yes MKA or MKAP master Kappa Matrix (for SCI_PHOT calibration) KAPPA_MATRIX_CALIB yes MHSS calibrator reduced fringe file statistics(HIGH SENS mode) REDUCED_DISPERSED_STAT_CALIB yes MHS or MHSF calibrator reduced fringe file (HIGH SENS mode) REDUCED_DISPERSED_CALIB yes MSP or MSPF calibrator reduced fringe file (SCI PHOT mode) REDUCED_DISPERSED yes

Date of origin, version

The date of origin is identical to the date of the raw data measurement. It is coded as, e.g., 051015 for Oct 15, 2005.

The version of a file is indicated by capital letters always starting with A. Versioning is supported for certain types of files, see above table. In all other cases, only one version per day is created (always A).

Instrumental parameters

The mode is included in the product name.

Suffix

Most product files have an image format and suffix .fits. Some product files are tables and have suffix .tfits. In either case they are FITS files, of course.