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CRIRES:
calibration data

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CRIRES CALIBRATION DATA: GENERAL

Calibration data for CRIRES are taken for two purposes:

  • assess the instrumental status
  • calibrate SCIENCE data.

CRIRES calibration data are in general taken during daytime. On request by the user, also night-time calibrations can be obtained as part of the Observing Block which generates the SCIENCE data ("attached calibrations"). Telluric and spectro-photometric standard stars are observed upon request.

TYPES OF RAW CALIBRATION DATA

The CRIRES data format is described here.

The following calibration data are taken as part of the daily CRIRES calibration plan and/or upon request by the user. Data types are identified by the DPR TYPE keyword in the FITS headers.

frame DPR.CATG DPR.TYPE DPR.TECH purpose N* FITS headers examples
DARK CALIB DARK IMAGE detector status, dark current
3
dark.hdr [ DARK example frame ]
FLAT
CALIB FLAT
SPECTRUM blaze function, fixed-pattern noise
1
flat.hdr [ FLAT example frame ]
DETLIN
(replaced by DETMON)
CALIB DARK
FLAT
LINEARITY,LAMP
LINEARITY,LAMP
detector non-linearity
17
17
  see dark
and flat
examples
DETMON
(series of darks and flats with increasing DIT)
CALIB DARK,DETCHECK
FLAT,LAMP,DETCHECK
LINEARITY,LAMP
LINEARITY,LAMP
detector non-linearity and gain variable   see dark
and flat
examples
ARC LAMP CALIB WAVE,LAMP SPECTRUM wavelength calibration
1
wave_arc.hdr [ ARC LAMP example frame ]
GAS CELL CALIB WAVE,ABSORPTION-CELL SPECTRUM wavelength calibration 1 wave_n2o.hdr [ N2O example frame ]
STD CALIB STD SPECTRUM,DIRECT,OTHER
SPECTRUM,DIRECT,JITTER
SPECTRUM,NODDING,OTHER
SPECTRUM,NODDING,JITTER
telluric features, instrumental efficiency n/a std.hdr [ STD example frame ]

* N: typical number taken per night and setting

CALIBRATION PRODUCTS

Complete overview of calibration files and recipes

Raw frame(s) recipe description
product(s) [PRO.CATG header keywords]
DARK crires_spec_dark create a master dark from a set of input raw frames
CALPRO_DARK
FLAT crires_spec_flat create normalised flat and bad pixel map
CALPRO_FLAT,
CALPRO_BPM
DETLIN crires_spec_detlin determine detector non-linearity (replaced by detmon_ir_lg)
DETLIN_A, DETLIN_B, DETLIN_C, DETLIN_Q
DETMON detmon_ir_lg determine detector non-linearity and gain LINGAIN_LIN, LINGAIN_GAIN, LINGAIN_COEFFS
ARC LAMP,
GAS CELL
crires_spec_wave determine wavelength solution
CALPRO_WAVE, WL_MAP_IMA, WL_MAP_MODEL_IMA
STANDARD STAR crires_spec_jitter extract spectrum, determine instrumental efficiency
EXTRACT_SENS_TAB

Naming scheme

After production and certification, the calibration products are renamed with a more user-friendly scheme which includes type, creation date and relevant setting parameters.

Description of naming scheme

CALIBRATION CASCADE

The processing of CRIRES 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.

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 solution, but that specific solution is chosen which is closest in time.

All products created by DFO Garching follow the calibration cascade. On contrary, Paranal-processed science data never use the up-to-date calibration products but pre-manufactured standard solutions that are possibly several months old.

STATIC CALIBRATION TABLES

The following static calibration tables (the ones not being regularly processed from raw calibration data) are required for CRIRES data processing:

  • line tables for ThAr emission lines, N2O absorption lines, and sky lines
  • standard star fluxes
  • configuration of the physical model.

They come as FITS tables and are part of the Service Mode delivery.

The static tables can be downloaded as gzipped tar file here [19 MB, created in February 2012].

In addition, there are maps of the coefficients for non-linearity correction which are updated when necessary.
FILE NAME PIPELINE FILE NAME* PRO.CATG DESCRIPTION
CR_GCAT_080901A_lines_thar.fits lines_thar.fits CALPRO_THAR_CATALOG catalog of ThAr lines (using NIST measurements published in September 2008)
CR_GCAT_061130A_lines_n2o.fits lines_n2o.fits CALPRO_N2O_CATALOG catalog of N2O lines
CR_GCAT_061130A_lines_hitran.fits lines_hitran.fits CALPRO_HITRAN_CATALOG catalog of sky lines
(for > 1800nm)
CR_GCAT_061130A_lines_oh.fits lines_oh.fits CALPRO_OH_CATALOG catalog of OH sky lines
(for < 1800nm)
CR_GFLX_061130A_stdstars.fits stdstars.fits CALPRO_STD_PHOTOFLUX table of photometric standard star fluxes
CR_GMOD_<DATE>A_model_conf.fits model_conf.fits CALPRO_MODEL_CONFIG configuration for physical model
CR_PDLA_080131A_ALL.fits
CR_PDLB_080131A_ALL.fits
CR_PDLC_080131A_ALL.fits
Download here
NONE DETLIN_A
DETLIN_B
DETLIN_C
non-linearity coefficients files, valid before February 2009
CR_PDLA_090305A_ALL.fits
CR_PDLB_090305A_ALL.fits
CR_PDLC_090305A_ALL.fits
Download here
NONE

DETLIN_A
DETLIN_B
DETLIN_C

non-linearity coefficients files, valid for February 2009 and later (this version should be used only for comparison)
CR_PDLA_090417A_ALL.fits
CR_PDLB_090417A_ALL.fits
CR_PDLC_090417A_ALL.fits
Download here
NONE DETLIN_A
DETLIN_B
DETLIN_C
non-linearity coefficients files, valid for February 2009 and later
CR_PDLA_090603A_ALL.fits
CR_PDLB_090603A_ALL.fits
CR_PDLC_090603A_ALL.fits
Download here
NONE DETLIN_A
DETLIN_B
DETLIN_C
non-linearity coefficients files, detectors are fully illuminated, valid for June 2009 and later
CR_PDLA_091018A_ALL.fits
CR_PDLB_091018A_ALL.fits
CR_PDLC_091018A_ALL.fits
Download here
NONE DETLIN_A
DETLIN_B
DETLIN_C
non-linearity coefficients files, valid for October 2009 and later
CR_PDLA_100727A_ALL.fits
CR_PDLB_100727A_ALL.fits
CR_PDLC_100727A_ALL.fits
Download here
NONE DETLIN_A
DETLIN_B
DETLIN_C
non-linearity coefficients files, valid after 18 July 2010
CR_PDCO_110409A_ALL.fits NONE COEFFS_CUBE non-linearity coefficients cube for pipeline V2.1.x, valid April 2011 and later
CR_PDCO_120123A_ALL.fits NONE COEFFS_CUBE non-linearity coefficients cube valid January 2012 and later
*PIPELINE FILE NAME: file name in pipeline distribution

PROBLEMS AND ISSUES

CRIRES pipeline problems are documented on the ServiceMode page.


 
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