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XSHOOTER Pipeline:
Calibration Data

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INTRODUCTION

Calibration data for XSHOOTER are taken for two purposes:

  • assess the instrument status
  • reduce science data

Generally, XSHOOTER calibration data are taken as daytime calibrations.

Please, refer to Chapter 4 of the XSHOOTER User Manual for details on the current calibration plan.

The calibration data taken obtained in the supported modes are processed by QC Garching to obtain calibration solutions. These solutions come as:

  • calibration product FITS file frames (e.g. master BIAS or FLATFIELD frames)
  • calibration product FITS tables (e.g. updated configuration tables)

RAW CALIBRATION DATA

The following types of raw calibration data exist (with arm being UVB, VIS, or NIR):


Frame Type DPR Type DPR Tech Purpose
LINEARITY_UVB
LINEARITY_VIS
BIAS,DETCHECK IMAGE gain, non-linearity and bad pixel map
FLAT,LINEARITY,DETCHAR IMAGE
LINEARITY_NIR FLAT,LINEARITY,DETCHAR ECHELLEN
BIAS_<arm> BIAS IMAGE bias level, RON
DARK_<arm> DARK IMAGE dark level
FMTCHK_<arm> LAMP,FMTCHK ECHELLE,PINHOLEN check of spectrum format
ORDERDEF_<arm> LAMP,ORDERDEFU ECHELLE,PINHOLEN order detection
WAVE_<arm> LAMP,WAVE ECHELLE,MULTI-PINHOLEN distortion coefficients
FLAT_SLIT_<arm> LAMP,FLATU ECHELLE,SLITN detection of order/slice edges, flat field calibration
FLAT_IFU_<arm> ECHELLE,IFUN
ARC_SLIT_<arm> LAMP,WAVE ECHELLE,SLITN line tilt, resolution, offset between SLIT/IFU and multi-pinhole
ARC_IFU_<arm> ECHELLE,IFUN
FLEX_IFU_<arm> LAMP,AFC ECHELLE flexure compensation
INS.OPTI2.NAME = SLOT
INS.OPTIn.NAME = Pin_0.5 (n = 3/4/5 for UVB/VIS/NIR)
FLEX_SLIT_<arm>
STD_TELL_SLIT_STARE_<arm> STD,TELLURIC ECHELLE,SLIT,STARE correction of telluric absorption in science spectra
STD_TELL_SLIT_NOD_<arm> ECHELLE,SLIT,NOD
STD_TELL_IFU_STARE_<arm> ECHELLE,IFU,STARE
STD_FLUX_IFU_OFF_<arm> STD,FLUX
STD,SKY
ECHELLE,IFU,OFFSET spectrophotometric calibration
STD_FLUX_SLIT_OFF_<arm> ECHELLE,SLIT,OFFSET
STD_FLUX_SLIT_NOD_<arm> STD,FLUX ECHELLE,SLIT,NOD

U: In UVB two lamps are used, a D2 and a quartz lamp (LAMP,DORDERDEF+LAMP,QORDERDEF and LAMP,DFLAT+LAMP,QFLAT)
N: For the NIR arm there is also an OFF frame for every ON frame with DPR.TECH=IMAGE.
MASTER CALIBRATION DATA AND PRODUCTS

The following types of master calibration data are produced for the supported modes:

Frame Type Recipe Description N Products
LINEARITY_<arm> xsh_lingain
detmon_ir/opt_lg
determine gain, linearity and bad-pixel map 37/
22N
table with gain and linearity information, bad pixel map
BIAS_<arm> xsh_mbias create a master bias from set of N input raw frames 3 master bias, bad pixel map
DARK_<arm> xsh_mdark create a master dark from set of N input raw frames 3 dark level, bad pixel map
FMTCHK_<arm> xsh_predict check of spectroscopic format 1N updated config table and/or tables with guesses for order and wave positions
ORDERDEF_<arm> xsh_orderpos order detection 1N,U table with positions of order centers
FLAT_SLIT_<arm> xsh_mflat detection of order edges, flat field calibration 5N,U table with order/slice edges, master flat field
FLAT_IFU_<arm>
WAVE_<arm> xsh_2dmap determine distortion coefficients 1N updated config table and/or wave map, slit map, and dispersion coefficients
ARC_SLIT_<arm> xsh_wavecal determine line tilts, spectral resolution and offsets between SLIT/IFU and multi-pinhole 1N tables with line tilt, resolution and offset
ARC_IFU_<arm>
FLEX_IFU_<arm> xsh_flexcomp determine shift between observed and predicted line position 1 table with shift
FLEX_SLIT_<arm>
STD_TELL_SLIT_STARE_<arm> xsh_scired_slit_stare process standard spectrum like SCIENCE data 1 reduced telluric standard star spectrum
STD_TELL_SLIT_NOD_<arm> xsh_scired_slit_nod 2
STD_TELL_IFU_STARE_<arm> xsh_scired_ifu_stare 1
STD_TELL_IFU_OFF_<arm> xsh_scired_ifu_offset 2
STD_FLUX_SLIT_OFF_<arm> xsh_respon_slit_offset process standard star spectrum to get response and efficiency 2 reduced standard star spectrum, response curve, and efficiency data
STD_FLUX_SLIT_NOD_<arm> xsh_respon_slit_nod
STD_FLUX_IFU_OFF_<arm> xsh_scired_ifu_offset process standard spectrum like SCIENCE data 2 reduced flux standard star spectrum

N: For the NIR arm there is also an OFF frame for every ON frame
U: In UVB two lamps are used, a D2 and a quartz lamp

CALIBRATION CASCADE

Like for all astronomical data, the reduction of XSHOOTER calibration frames requires a cascading scheme where the mutual dependencies of products and raw frames have to be respected. Master Biases and DARKs can be produced from raw files only, but all the other products require the prior generation of other calibration products. The proper sequence of all these production steps is called the calibration cascade.

NAMING SCHEME

After production and certification, the calibration products are renamed after a scheme which includes type, creation date and relevant XSHOOTER settings.


 
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