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NACO Pipeline:
Calibration Data
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NACO CALIBRATION DATA: GENERAL

Calibration data for NACO are taken for two purposes:

  • assess the instrument status
  • generate master calibration products

Generally NACO calibration data are taken as daytime calibrations. On request of the user, also nighttime calibrations can be obtained as part of the Observing Block which generates the SCIENCE data ("attached calibrations").

All calibration data taken by NACO and supported by the NACO pipeline are processed by QC Garching to obtain calibration solutions. These solutions come as calibration product fits file frames.

TYPES OF RAW CALIBRATION DATA


The following types of raw calibration data exist for the NACO IMAGING mode
frame DPR TYPE Purpose
typical number taken per night and setting
DARK DARK detector status, dark level, RON, hot pixels
3
TWILIGHT FLAT SKY,FLAT fixed pattern noise, vignetting, odd-even columns effect, bad pixels
10
SKY FLAT SKY,FLAT as Twilight flats
15
LAMP FLAT LAMP,FLAT fixed pattern noise, vignetting
3 lamp=ON and three lamp=OFF frames
ZEROPOINTS STD standard stars for photometric zeropoints
5

The following types of raw calibration data exist for the NACO POLARIMETRY mode

frame DPR TYPE Purpose
typical number taken per night and setting
LAMP FLAT LAMP,FLAT fixed pattern noise, vignetting in polarimetry mode
3 ON and three OFF frames
STANDARD STAR STD polarimetric standard star
--

The following types of raw calibration data exist for the NACO SPECTROSCOPY mode (this mode was decommissioned science P97)

frame DPR TYPE Purpose
typical number taken per night and setting
LAMP FLAT LAMP,FLAT fixed pattern noise, vignetting, fringes
3 ON and three OFF frames
ARC LAMP,ARC wavelength dispersion solution
1 ON and one OFF frame
STANDARD STAR STD telluric absorption lines, flux calibration
2

CALIBRATION PRODUCTS


Recipes and products

The following NACO calibration products are created from raw calibration files (click here for a complete overview of calibration files and recipes):

raw frame(s)   recipe description
product(s)

DARK

[bias_th.gif 3K]

naco_img_dark

create a master dark from set of input raw frames and calculates the RON

MASTER_DARK, RON paf , hot pixel map, cold pixel map

TWILIGHT FLAT [fmt_th1.gif, 2K] naco_img_twflat create a master twilight flat and checks detector linearity from set of 10 raw image

FLAT FRAME, BAD PIXEL MAP, ERROR MAP, (INTERCEPTION MAP)

SKY FLAT [fmt_th1.gif, 2K] naco_img_twflat create a master skyflat and checks detector linearity from set of 10 raw image FLAT FRAME, BAD PIXEL MAP, ERROR MAP, (INTERCEPTION MAP)
LAMP FLAT [fmt_th1.gif, 2K] naco_img_lampflat create a master skyflat and checks gain, lamp flux and fixed pattern noise FLAT FRAME, QC PAF
ZEROPOINT [fmt_th1.gif, 2K] naco_img_zpoint obtain photometric zeropoint
ZEROPOINT

Naming scheme

After production and certification, the calibration products are renamed after a scheme which includes type, creation data and relevant NACO setting.


CALIBRATION CASCADE


NACO calibration frames requires a cascading scheme where the mutual dependencies of products and raw frames have to be respected. Some products (startrace tables, arc tables) can be produced from raw files only, but most products require the prior generation of other calibration products. 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 master flat is not only generated using an arbitrary quality-checked order table, but that specific table is chosen which at the moment of processing is closest in time.

All products created by QC Garching follow the calibration cascade.

TECHNICAL CALIBRATIONS


There are three types of technical calibrations supported by the NACO pipeline: SLIT (decommisioned in 2014), detector monitoring and checkAO. These calibrations are not used to calibrate science. The products of the detmon recipe are two fits tables, one documenting the non-linearity of the detetcor and one documenting the gain value. The checkAO recipe generates a dark subtracted image. The Strehl related parameters are stored in the product header.



 
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