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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
  • reduce science data

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 are processed by QC Garching to obtain calibration solutions. These solutions come as

  • calibration product fits file frames (e.g. dark or twilight flat frames)
  • calibration product paf (e.g. zeropoints)
 
TYPES OF RAW CALIBRATION DATA

 

FITS headers
frame
.txt
DARK
TW_FLAT
SKY_FLAT
LAMP_FLAT
ZEROPOINT


The following types of raw calibration data exist for the NACO IMAGINGmode

frameDPR TYPEPurpose
typical number taken per night and setting
DARKDARKdetector status, dark level, RON, hot pixels
3
TWILIGHT FLATSKY,FLATfixed pattern noise, vignetting, odd-even columns effect, bad pixels
10
SKY FLAT SKY,FLATas Twilight flats
15-25
LAMP FLATLAMP,FLATfixed pattern noise, vignetting
3 ON and three OFF frames
ZEROPOINTSSTDstandard stars for photometric zeropoints
5

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

frameDPR TYPEPurpose
typical number taken per night and setting
LAMP FLATLAMP,FLATfixed pattern noise, vignetting
3 ON and three OFF frames
STANDARD STARSTDpolarimetric standard star
--

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

frameDPR TYPEPurpose
typical number taken per night and setting
LAMP FLATLAMP,FLATfixed pattern noise, vignetting, fringes
3 ON and three OFF frames
ARCLAMP,ARCwavelength dispesrion solution
1 ON and one OFF frame
STANDARD STARSTDtelluric absorption lines, flux calibration
2
 [top]CALIBRATION PRODUCTS

  

calibration recipes
naming scheme


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

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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_twflatcreate 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_twflatcreate a master skyflat and checks detector linearity from set of 10 raw imageFLAT FRAME, BAD PIXEL MAP, ERROR MAP, (INTERCEPTION MAP)
LAMP FLAT[fmt_th1.gif, 2K]naco_img_lampflatcreate a master skyflat and checks gain, lamp flux and fixed pattern noiseFLAT FRAME, QC PAF
ZEROPOINT [fmt_th1.gif, 2K]naco_img_zpointobtain photometric zeropoint
ZEROPOINT PAF

* not produced by QC Garching

 

Naming scheme

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

 

 [top]CALIBRATION CASCADE
[fmt_th1.gif, 2K]

NACO calibration
cascade (9K)


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.

 

 [top]OTHER CALIBRATION TABLES


list of flux standards

flux standards page

 


(under construction)

 

[top]ACTUAL PROBLEMS AND ISSUES
 

 

NACO Pipeline problems are documented under on the ServiceMode page.


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