QC documentation system: QC procedure std_ima_qc.prg for FORS2

This documentation is intended both for QC scientists and SciOps astronomers (who may want to ignore the technical information displayed in grey).
 
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NAME std_ima_qc.prg
VERSION 1.0 -- 08/2002 set mag-ap radius of 10arcsec to try to decrease errors (before was 20, but now the stars are not "defocused" so much with the onecal used now)
2.0 -- 04/2006 use SExtractor magnitudes instead of MIDAS MAG_AP after fixing MASK_TYPE
2.1 -- aligned.fmt modified to have Sextractor magnitudes in final output (after fixing MASK_TYPE)
2.2 -- 2009-04-30: fixed bug with instrumental zeropoints introduced by 2008-11-10
2.3 -- 2012-11-08: qc1Ingest -stable "U" introduced for FAP
SYNTAX MIDAS
CALL measureQuality
from $DFS_PRODUCT/STD_IMA/$DATE:
inmidas -P -j "@@ $DFO_PROC_DIR/std_ima_qc.prg $date $PF"
INSTRUMENT FORS2
RAWTYPE STD_IMA
PURPOSE shows STD_IMA product files for FORS2 QC assessment; the plots are later reviewed within certifyProducts. The first plot (std_ima_grap1.png) is stored as Postscript file in $DFO_PLT_DIR.
PROCINPUT ALIGNED_PHOTOMETRY_TABLE; STANDARD_REDUCED_IMAGE
QC1TABLE trending | table(s) in QC1 database:
fors2_zp_frame
TRENDPLOT trending | HealthCheck plot(s) associated to this procedure:
trend_report_ZEROPOINTS_BH_HC.html | trend_report_ZEROPOINTS_VH_HC.html | trend_report_ZEROPOINTS_R_HC.html | trend_report_ZEROPOINTS_I_HC.html
QC1PAGE trending | associated documentation:
zeropoints/zeropoints.html
QC1PLOTS
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std_ima_grap1.png
At the top the average zero point (corrected for airmass and colour terms and converted to electrons) its error, and the number of stars used for it, are given.
All stars are plotted with small blue squares. Stars with normalized absolute weights of more than 0.05 are marked by asterisks.
For more than 1 such star a linear regression zero point vs. colour is performed (green line).
For more than 3 stars stars lying away from the fit by more than 1 sigma (fit uncertainty) are marked as outliers (red squares).
The pipeline, however, does only a rejection of stars deviating by more than 0.3 mag from the median to brighter zeropoints.
So the number of stars given at the top will usually deviate from the number of black asterisks.
std_ima_disp1.png
full display of reduced image with the positions of the identified standard stars with normalized absolute weights > 0.05 marked by red circles.
QC1PARAM QC1 parameters written into QC1 table:
QC1db names: num_stars | zp_frame | sig_zp_frame | ext_coeff | err_ext_coeff
FITS key names: QC ZPOINT NSTARS | QC ZPOINT | QC ZPOINTRMS | QC EXTCOEFF | QC EXTCOEFFERR
ALGORITHM Description of algorithms:
CERTIF Reasons for rejection:
- mis-identifications (e.g. standard stars identified outside the field of view)
Elliptical shapes are not a cause for rejection.
COMMENTS It is usual that for a given series of STD_IMA observations only one chip gives a zeropoint. Usually the sequence is then repeated for the other chip.
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