Documentation of QC procedures: procedure sci_mos_qc_2CCD.prg for FORS1

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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bias_qc_2CCD.prg dark_qc_2CCD.prg detmon_qc.prg
flat_scr_qc_2CCD.prg lamp_std_qc_2CCD.prg lamp_lss_qc_2CCD.prg lamp_mos_qc_2CCD.prg
flat_sky_qc_2CCD.prg std_ima_qc_2CCD.prg std_lss_qc_2CCD.prg std_mos_qc_2CCD.prg
sci_img_qc_2CCD.prg sci_lss_qc_2CCD.prg sci_mos_qc_2CCD.prg
 
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NAME sci_mos_qc_2CCD.prg
VERSION 1.0 -- adapted for new pipeline (SM, 10/2006)
1.0 -- adapted for new CCDs (SM, 04/2007)
SYNTAX MIDAS
CALL measureQuality
from $DFS_PRODUCT/SCI_MOS/$DATE:
inmidas -P -j "@@ $DFO_PROC_DIR/sci_mos_qc.prg $date $PF"
INSTRUMENT FORS1
RAWTYPE SCI_MOS
PURPOSE compares raw and product SCI_MOS files for FORS1 QC assessment; the plots are later reviewed within certifyProducts and stored in $DFO_PLT_DIR.
PROCINPUT raw image from AB; SCI_MOS product;
QC1TABLE trending | table(s) in QC1 database:
fors1_sci_mos
TRENDPLOT trending | HealthCheck plot associated to this procedure: none
QC1PAGE trending | associated documentation: none
QC1PLOTS
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sci_mos_grap1.png
extracted, sky-subtracted spectra of 4 brightest sources (black) with error spectrum (red) and extracted sky background for brightest objects (green)
sci_mos_grap2.png
position of a bright sky line along the slitlets

sci_mos_disp1.png
full display of reduced frame

sci_mos_disp2.png
full display of raw frame
QC1PARAM QC1 parameters written into QC1 table:
QC1db names: skyline_position | skyline_rms | skyline_offset | skyline_number | avg_accuracy
QC1 params created by pipeline: avg_accuracy (from wavelength calibration data)
QC1 params created by this procedure: all others
ALGORITHM Description of algorithms:
The whole rebinned frame is searched for emission lines.
Then lines within +/- 1 pixel around skyline_position are selected and their offset with respect to the reference line is determined.
The mean and rms of these offsets are stored in skyline_offset and skyline_rms.
The number of skylines used is stored in skyline_number
CERTIF Reasons for rejection:
- many missing slitlets or many slitlets with bad wavelength calibration
- many curved slitlets
- if only a few slitlets are missing or badly calibrated (offsets in sky lines, curved lines) just add a comment and certify.
- skyline offsets of more than 0.3 pixels violate the nominal calibration accuracy,
but may be due to temperature differences between science and calibration data and
are no cause for rejection
COMMENTS
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