Information On DQC Plots And Log
The two plots on the summary1.gif files use different colour codes for each filter:
- u : black
- g : yellow
- r : red
- i : cyan
- z : magenta
- Halpha : green
The plots on the summary2.gif files use different colour codes for each chip:
- Chip #1 : red
- Chip #2 : green
- Chip #3 : blue
- Chip #4 : cyan
On each plot, there is one dot per data product (catalogue). The 5-sigma magnitude limits are computed for the output product frames for each OB. Zeros for the seeing indicate no measure was possible and usually indicate a problem with the data for that detector.
SUMMARY FILE INFORMATIOn
Columns:- note the 18 entries, one for each detector or tile in running order 1-18 for each catalogue file summarised
- Run no. - filename using CASU naming convention
- Ext - extension number or "tl" if from tile catalogue
- Object Name - value from OBJECT keyword
- RA - recorded telescope Right Ascension
- Dec - recorded telescope Declination
- Equinox - value of EQUINOX keyword
- AM - average of start and finish airmass
- Date UT - as it says
- Exp - value of EXP_TIME (s) from header, this is equivalent to DIT
- Filt - filter name
- Seeing - average of FWHM (arcsec) for stellar sources on detector
- Sky - estimate of sky background per pixel (ADU)
- Noise - estimate of sky rms noise per pixel (ADU)
- Ellipt - average ellipticity of stellar sources on detector
- APcor - aperture correction for default "core" size (default 3 pixels radius, 2.0 arcsec diameter)
- STDrms - rms error (arcsec) in astrometric solution
- MagLim - estimate of 5-sigma limiting magnitude for stellar sources
- Totexp - product of DIT*NDIT*NJITTER (x2 if standard tile) i.e. total exposure time for majority of pixels
The colour codes used in the plots shown in the photom.gif are used
to show the different filters and use the same convention described
above for page 1 summary plots.
The points are the instrumental zero-points derived from standard stars cross-matches (+colour equations) using for now a nominal extinction values. The dashed lines gives a rough reference of the expected photometric zero point for a perfectly photometric night. The open dots on the rightmost part of the plot show for each filter the mean zero point and the corresponding error bar (variation) for the whole night.
The open circles in the data points are ones where the measured seeing is worse than 2 arcsec or the stellar ellipticity is worse than 0.3, i.e. the images are severely trailed.
The index files with the observation log for each night contain the following information:
- image name
- value of the PROJECT header keyword (Time-allocation code).
- TPA in degrees
- TPD in degrees
- value of the OBJECT keyword (Object name from telescope).
- value of the FILTER keyword (Filter name).
- value of the DIT keyword (Integration time per exposure [s]).
- value of the DATE-OBS keyword (Date time (UTC) of start of observation).
- value of the NDIT keyword (Numbers of coadds in the exposure)
- value of the NJITTER keyword (Number of positions in telescope jitter pattern).
- value of the JITTER_I keyword (Serial number in this telescope jittern pattern).
- value of the DET NCORRS keyword (Name of the camera readout mode).
13. value of the JITTER_X keyword (Offset in x [arcsec])
14. value of the JITTER_Y keyword (Offset in y [arcsec])