During normal VST/OmegaCAM operations a single, quick-check, DOME
flat frame is taken to test the health of the instrument and the dome
flat lamp. Most frequently, the quick-check dome flat is made using
the r_SDSS filter and dome flat lamp1 (FFLS1). The pipeline applies a
bias-correction, trims the images, and creates a table with frame
statistics (mean, median, and standard deviation) for each
The pipeline creates one output fits table from its quick-check
dome flat recipe (omega_qcheck):
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one.
The QC1 health check plots for the RAW OmegaCAM dome flats are
divided into 5 separate linked pages, each monitoring the flux level
and rms with two dome flat lamps (FFLS1 and FFLS2 as read from the
header keywords: INS.LAMP1.ID or INS.LAMP2.ID), and a detailed look at
the flux level of six detectors.
Main dome flat lamp FFLS1 (lamp1) showed failing trend. Decision was taken to swap the role of the lamps and treat the FFLS2 (lamp2) as the main one. HealthCheck plots for "dome:quick_check" were reorganized accordingly. Later it became clear that the decrease in flux was due to installation of the baffling system on 2014-01-08 and further on 2014-04-06.
Dome flat lamp FFLS1 (lamp1) again considered as the main lamp used for monitoring. HealthCheck plots for "dome:quick_check" were reorganized accordingly.
CCD_75 has been failing over the last several days, replaced (PPRS-073742)