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FORS2 trending system: KPI report
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Last update: 2025-09-09T16:30:26 (UT)
  | now: 2025-09-10T11:15:19 (UT) muc01 QC pipeline: fors-5.8.3 (installed 2025-05-12)
General news: NOTE: The Health Check and calChecker services are moved to qcFlow on an instrument by instrument basis. The current pages will not be updated any longer once the move has been finished.
FORS2 news:  
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scores&comments | history: all data plotted here | plot tutorial ... | contact | HC_docu...               [?] 		*Date on this monitor changes at 21:00 UT
png: Information and research:
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Plot
?		 Symb
?		 Source
*		 Average ? Thresholds ? N_
data		 QC1
parameter		 Data
downloads		 Remarks
method value unit method value
1 •QC1DB none   NONE none  54 rel_l_offset all (full time range) relative deviation from expected linear polarization for the B band
2 ♦QC1DB none   NONE none  94 rel_l_offset all (full time range) relative deviation from expected linear polarization for the V band
3 ▲QC1DB none   NONE none  234 rel_l_offset all (full time range) relative deviation from expected linear polarization for the R band
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:fors2_std_pmos
(QC1 database)
dataset:rel_l_offset•
average:none
thresholds:none
N_data plotted:54
(current) reference:0.5
[click plot for closeup]
Plot 2
data source:fors2_std_pmos
(QC1 database)
dataset:rel_l_offset♦
average:none
thresholds:none
N_data plotted:94
(current) reference:0.5
[click plot for closeup]
Plot 3
data source:fors2_std_pmos
(QC1 database)
dataset:rel_l_offset▲
average:none
thresholds:none
N_data plotted:234
(current) reference:0.5
[click plot for closeup]
This plot

This is the instrument performance plot for the FORS2 relative polarization offset.

For polarized standard stars the pipeline determines the difference between the measured linear polarization (Lobs) and the value tabulated in the catalogue (Lexpct). Since polarization parameters are usually tabulated for broad-band filters the pipeline selects the broad-band filter closest to the central wavelength of the grism. The difference is then normalized by dividing through the tabulated value.

The reference value (0.5) currently corresponds to the median of the measured values.  

General information

Click on any of the plots to see a close-up version.

The latest date is indicated on top of the plot.

If configured,

  • data points belonging to the latest date are specially marked
  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
  • you can download the data for each parameter set if the 'Data downloads' link shows up