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FORS2:
polarization optics
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FORS2 trending system: HEALTH CHECK report
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Last update: 2024-10-31T21:20:34 (UT)
  | now: 2024-10-31T23:29:26 (UT) muc01 QC pipeline: fors-5.6.10 (installed 2024-04-19)
same group: angle_offset pol_offset instr_pol
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:  
Report news:
DATE*: [?] 2024-10-24
report | NLT
2024-10-25
report | NLT
2024-10-26
report | NLT
2024-10-27
report | NLT
2024-10-28
report | NLT
2024-10-29
report | NLT
2024-10-30
report | NLT
2024-10-31
report | NLT
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*Date on this monitor changes at 21:00 UT
png: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
Plot
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Symb
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Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 .QC1DB none   NONE VAL-1,2 13 l_offset this | last_yr | all instrumental polarization (in units of sigma) for all bands
1 QC1DB none   NONE none  2 l_offset this | last_yr | all instrumental polarization (in units of sigma) for the B band
1 QC1DB none   NONE none  4 l_offset this | last_yr | all instrumental polarization (in units of sigma) for the V band
1 QC1DB none   NONE none  5 l_offset this | last_yr | all instrumental polarization (in units of sigma) for the R band
1 QC1DB none   NONE none  2 l_offset this | last_yr | all instrumental polarization (in units of sigma) for the I band
2 .QC1DB none   NONE none  13 err_l_offset this | last_yr | all sigma of the instrumental polarization for all bands
2 QC1DB none   NONE none  2 err_l_offset this | last_yr | all sigma of the instrumental polarization for the B band
2 QC1DB none   NONE none  4 err_l_offset this | last_yr | all sigma of the instrumental polarization for the V band
2 QC1DB none   NONE none  5 err_l_offset this | last_yr | all sigma of the instrumental polarization for the R band
2 QC1DB none   NONE none  2 err_l_offset this | last_yr | all sigma of the instrumental polarization for the I band
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
scores: 1|
data source:fors2_std_pmos
(QC1 database)
dataset:
(numbers below apply to this dataset)
l_offset.
average:none
fixed thresholds:-1...2NONE
N_data plotted:13
[click plot for closeup]
Plot 2
scores: not implemented
data source:fors2_std_pmos
(QC1 database)
dataset:
(numbers below apply to this dataset)
err_l_offset.
average:none
thresholds:none
N_data plotted:13
[click plot for closeup]
This plot

For unpolarized standard stars the pipeline determines the measured value. 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.
Values significantly different from zero might indicate instrumental polarization. Since the error of the polarization plays an important role here we plot it in the lower panel.
Only data with an error below 0.5 in instrumental polarization are trended.

The corresponding instruments polarization normalized with its error used to be monitored. However, since 2024-04 we have been monitoring the actual value of the polarization.
 


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