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XSHOOTER trending system: HEALTH CHECK report
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Last update: 2022-10-03T16:25:01 (UT)
  | now: 2022-10-03T17:30:15 (UT) muc02 QC pipeline: xshoo-3.6.0 (installed 2022-03-21)
same group: flat_HC_IFU slice_rms   flat_IFU flat_SLIT arc_lamp spectrum SLIT stdev
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XSHOOTER news:  
Report news:
DATE*: [?] 2022-09-26
report | NLT
2022-09-27
report | NLT
2022-09-28
report | NLT
2022-09-29
report | NLT
2022-09-30
report | NLT
2022-10-01
report | NLT
2022-10-02
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 MEDIAN 0.892 flux_ratio none  30 flat_spec_a this | last_yr | all current flat / reference flat = a + b * (lam - lam0)
2 QC1DB MEDIAN -2.18 1/nm none  30 flat_spec_b this | last_yr | all current flat / reference flat = a + b * (lam - lam0)
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
scores: not implemented
data source:xshooter_flat
(QC1 database)
dataset:flat_spec_a
median:0.892flux_ratio
thresholds:none 
N_data plotted:30
[click plot for closeup]
Plot 2
scores: not implemented
data source:xshooter_flat
(QC1 database)
dataset:flat_spec_b
median:-2.181/nm
thresholds:none 
N_data plotted:30
[click plot for closeup]
This plot

This plot monitors XSHOOTER flat field spectra. For this reason flat field spectra are generated and are compared to a reference flat field spectrum.

We fit the flat field spectrum via the following linear formular:

current(lambda) = reference(lambda) * ( a + b * ( lambda - lambda_0 )

where lambda_0 is the center wavelength of the considered wavelength range, parameter a is the relative overall flux of the spectrum, corresponding to the lamp power and parameter b is a first order chromatic deviation (the slope between the reference flat spectrum and current flat spectrum). The reference spectrum is from 2015-10-24.

This plot shows both parameters a and b, of which paramter b is the important one.

On 2015-10-24, there is a=1 and b=0 by definition.

E.g. a = 1.22 means the current flux calibrated flat spectrum is 22% brighter than the flux calibrated reference spectrum.

A negative b (e.g. b = -1e-4) means the spectral slope of the current spectrum is less steep, hence blueer than the reference spectrum. In the trending plot, increasing b means the spectrum becomes redder, decreasing b means the spectrum gets more blue.  


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