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XSHOOTER trending system: HEALTH CHECK report
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Last update: 2024-06-16T22:37:51 (UT)
  | now: 2024-06-17T01:40:10 (UT) muc02 QC pipeline: xshoo-3.6.5a (installed 2023-09-18)
same group: flat_HC_IFU slice_rms   flat_IFU flat_SLIT arc_lamp D2_spectrum QTH_spectrum SLIT stdev
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.
The links to KMOS, UVES, and ESPRESSO have been moved to a new section (qcFlow operational) at the lower part of the navigation bar.
XSHOOTER news:  
Report news:
DATE*: [?] 2024-06-10
report | NLT
2024-06-11
report | NLT
2024-06-12
report | NLT
2024-06-13
report | NLT
2024-06-14
report | NLT
2024-06-15
report | NLT
2024-06-16
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 0.85 flux_ratio none  31 flat_spec_a2 this | last_yr | all current flat / reference flat = a + b * (lam - lam0)
2 QC1DB MEDIAN 0.0186 1/nm none  31 flat_spec_b2 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_a2
median:0.85flux_ratio
thresholds:none 
N_data plotted:31
[click plot for closeup]
Plot 2
scores: not implemented
data source:xshooter_flat
(QC1 database)
dataset:flat_spec_b2
median:0.01861/nm
thresholds:none 
N_data plotted:31
[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