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FORS2:
spec. efficiency
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FORS2 trending system: HEALTH CHECK report
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Last update: 2014-07-11T02:05:07 (UT)
  | now: 2014-07-11T12:55:29 (UT) muc01 QC pipeline: fors2-4.9.24 (installed 2014-03-11)
same group: 300V 600B,1200B
General news:
FORS2 news:  
Report news:
DATE*: [?] 2014-07-04
report | NLT
2014-07-05
report | NLT
2014-07-06
report | NLT
2014-07-07
report | NLT
2014-07-08
report | NLT
2014-07-09
report | NLT
2014-07-10
report | NLT
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*Date on this monitor changes at 21:00 UT
Print: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
Plot
?
Symb
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Source
*
OPS?
**
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB no MEDIAN 0.198 NONE none  9 efficiency_4 this | last_yr | all Relative efficiency for grism 600B, no filter (upper CCD), range 4900A; all lss_slit_pos are plotted here
2 QC1DB no MEDIAN 0.267 NONE none  3 efficiency_3 this | last_yr | all Relative efficiency for grism 1200B, no filter (upper CCD), range 4500A; all lss_slit_pos are plotted here

3 QC1DB no none   NONE none  9 efficiency_1 this | last_yr | all Chromatic efficiency plot for grism 600B, no filter; the values trended in plot are marked. The plot is constituted from the following wavelength ranges: 3700A
3 QC1DB no none   NONE none  9 efficiency_2 this | last_yr | all 4100A
3 QC1DB no none   NONE none  9 efficiency_3 this | last_yr | all 4500A
3 QC1DB no none   NONE none  9 efficiency_4 this | last_yr | all 4900A
3 QC1DB no none   NONE none  9 efficiency_5 this | last_yr | all 5300A
3 QC1DB no none   NONE none  9 efficiency_6 this | last_yr | all 5700A

4 QC1DB no none   NONE none  3 efficiency_1 this | last_yr | all Chromatic efficiency plot for grism 600B, no filter; the values trended in plot are marked. The plot is constituted from the following wavelength ranges: 3700A
4 QC1DB no none   NONE none  3 efficiency_2 this | last_yr | all 4100A
4 QC1DB no none   NONE none  3 efficiency_3 this | last_yr | all 4500A
4 QC1DB no none   NONE none  3 efficiency_4 this | last_yr | all 4900A

*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: OPSLOG data are included
Plot 1
scores: not implemented
data source:fors2_response
(QC1 database)
dataset:efficiency_4
median:0.198NONE
thresholds:none 
N_data plotted:9
[click on plot for closeup]
Plot 2
scores: not implemented
data source:fors2_response
(QC1 database)
dataset:efficiency_3
median:0.267NONE
thresholds:none 
N_data plotted:3
[click on plot for closeup]
Plot 3
scores: not implemented
data source:fors2_response
(QC1 database)
dataset:
(numbers below apply to this dataset)
efficiency_1
average:none
thresholds:none
N_data plotted:9
[click on plot for closeup]
Plot 4
scores: not implemented
data source:fors2_response
(QC1 database)
dataset:
(numbers below apply to this dataset)
efficiency_1
average:none
thresholds:none
N_data plotted:3
[click on plot for closeup]
This plot

The spectrophotometric standard star observations are taken within three days of the corresponding science observations and are meant to provide a response curve for data reduction. They can also be used to determine the efficiency of the spectroscopic modes of FORS2, provided they have been taken under photometric conditions which however is not guaranteed.

Plotted here are:
a) values for the relative efficiency of the system 'telescope + spectroscopic arm of FORS2' (top), at a representative wavelength (indicated in the comment); these values can be used for trending
b) all values for the grism and the order separation filter of the upper plot, displayed over wavelength to obtain a chromatic overview (bottom); the date range is the same as for the upper plot.

Only data points for the upper CCD are plotted. The lower CCD usually has no standard stars and no response curve.

The best current estimate of the efficiency of the spectroscopic modes of FORS2 is the upper envelope of the data points in the upper panel. Under 'data downloads' you find further information regarding the photometric stability of the night ('S' if stable, 'N' if unstable, 'U' if unknown).

More information can be found on the plot tutorial page  


General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • 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