Calibration Plan

Standard Calibrations

The most commonly used observing configurations of each instrument are calibrated by means of the Observatory's Calibration Plan. Calibration Plans for each instrument and mode are described in detail in their corresponding User Manual, and their execution times are not charged to the Service Mode programmes.

Additional Calibrations

Please check carefully in the User Manual whether or not the instrument configurations that you plan to use are included in the instrument's Calibration Plan. If this is not the case, you must provide additional OBs for calibration appropriate for each mode not included in the Calibration Plan. Their execution time is then charged to your time allocation.

User-supplied OBs for calibration are only executed once. You should assume that your science OBs will be executed completely independently of each other, possibly on different nights, and take into account that no user-supplied OB (for a science or a calibration target) will be executed more than once. You should submit enough OBs to cover that situation. For example, if you need to observe and flux-calibrate six targets in a filter that is not supported by the calibration plan of the instrument, you need to provide six OBs for photometric calibration to allow for the case in which each target is observed on a different night. This must be done even if the same calibration star can be used for all the science targets.

Please indicate in the User Comments fields of science OBs when a user-provided calibration must be executed contiguously.

'Concatenation containers' should be used within p2 to link science and calibration observations that must be executed contiguously.

Please note that there are two separate kinds of calibrations in operational terms:

  • Calibrations that observe a reference celestial source, like a spectrophotometric standard star or a nearly-featureless star for the measurement of telluric lines. The OBs prepared for this kind of calibration are generically considered as normal OBs (to be prepared within an "OB" in p2), and their construction is the same as for other science OBs. However, depending of the instrument they use either templates whose name contains the indicator calib, or flags in the templates that indicate that the observation is intended for calibration.
  • Calibrations with no celestial source associated, like flat fields taken with a flat field lamp or dark exposures. OBs for this kind of calibration should be prepared within the "CB" (Calibration Block) in p2, as no acquisition template needs to be specified in this case. Calibrations to be executed in daytime are the most common examples in this category.

MUSE Calibration Plan

The MUSE instrument is calibrated by the Science Operations staff in the morning after the science observations. All instrument setups used for science observations in the night are calibrated automatically.

The standard calibration products provided by the Observatory are given on the MUSE Overview page and in the MUSE User Manual.

Flux Calibration

The current version of the MUSE pipeline allows to derive the flux calibration curve ONLY if a spectrophotometric standard star selected from the following list has been observed. Data obtained with the MUSE_wfm_cal_specphot or MUSE_wfm_cal_telluric templates for standards different from the sample below cannot be processed by the muse_standard pipeline recipe.


   Name    RA   Dec  
WD0308-565 03 09 48.241 -56 23 48.20
EG21 03 10 31.153 -68 36 05.29
GD71 05 52 27.614 +15 53 13.75
HD49798 06 48 04.690 -44 18 58.40
LTT3218 08 41 32.500 -32 56 34.00
GD108 10 00 47.254  -07 33 31.01
GD153 12 57 02.337   +22 01 52.68
EG274 16 23 33.837 -39 13 46.15
GJ7541A 19 20 34.92 –07 40 00.0
LTT7987 20 10 56.846 -30 13 06.639
21 32 16.239 +00 15 14.40
Feige110 23 19 58.398 -05 09 56.16


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