Description of the calibration process.

Focus the instrument

On an ipython console at NEMEA, write:

> import SpecFocus
> res = SpecFocus.focus_loop(stage_control, du_control, focus_pos = np.arange(3.0, 3.5, 0.05))
> SpecFocus.analyze(res)

Select the value with the maximum value in the figure for the focus.



Exposure of 15s. Should get around 10k counts on the brightest spots.


Exposure of 15s.


Early arcs did not show great S/N with 15s. Just above the bias limit. At later time, 15s did provide the right number of counts. Exposure of 15s.


Wait 3 min to warm up. Exposure of 15s.

Dome flats

Power up the telescope if down. Select 'dome' in the control window. Click 'Calibration'. Once calibration is selected, the lamps open.

Select 'flat stow' and Telescope.

Focusing the telescope

  • Take a rainbow camera image.
  • Once we see it in the rc, select the arrow from the centroid of the object to the centre of the IFU pointing circle.
  • Repeat with exposures until the object is entered in the circle.
  • Press button 'To IFU', to move the object to the IFU.
  • Examine the IFU image.
  • Take focus loop. Predicted focus for GRB is 14.85. Finer step of 0.05 may be used.

Starting the Telescope Control Menu

  • Open a Pylab64 console.
  • Type: 'import Telescope_Control'
  • Type: 'Telescope_Control.interactive()' to obtain the interactive menu to the telescope.

STD star

  • Select the coordinates of the star in the list.
  • Identify the STD in the rainbow camera.
  • Offset the telescope to fit the STD in the circle of the IFU.
  • Click 'ToIFU'.
  • Select the parameters of the spectra: time

Exposure time suggestions for STD:

  • 10 - 11 mag --> 120s
  • 11 - 12 mag --> 240s
  • 12 - 13 mag --> 360s
  • 13 - 14 mag --> 500s

-- NadiaBlagorodnova - 17 Nov 2015

-- NadiaBlagorodnova - 19 Nov 2015

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Topic revision: r3 - 2015-11-19 - NadiaBlagorodnova
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