ITEM_TITLE Nasmyth flat lamp ITEM_ANAME nasmyth ITEM_REPORT NASLAMP Argus nasmyth flats (flattype=NAS) are acquired everytime the standard star efficiency monitoring is executed (every 1-2 months). Furthermore it may also be triggered by an Argus SCIENCE OB and a standard star exposure. These flats provide a better relative illumination than the robotic flats, so that the relative fibre signal level is more evenly distributed.

Nasmyth flats also exist for IFU1 and IFU2 but are so sparsely distributed over time and settings that a trending is impossible.

The parameter giraffe_flat..flattype is either ROB=robotic, or NAS=nasmyth. Here it is always NAS. TITLE QC1 parameters TABLE_NAME qc1_parameter TABLE_TYPE QC1_TABLE TABLE_ROW1 [calculated by QC procedure] SEP giraffe_flat..flux TABLE_END TITLE Trending TABLE_NAME box1 TABLE_TYPE FIGURE_1 TABLE_WIDTH 80% TABLE_IMG1 "../img/nasmyth_2.png" width="348" height="398" border="1" TABLE_CAP1 Box 1: Nasmyth lamp efficiency (Argus, L543.1) TABLE_END

Box 1 of the trending plot displays the Argus L543.1 values. This setup is used by the Argus STD efficiency monitoring, and also complies with the setup used for the robotic flat lamp monitoring.

TABLE_NAME box2 TABLE_TYPE FIGURE_1 TABLE_WIDTH 80% TABLE_IMG1 "../img/nasmyth1.png" width="363" height="371" border="1" TABLE_CAP1 Box 2: Nasmyth lamp efficiency (all settings). Blue marks
TABLE_CAP1 the L543.1 values, green the HR settings, red the LR settings. TABLE_END

Box 2 in the trending report collects all existing nasmyth lamp data for Argus, to give an indication about the wavelength dependency of the lamp efficiency.

TITLE History TABLE_NAME histo1 TABLE_TYPE HISTORY (-->design; 2 columns date/event) TABLE_ROW1 NOWRAP around 2007-02 SEP flux in the L543.1 setting increased, to provide better statistics TABLE_END TITLE Scoring&thresholds In principle the same arguments apply as for the robotic flats. But the Nasmyth flats taken very rarely (with the Nasmyth screen, costly in terms of nighttime or twilight time), as part of Argus science OBs. Therefore there are very few comparison points from the trending, so no scoring, and the thresholds are very loosely defined. TITLE Algorithm The average flux is obtained by dividing the average signal in the first raw file by the EXPTIME.