I.- Relative Spectral Response: Corrected of green light contamination II.-Flat Fields with Internal Calibration Lamps during Commissioning Luisa M. Lara IAA-CSIC Granada (SPAIN)

Green light contamination in the UV range. WAC Relative Spectral Response – Data from Sept. ’01, warm CCD at T=292 K NAC Relative Spectral Response – Data from Aug. ’01 and July ’03 with cold CCD (~190-200 K). Relative (and/or absolute) detector measurements not available for the NAC Delta Calibration. Green light contamination in the UV range.

Other OSIRIS UV filters (specially the NAC ones) are not in Lindau  a similar correction cannot be done for the Relative Spectral Response of the CCD#243 NAC FM.

II.-Flat Fields with Internal Calibration Lamps during Commissioning Luisa M. Lara IAA-CSIC Granada (SPAIN)

WAC and NAC “flats” (should be called “lamp images”) with Main Internal Calibration Lamp – Data from Slot 2b Commissioning (June ’04)

Available Data for Main Lamps WAC Available Data for Main Lamps Empty Red640 Green535 Vis610 Na589 NH2 571 OI 630

Lab Calibration Lab Calibration Commissioning Commissioning Green Empty Empty OI 630 Commissioning Commissioning Green Empty Empty OI 630

NAC Available Data Main ffp-vis, orange645 ffp-vis, green535 ffp-vis, blue480 ffp-vis, red740 ffp-vis, ffp-ir Ortho800, ffp-ir Near-ir, ffp-ir ffp-vis, hydra700 Fe2O3, ffp-ir

Processed images of the main internal calibration lamps acquired with filter combinations (ffp-vis,blue480), (ffp-vis,red740) and (ffp-vis,ffp-ir) Lab Calibration Commissioning

FFP-Vis, Orange 645

Lab Calibration Commissioning Average in columns (solid line) and in rows (dotted line) of a normalized* image of the main and internal calibration lamps acquired with filter combination (ffp-vis,red740). Lab Calibration Commissioning Normalization with the mean value in a squared area of 200x200 pixels around the central pixel of the CCD. Normalization with the median

Conclusions There WAS a noticeable difference between the CCD spectral response measured in the lab and in the OSIRIS Calibration setup at wavelengths shorter than ~350 nm, either for the WAC FM and the NAC Pre-FM. Problem of green light contamination in the UV range of the monochromator is being assessed. Main Internal Calibration Lamps performance during commissioning remains as during the ground calibration.