Recipe. The dark frames are processed into master dark product using visir_img_dark pipeline recipe and quality-checked by QC Garching.

QC checks. The QC parameters monitored are the dark current and the read-out-noise. Also, detectors' temperatures are read from the headers of the dark frames. The values of the qc1 parameters are accessible via trending page.

Products

QC parameters

Flat field frames

raw frame of the flat field for the imaging detector

Purpose. Flatfield frames are measured to monitor the technical performance of the imaging and spectroscopic detectors of VISIR. So far, they have not been meant to calibrate science data. The flatfield calibrations are used to monitor the gain, number of bad pixels, the bad pixel map, and to derive the Fixed Pattern Noise. They come in stacks of 7 raw frames (or less), where each frame corresponds to exposure with different temperature of the Warm Calibration Unit in the Extended Source mode. The temperature changes from -40 C to 20 C with 10 C step. The imaging detector flat field is taken daily during day-time calibrations in defined instrumental setup - INS.FILT1.NAME=PAH1, INS.PFOV=0,127.

Recipe. The flat field frames are processed into master flat product using visir_img_ff pipeline recipe and quality-checked by QC Garching.

QC checks. The QC parameter monitored is the namber of bad pixels. The values of the qc1 parameters are accessible via trending page.

Products

PRO.CATG contents IMG_FF, SPEC_FF average of seven raw frames IMG_BPM, SPEC_BPM bad pixel map

QC parameters

QC.NBBADPIX Number of bad pixels

 

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Imaging standard star frames

TPL.ID VISIR_img_cal_AutoChopNod DPR.CATG CALIB DPR.TECH IMAGE,CHOPNOD DPR.TYPE STD TAG IM_CAL_PHOT IMG_STD_CATALOG (additional static calib.) grouping INS.FILT1.NAME INS.PFOV recipe/call esorex visir_img_phot sof

raw frame of the imaging standard star; It is completely dominated by the thermal background radiation; You can only see the target by subtracting chopped/nodded raw frames from each other

Purpose. Imaging standard star frames are measured to obtain flux calibration and to monitor instrument response, ambient conditions, background, etc. They are quality-checked by QC Garching. All master calibrations are stored in the calibration database.

Recipe. The imaging standard star frames are processed using visir_img_phot pipeline recipe and quality-checked by QC Garching.

QC checks. The QC parameters monitored are sensitivity, conversion factor and mean of the sky background. The values of the qc1 parameters are accessible via trending page.

Products

PRO.CATG contents IMG_PHOT_COMBINED combined image IMG_PHOT_CONTRIB_MAP image contribution map

QC parameters

QC.BACKGD.MEAN estimated mean of the background QC.BACKGD.SIGMA estimated sigma of the background QC.FLUXTOT total measured flux of the star QC.FLUXSNR flux of the star for the best Signal/Noise ratio QC.FLUXSNR.NOISE noise for the best Signal/Noise ratio QC.FWHMX FWHM in x QC.FWHMY FWHM in y QC.FWHMX.POS1 FWHM in x of the first positive star QC.FWHMY.POS1 FWHM in y of the first positive star QC.FWHMX.POS2 FWHM in x of the second positive star QC.FWHMY.POS2 FWHM in y of the second positive star QC.FWHMX.NEG1 FWHM in x of the first negative star QC.FWHMY.NEG1 FWHM in y of the first negative star QC.FWHMX.NEG2 FWHM in x of the second negative star QC.FWHMY.NEG2 FWHM in y of the second negative star QC.SENSIT sensitivity (mJy/10sigma/1hr) QC.CONVER conversion factor (ADU/Jy) QC.STREHL strehl ratio QC.STREHL.ERROR error of the strehl ratio

 

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LR/MR/HR-slit spectroscopic standard star frames

TPL.ID VISIR_spec_cal_LRAutoChopNod DPR.CATG CALIB DPR.TECH SPECTRUM,CHOPNOD DPR.TYPE STD TAG SPEC_CAL_PHOT SPEC_STD_CATALOG (additional static calib.) SPEC_CAL_LINES (additional static calib.) SPEC_STD_QEFF (additional static calib.) grouping INS.FILT2.NAME, INS.GRAT1.NAME. INS.RESOL, INS.SLIT1.WID recipe/call esorex visir_spc_phot sof

raw frame of the LR spectroscopic standard star; It is completely dominated by the thermal background radiation; You can only see the spectrum by subtracting chopped/nodded raw frames from each other

Purpose. Spectroscopic standard star frames are measured to obtain constraints on the flux/wavelength calibration and to monitor instrument response, ambient conditions, background, etc. They are quality-checked by QC Garching. All master calibrations are stored in the calibration database.

Recipe. The spectroscopic standard star frames are processed using visir_spc_phot pipeline recipe and quality-checked by QC Garching.

QC checks. Currently, none of the QC parameters inferred from the spectroscopic star observations are monitored.

Products

PRO.CATG contents SPC_PHOT_COMBINED combined spectrum SPC_PHOT_TAB extracted spectrum as a table SPC_PHOT_WEIGHT weight map

QC parameters

QC.BACKGD.MEAN estimated mean of the background QC.XC cross-correlation of the observed v. model sky spectr. QC.XCSHIFT shift (pix) of model spectr. QC.PHDEGREE degree of the model dispersion polynomial QC.PHDISPX1 QC.PHDISPX0 QC.XCWLEN calibrated central wavelength QC.XCDEGREE degree of the calibrated dispersion polynomial QC.XCDISPX1 QC.XCDISPX0 QC.XFWHM FWHM at XCENTROI QC.XCENTROI x-centroid of the spectr. brightest object QC.SENS.MEAN mean of the spectroscopic sensitivities QC.SENS.STDEV standard deviation of spectroscopic sensitivities

 

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Echelle spectroscopic standard star frames

TPL.ID VISIR_spec_cal_HRXAutoChopNod DPR.CATG CALIB DPR.TECH ECHELLE DPR.TYPE STD TAG SPEC_CAL_PHOT_HRG SPEC_STD_CATALOG (additional static calib.) SPEC_CAL_LINES (additional static calib.) SPEC_STD_QEFF (additional static calib.) grouping INS.FILT2.NAME, INS.GRAT1.NAME. INS.RESOL, INS.SLIT1.WID recipe/call esorex visir_spc_phot_ech sof

raw frame of the echelle spectroscopy standard star

Purpose. Echelle standard star frames are measured to obtain constraints on the flux/wavelength calibration. They are quality-checked by QC Garching. All master calibrations are stored in the calibration database.

Recipe. The echelle standard star frames are processed using visir_spc_phot_ech pipeline recipe and quality-checked by QC Garching.

QC checks. Currently, none of the QC parameters inferred from the echelle star observations are monitored.

Products

PRO.CATG contents SPC_PHOT_HRG_COMBINED combined spectrum SPC_PHOT_HRG_TAB extracted spectrum as a table SPC_PHOT_HRG_WEIGHT weight map

QC parameters

QC.BACKGD.MEAN estimated mean of the background QC.XC cross-correlation of the observed v. model sky spectr. QC.XCSHIFT shift (pix) of model spectr. QC.PHDEGREE degree of the model dispersion polynomial QC.PHDISPX1 QC.PHDISPX0 QC.XCWLEN calibrated central wavelength QC.XCDEGREE degree of the calibrated dispersion polynomial QC.XCDISPX1 QC.XCDISPX0 QC.XFWHM FWHM at XCENTROI QC.XCENTROI x-centroid of the spectr. brightest object QC.SENS.MEAN mean of the spectroscopic sensitivities QC.SENS.STDEV standard deviation of spectroscopic sensitivities