31.7 Post-Calibration Output Files

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Output Calibrated FOS Data Files

Filename Extension	File Contents
.c0h and .c0d	Calibrated wavelengths
.c1h and .c1d	Calibrated fluxes
.c2h and .c2d	Calibrated statistical error
.c3h and .c3d	Special mode data
.cqh and .cqd	Calibrated data quality
.c4h and .c4d	Count rate object and sky spectra
.c5h and .c5d	Flatfielded object count rate spectrum
.c6h and .c6d	Flatfielded sky count rate spectrum
.c7h and .c7d	Background count rate spectrum
.c8h and .c8d	Flatfielded and sky subtracted object count rate spectrum

If the reference files and reference tables used in the pipeline processing do not reflect the actual instrument performance, calibration errors can occur, which can lead to artificial features in the calibrated science data. In the next chapter, we address a variety of sources of error in FOS calibration and assess limiting accuracies in the STScI instrument calibration.

Figure 31.9: Partial Sample Post-COSTAR FOS .c1h Header

GCOUNT  =                   77 /


        / FOS DATA DESCRIPTOR KEYWORDS


INSTRUME= 'FOS               ' / instrument in use


ROOTNAME= 'Y3JK0709T         ' / rootname of the observation set


FILETYPE= 'FLX     '           / file type


BUNIT   = 'ERGS/CM**2/S/A'     / brightness units





        / CALIBRATION FLAGS AND INDICATORS


GRNDMODE= 'RAPID-READOUT     ' / ground software mode


DETECTOR= 'BLUE              ' / detector in use: amber, blue


APER_ID = 'B-2               ' / aperture id


POLAR_ID= 'C                 ' / polarizer id


POLANG  =                  0.0 / initial angular position of polarizer


FGWA_ID = 'H13               ' / FGWA id


FCHNL   =                    0 / first channel


NCHNLS  =                  512 / number of channels


OVERSCAN=                    5 / overscan number


NXSTEPS =                    4 / number of x steps


YFGIMPEN=                    T / onboard GIMP correction enabled (T/F)


YFGIMPER= 'NO                ' / error in onboard GIMP correction (YES/NO)





        / CALIBRATION REFERENCE FILES AND TABLES


DEFDDTBL=                    F / UDL disabled diode table used


BACHFILE= 'yref$b3m1128my.r0h' / background reference header file


FL1HFILE= 'yref$e7813577y.r1h' / first flat-field header file


FL2HFILE= 'N/A               ' / second flat-field header file


IV1HFILE= 'yref$e3h14503y.r2h' / first inverse sensitivity header file


IV2HFILE= 'N/A               ' / second inverse sensitivity header file


AISHFILE= 'yref$fac08361y.r8h' / average inverse sensitivity header file


RETHFILE= 'N/A               ' / waveplate retardation header file


DDTHFILE= 'yref$d9h1244ay.r4h' / disabled diode table header file


DQ1HFILE= 'yref$b2f1306ry.r5h' / first data quality initialization header file


DQ2HFILE= 'N/A               ' / second data quality initialization header file


CCG2    = 'mtab$a3d1145ly.cmg' / paired pulse correction parameters table


CCS0    = 'ytab$a3d1145dy.cy0' / aperture parameters


CCS1    = 'ytab$aaj0732ay.cy1' / aperture position parameters


CCS2    = 'ytab$a3d1145fy.cy2' / sky emission line regions


CCS3    = 'ytab$a3d1145gy.cy3' / bkg and sky filter widths


CCS4    = 'ytab$e5v13262y.cy4' / polarimetry parameters


CCS5    = 'ytab$a3d1145jy.cy5' / sky shifts


CCS6    = 'ytab$e5v11576y.cy6' / wavelength coefficients


CCS7    = 'ytab$ba910502y.cy7' / GIMP correction scale factors


CCS8    = 'ytab$ba31407ly.cy8' / predicted background count rates


CCS9    = 'ytab$e3i09491y.cy9' / scattered light parameters


CCSA    = 'ytab$fad1554cy.cya' / OTA focus history


CCSB    = 'ytab$g1512585y.cyb' / relative aperture throughput coeff


CCSC    = 'ytab$fad1554hy.cyc' / aperture throughput vs OTA focus


CCSD    = 'ytab$fad1554ky.cyd' / time changes in sensitivity





        / CALIBRATION SWITCHES


CNT_CORR= 'COMPLETE'           / count to count rate conversion


OFF_CORR= 'OMIT              ' / GIMP correction


PPC_CORR= 'COMPLETE'           / paired pulse correction


BAC_CORR= 'COMPLETE'           / background subtraction


GMF_CORR= 'COMPLETE'           / scale reference background


SCT_CORR= 'COMPLETE'           / scattered light correction


FLT_CORR= 'COMPLETE'           / flat fielding


SKY_CORR= 'SKIPPED '           / sky subtraction


WAV_CORR= 'COMPLETE'           / wavelength scale generation


FLX_CORR= 'OMIT              ' / flux scale generation


APR_CORR= 'COMPLETE'           / aperture throughput corrections


AIS_CORR= 'COMPLETE'           / AIS flux scale generation


TIM_CORR= 'COMPLETE'           / time changes in sensitivity correction


ERR_CORR= 'COMPLETE'           / propagated error computation


MOD_CORR= 'PERFORM           ' / ground software mode dependent reductions





HISTORY   FL1HFILE=yref$e7813577y.r1h       FLT_CORR=COMPLETE


HISTORY   INFLIGHT  01/03/1994


HISTORY   Based on SMOV Superflats: proposal 4776


HISTORY   AISHFILE=yref$fac08361y.r8h       AIS_CORR=COMPLETE


HISTORY   INFLIGHT 01/02/1994 - 15/07/1995


HISTORY   1st delivery: post-costar ais time+aperture dependent flux cal


END

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Last updated: 01/14/98 14:47:13