Chapter 3:
COS Calibration

3.1 Raw Data Compilation

3.2 Pipeline Processing Overview

3.3 Calcos: Structure and Data Flow

3.4 Descriptions of Spectroscopic Calibration Steps

3.4.1 Initialization

3.4.2 BRSTCORR: Search for and Flag Bursts

3.4.3 BADTCORR: Bad Time Intervals

3.4.4 PHACORR: Pulse Height Filter

3.4.5 WALKCORR: Y-Walk Correction

3.4.6 RANDCORR: Add Pseudo-Random Numbers to Pixel Coordinates

3.4.7 TEMPCORR: Temperature-Dependent Distortion Correction

3.4.8 GEOCORR and IGEOCORR: Geometric Distortion Correction

3.4.9 DOPPCORR: Correct for Doppler Shift

3.4.10 DEADCORR: Nonlinearity Correction

3.4.11 FLATCORR: Flat-field Correction

3.4.12 WAVECORR: Wavecal Correction

3.4.13 DQICORR: Initialize Data Quality File

3.4.14 STATFLAG: Report Simple Statistics

3.4.15 X1DCORR: Locate and Extract 1-D Spectrum

3.4.16 BACKCORR: 1D Spectral Background Subtraction

3.4.17 FLUXCORR/TDSCORR: Conversion to Flux

3.4.18 HELCORR: Correction to Heliocentric Reference Frame

3.4.19 Finalization (making the sum files)

3.5 Descriptions of Imaging Calibration Steps

3.6 Customizing COS Data Calibration

3.6.1 Mechanics of Tailored Recalibration

3.6.2 Using GO Wavecals

3.7 Reference Files

3.7.1 BRSTTAB: Burst Parameters Table

3.7.2 BADTTAB: Bad Time Interval Table

3.7.3 PHATAB: Pulse Height Discrimination Table

3.7.4 PHAFILE: Pulse Height Discrimination File

3.7.5 BRFTAB: Baseline Reference Frame Table

3.7.6 WALKTAB: Y Walk Correction Table

3.7.7 GEOFILE: Geometric Correction File

3.7.8 DEADTAB: Deadtime Table

3.7.9 FLATFILE: Flat-field File

3.7.10 BPIXTAB: Bad Pixel Table

3.7.11 LAMPTAB: Template Calibration Lamp Spectra Table

3.7.12 WCPTAB: Wavecal Parameter Table

3.7.13 DISPTAB: Dispersion Coefficient Table

3.7.14 XTRACTAB: 1-D Spectral Extraction Table

3.7.15 FLUXTAB: Photometric Throughput Table

3.7.16 TDSTAB: Time Dependent Sensitivity Table

3.7.17 GSAGTAB: Gain Sag Table

3.7.18 HVTAB: High Voltage Table

3.7.19 SPWCSTAB: Spectroscopic WCS Parameters Table