HST Data Handbook for COS

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 RANDCORR: Add Pseudo-Random Numbers to Pixel Coordinates
    3.4.6 TEMPCORR: Temperature-Dependent Distortion Correction
    3.4.7 GEOCORR and IGEOCORR: Geometric Distortion Correction
    3.4.8 DOPPCORR: Correct for Doppler Shift
    3.4.9 DEADCORR: Nonlinearity Correction
    3.4.10 FLATCORR: Flat Field Correction
    3.4.11 WAVECORR: Wavecal Correction
    3.4.12 DQICORR: Initialize Data Quality File
    3.4.13 X1DCORR: Locate and Extract 1-D Spectrum
    3.4.14 BACKCORR: 1D Spectral Background Subtraction
    3.4.15 FLUXCORR/TDSCORR: Conversion to Flux
    3.4.16 HELCORR: Correction to Heliocentric Reference Frame
    3.4.17 STATFLAG: Report Simple Statistics
    3.4.18 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 BRFTAB: Baseline Reference Frame Table
    3.7.5 GEOFILE: Geometric Correction File
    3.7.6 DEADTAB: Deadtime Table
    3.7.7 FLATFILE: Flat Field File
    3.7.8 BPIXTAB: Bad Pixel Table
    3.7.9 LAMPTAB: Template Calibration Lamp Spectra Table
    3.7.10 WCPTAB: Wavecal Parameter Table
    3.7.11 DISPTAB: Dispersion Coefficient Table
    3.7.12 XTRACTAB: 1-D Spectral Extraction Table
    3.7.13 PHOTTAB: Photometric Throughput Table
    3.7.14 TDSTAB: Time Dependent Sensitivity Table