Space Telescope Science Institute
STIS Data Handbook 6.0 May 2011
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Table of Contents

STIS Data Handbook
Preface
How to Use this Handbook
Handbook Structure
Typographic Conventions
Visual Cues
Comments
Chapter 1: STIS Overview
1.1 Instrument Capabilities and Design
1.1.1 The STIS Detectors
1.1.2 STIS Physical Configuration
1.2 Basic Instrument Operations
1.2.1 Target Acquisitions and Peakups
1.2.2 Routine Wavecals
1.2.3 Data Storage and Transfer
1.2.4 Parallel Operations
1.3 STIS Operations on Side 2
1.4 Failure of Side 2
1.5 STIS Closeout
1.6 Post Servicing Mission 4 Operation
1.7 STIS Operations and Calibration Timeline
Chapter 2: STIS Data Structure
2.1 Overview
2.2 Types of STIS Files
2.2.1 Trailer Files
2.2.2 Understanding Associations
2.3 STIS File Structures
2.3.1 STIS FITS Image Extension Files
2.3.2 STIS FITS Table Extension Files
2.4 Headers, Keywords, and Relationship to Phase II
2.5 Error and Data Quality Array
2.5.1 The Error Array
2.5.2 Data Quality Flagging
2.6 STIS Coordinate Systems
2.6.1 Spacecraft, User, and Aperture Frames
2.6.2 CCD Binned Pixel and Sub-array Coordinates
2.7 STIS Paper Products
Chapter 3: STIS Calibration
3.1 Pipeline Processing Overview
3.2 Structure of calstis
3.3 Data Flow Through calstis
3.4 Descriptions of Calibration Steps
3.4.1 ATODCORR: Analog to Digital Conversion Correction
3.4.2 BACKCORR: 1-D Spectral Background Subtraction
3.4.3 BIASCORR: Small Scale Bias Subtraction
3.4.4 BLEVCORR: Large Scale Bias & Overscan Subtraction
3.4.5 CRCORR: Cosmic Ray Correction
3.4.6 CTECORR: Correction for Charge Transfer Inefficiency Losses
3.4.7 DARKCORR: Dark Signal Subtraction
3.4.8 DISPCORR: Apply Dispersion Solution
3.4.9 DOPPCORR: Correct Reference Files for Doppler Shift
3.4.10 DQICORR: Initialize Data Quality File
3.4.11 EXPSCORR: Retain Individual CR-SPLIT Exposures
3.4.12 FLATCORR: Flat Field Correction
3.4.13 FLUXCORR: Conversion to cgs Flux
3.4.14 GEOCORR: Geometric Distortion Correction
3.4.15 GLINCORR and LFLGCORR: Nonlinearity Corrections
3.4.16 HELCORR: Correction to Heliocentric Reference Frame
3.4.17 LORSCORR: Conversion to Native Format MAMA Pixels
3.4.18 PHOTCORR: Populate Photometry Header Keywords
3.4.19 RPTCORR: Sum Repeated MAMA Observations
3.4.20 SC2DCORR: Echelle Scattered Light Correction
3.4.21 SGEOCORR: Small Scale Distortion Correction
3.4.22 SHADCORR: CCD Shading Correction
3.4.23 WAVECORR: Wavecal Correction
3.4.24 X1DCORR: Locate and Extract 1-D Spectrum
3.4.25 X2DCORR: Produce Rectified 2-D Spectral Image
3.5 Recalibration of STIS Data
3.5.1 Mechanics of Full Recalibration
3.5.2 Rerunning Subsets of the Calibration Pipeline
3.5.3 Improving the Treatment of Hot Pixels
3.5.4 Improving Cosmic Ray Rejection
3.5.5 Removing Fringes from Near-IR Spectral Data
3.5.6 Using GO Wavecals
3.5.7 Correcting the Orientation of Spectral Traces
3.6 Updates to calstis
3.6.1 Updates to calstis Since the STIS Closeout
Chapter 4: STIS Error Sources
4.1 Error Sources Associated with Pipeline Calibration Steps
4.1.1 Readout Noise and A-to-D Conversion
4.1.2 Bias Subtraction (only relevant for CCD observations)
4.1.3 Dark Current and Hot Pixels
4.1.4 Flat Fields
4.2 Summary of Accuracies
4.3 Factors Limiting Flux and Wavelength Accuracy
4.3.1 Flux Accuracy
4.3.2 Wavelength and Spatial Accuracies
Chapter 5: STIS Data Analysis
5.1 Data Reduction and Analysis Applications
5.1.1 STIS-Specific STSDAS Tasks
5.1.2 FITS Table Tasks
5.1.3 General Spectral Display and Analysis Tasks
5.1.4 MultiDrizzle for Image Combination
5.1.5 MULTISPEC for Slitless Spectral Images
5.2 Evaluating Target Acquisitions and Guiding
5.2.1 Target Acquisition Basics
5.2.2 ACQ Data
5.2.3 ACQ/Peak Data
5.2.4 The tastis Task
5.2.5 Guiding Error for Single Guide Star Mode
5.3 Working with Imaging Data
5.3.1 Sensitivity Units and Conversions
5.3.2 Spatial Information
5.3.3 Combining Images
5.4 Working with Spectral Images
5.4.1 Sensitivity Units and Conversions
5.4.2 Wavelength and Spatial Information
5.4.3 Improving the Rectification of Spectral Images
5.4.4 Combining Undithered Spectral Images
5.4.5 Combining Dithered Spectral Images
5.4.6 Producing Rectified Spectral Images for Long-Slit Echelle Data
5.5 Working with Extracted Spectra
5.5.1 Working With _x1d Files
5.5.2 Using the x1d Task to Recalibrate Data
5.5.3 Splicing Extracted Spectra
5.6 Working with TIME-TAG Data
5.6.1 Heliocentric and Barycentric Time Correction
5.6.2 Converting TIME-TAG Data to an Image
5.6.3 Echelle TIME-TAG Data
5.6.4 Timing Analysis Tasks
5.6.5 Merging TIME-TAG Event Tables
5.6.6 TIME-TAG Data Calibration

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