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ROSAT User's Handbook
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ROSAT User's Handbook
Contents
List of Figures
List of Tables
Acronyms and Abbreviations
Introduction
1.1 Mission Overview
1.2 Payload Description
Overview
Command and Data Handling System (CDHS)
Attitude Measurement and Control System (AMCS)
In-Orbit Performance
XRT Star Trackers (STC)
South Atlantic Anomaly Detectors (SAADs)
Coarse Sun Sensor (CSS)
Magnetometer
Data Storage and Transmission
1.3 Planned Mission Phases
Performance, Verification, and Calibration Observations (PVC)
All-Sky Survey
Pointed Observations
Wobble Mode
1.4 Observing Constraints
X-ray Telescope (XRT)
2.1 XRT Mirror Assembly (XMA)
XMA Support Structure
2.2 XMA/Detector Boresight Calibration
Boresight Calibration Results
2.3 Effective Area of the XMA
Reflectivity of Gold
Vignetting
Mirror Scattering
Calculated Effective Area
2.4 Angular Resolution of the XMA
XMA Scattering Profile
Off-Axis Blur of the XMA
2.5 XRT Coordinate Systems
Celestial Inertial Reference Frame ()
Cartesian Relative Coordinate System
ROSAT Coordinate System
Image Display Coordinate System
Position-Sensitive Proportional Counter (PSPC)
3.1 PSPC Overview
3.2 Operation
Low Pulse Height Tails
Rate-Gain Effect
Gas Control System
PSPC Gas Flow
PSPC Electronics
3.3 Quantum Efficiency of the PSPCs
PSPC Entrance Windows
Window Support Structure
X-ray Transmission of the Entrance Windows
UV Transmission of the PSPC Window and the UV Quantum Efficiency of the PSPC
PSPC Filter Wheel
Four Positions
Boron Filter
3.4 Spectral Property of the PSPC
PSPC Gain
Method of Determination
Spatial Variations
ADC Non-linearities
Gain Saturation
Temporal Gain Correction
Detector Response Matrices
92mar11 Matrix
93jan12 Matrix
Notes on the Spectral Response Matrices
MPE Notes on the Creation of the 1993 January Matrix
After-pulses
Spectral Recalibration Plans
3.5 Positional Property of the PSPC
Method of Position Determination
PSPC Spatial Resolution
Focus and Penetration Effects
Intrinsic Resolution of the PSPC
Linearization of the Event Positions
PSPC Readout System ()
Small Scale Non-linearity (Electronic Position Correction)
Large Scale Non-linearity (Window Correction)
Positional Response for Events With Small Pulse Heights (Ghost Images)
3.6 PSPC Background
Particle Background Reduction Method and Ground Measurements
Particle Background
Scattered Solar X-ray Background
Auroral Induced X-Ray Background
Cosmic X-ray Background
Other Possible Contributions to the Background
3.7 Dead Time of the PSPC
Dependence on Count Rate
Dependence on Pulse Height (Photon Energy)
Dead Time of Background Events
3.8 Timing of the PSPC Events
Characteristics of the PSPC plus XMA Instrument
4.1 Spatial Resolution
Focus and Penetration Effects
Gaussian Intrinsic Resolution and Mirror Blur Term
4.2 Mirror plus PSPC Response Matrices
Total Spectral Response Effective Area
Absolute Flux Calibration
High-Resolution Imager (HRI)
5.1 Introductory Remark
5.2 Performance of the HRI
Detector Geometry
Field of View
Plate Scale
Spatial Response
Absolute Positions
Pre-flight measurements
In-flight Point Spread Functions (PSFs)
On-Axis PSF
Off-Axis PSF
Effective Area
On-axis Effective Area
Off-axis Effective Area
Long-term stability
Source Count Rates
Background
Spectral Response
Spatial Gain Variations
Temporal Gain Variations
Spectral Response Matrix
Hardness Ratios
UV Response
Event Timing
High Voltage Increase
Hot spot Appearance
General
B.1 Spatial
Temporal
PHA
Viewing and Deleting
5.3 Feasibility of Observations
General Assumptions
Point Source Sensitivity
Flux of a Source - Gaussian Statistics Case
On-axis,
Off-axis,
Existence of a Source - Poissonian Statistics Case
Detection of Previously Unknown Sources Over a Field
Expected Count Rates (in detect cell = 50 of total)
Blackbody Spectrum Example
Power-law Spectrum Example
Raymond-thermal Spectrum Example
Time Variability Studies
Comparison to the Einstein HRI
Wide-Field Camera (WFC)
6.1 Description of the WFC
Mirrors
Detectors
Filters
Operational Modes
6.2 Performance of the WFC
Effective Area
Spatial Variations in Effective Area
Point Spread Function
Timing
Positional Accuracy
Background
UV Sensitivity
Guide to PSPC Calibration Observations
7.1 PSPC Calibration Tasks
Spatial Response
Point Spread Function
Ghost Images
Spectral Response
Temporal Response
Boresight
UV Leak
7.2 Calibration Target Notes
Standard Analysis Software System (SASS)
8.1 Purpose
8.2 System Design
SAV Processing
TEL Processing
OBI Processing
SEQ Processing
8.3 Data Set of a Pointed Observation
8.4 Data Output of the All-Sky Survey
Standard Products of the ROSAT Data Archive (RDA)
9.1 Product Overview
9.2 REV0 Data in the RDA
9.3 REV1 Data in the RDA
9.4 REV2 Data in the RDA
Mission History
A.1 General Spacecraft and Instrument Status
ROSAT Status Reports
World-Wide Web
ROSAT Newsletters
Memos
A.2 Important Dates
Known Problems and Bugs
Spatial
Ghost Images
Aspect Reconstruction and Attitude Errors
Exposure Map
Roll Angle
High Voltage
B.2 Spectral
B.3 PSPC Timing Problems
B.4 HRI Timing Problems
HRI Timing Summary
B.5 Warning: Unresolved Problems
Calibration-related Memos and Publications
Assessment of Efforts to Improve the Attitude Solution
D.1 System Specification
D.2 Assessment
D.3 Performed Investigations
D.4 Prospect
Summary of ROSAT On-line Databases
E.1 On-Line Services at the German RSDC
Information Services
ROSAT Data Archive (RDA)
Interactive Access (BROWSE)
E.2 On-Line Services at GSFC
HEASARC Services
The ROSAT Anonymous FTP Account
Mission Information and Planning System (MIPS)
E.3 On-Line Services at the UK ROSAT Data Archive Centre (UKRDAC)
Information Services
ROSAT Data Archive
E.4 On-Line Services at the German XUV Data Center
Information Services
Archived Data
Calibration Files for Standard Data Processing
F.1 Bin of Aluminum K line (BAL)
F.2 Correction for ADC Non-linearities (NLC)
F.3 Gain Saturation Correction (GSC)
F.4 Temporal Gain Correction (TGC)
F.5 Electronic Position Correction (EPC)
F.6 Correction of Spatial Gain Variations (SGC)
F.7 Window Correction (WC)
F.8 Correction for XRT Field Distortion (FC)
F.9 Comments of the PSPC Corrections
Input Files for Standard Source Analysis
G.1 Files for Calibrating Absolute Photon Flux
G.2 Files Containing Spectral Models
G.3 Probability Tables
References
Index
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