OGIP Calibration Memo CAL/EXO/92-018

EXOSAT
CALIBRATION FILES
IN THE OGIP CALDB

EXOSAT CALIBRATION FILES IN THE OGIP CALDB






edited by:
http://legacy.gsfc.nasa.gov/docs/bios/imgeorge.html & Ron S Zellar
HEASARC
Codes 664 & 668,
NASA/GSFC,
Greenbelt, MD20771
Last Update: 1995 Feb 24
(by IMG)





SUMMARY

The calibration datasets currently in the OGIP caldb related to EXOSAT are described.
Intended audience: General users, OGIP programmers and authors of data analysis s/w.

LOG OF SIGNIFICANT CHANGES


Release Sections Changed Brief Notes
Date
1995 Feb 24 All Made compatible with LaTeX2HTML software

Chapter 1
INTRODUCTION

1.1  Overview

This document is intended to provide a notes on the origin, format, limitations etc of all EXOSAT calibration datasets within the http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/caldb_intro.html.
In the rest of this chapter, the location and structure of the http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/caldb_intro.html at http://www.gsfc.nasa.gov/GSFC_homepage.html at is briefly described, along with references to other relevant documentation.
All EXOSAT LE, CMA, ME, TGS & GSPC datasets within the caldb at NASA/GSFC are then summarized in Chapters  through , with non-instrument specific datasets summarized in Chapter .

1.2  The OGIP Caldb at NASA/GSFC

The location, organization and contents of the http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/caldb_intro.html on-line at NASA/GSFC is summarized in OGIP Calibration Memo CAL/GEN/93-006 (available on-line as ftp://legacy.gsfc.nasa.gov/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.ps and http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.html versions).

1.2.1  Location

The http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/caldb_intro.html is physically located on the (ultrix) legacy machine within the http://heasarc.gsfc.nasa.gov/docs/lhea/homepg_lhea.html at http://www.gsfc.nasa.gov/GSFC_homepage.html within the caldb directory tree. The entire caldb directory tree is available to remote users via ftp://legacy.gsfc.nasa.gov/caldb or gopher://legacy.gsfc.nasa.gov/11/caldb Within the OGIP, the caldb has been remote mounted on all other machines and the symbolic links /caldb & /CALDB created to point to the above top level directory. An identical copy of the caldb is also available on the (VMS) LHEA vax cluster at NASA/GSFC (see CAL/GEN/93-006, available on-line as ftp://legacy.gsfc.nasa.gov/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.ps and http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.html versions).

1.2.2  Basic Structure

The contents of the /caldb area is sub-divided between the following sub-directory trees: Here we only consider the data tree. It should be noted that access to certain caldb directory trees is also available from other areas of the legacy anonymous ftp account via symbolic links (see CAL/GEN/93-006, available on-line as ftp://legacy.gsfc.nasa.gov/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.ps and http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_93_006/cal_gen_93_006.html versions).

1.2.3  Calibration Data File Classes

The OGIP caldb classifies files as `Primary Calibration Files' `Basic Calibration Files' and `Calibration Product Files' (PCFs, BCFs & CPFs respectively; see also CAL/GEN/91-001, available on-line as ftp://legacy.gsfc.nasa.gov/caldb/docs/memos/cal_gen_91_001/cal_gen_91_001.ps and http://legacy.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_91_001/cal_gen_91_001.html versions). PCFs are 'raw' ground and in-orbit calibration datasets not of immediate interest to most users as they are not directly required for (all but the most specialized) scientific data analysis tasks. These dataset are not considered here. BCFs contain the lowest level calibration datasets potentially required by downstrem software, and can be considered the `atomic units' of the instrument calibration. CPFs contain `convolutions' of the information stored within BCFs customized for a specific analysis task and/or scientific observation.
All BCF & CPF calibration files are organized using the scheme
/caldb/data/mission/inst
where mission & inst are the OGIP-standard names for the mission and instrument. For internal management purposes, a further division into inst/bcf and inst/cpf sub-directories is made in most cases. Non-instrument specific calibration datasets, including general spacecraft housekeeping information etc, can be found in the /caldb/data/mission/mis sub-directory.

1.3  Conventions used within this Document

Throughout this document, the hash (#) symbol is used as a wild-card in filenames to indicate several files are available with slightly different names. In all cases the detailed naming scheme, along with the characters which can be used to replace the # are described in the detailed description of the file set.

1.4  Acknowledgments

The information within this document obviously could not have been compiled without the help of very many people associated with the EXOSAT project, to whom we owe an enormous debt. Wherever possible we acknowledge the direct source of the information within the text, but undoubtedly this may often under-represent the collective effort involved. We apologise to anybody who has inadvertently not been credited, and will be happy to add their name in the appropriate place(s).

Chapter 2
EXOSAT LE CALIBRATION FILES

2.1  Summary of Available Files

The LE calibration files available under the
/caldb/data/exosat/le/type
directory tree are listed in Table . In many cases the actually files will be stored in sub-directories under this tree, as detailed in the corresponding detailed description.
Table 2.1: Summary of EXOSAT LE (XRT) calibration files available within the OGIP Caldb

Filename Description Section
Basic Calibration Files (type = bcf)
None
Calibration Product Files (type = cpf)
None










































Chapter 3
EXOSAT CMA CALIBRATION FILES

3.1  Summary of Available Files

The EXOSAT CMA calibration files available under the
/caldb/data/exosat/cma/type
directory tree are listed in Table . In many cases the actually files will be stored in sub-directories under this tree, as detailed in the corresponding detailed description.
Table 3.1: Summary of EXOSAT CMA calibration files available within the OGIP Caldb

Filename Description Section
Basic Calibration Files (type = bcf)
None
Calibration Product Files (type = cpf)
cma#c.rsp Series of response matrices for CMA/filter combinations










































3.2  CPF: CMA Detector Redistribution Matrices

3.2.1  cma#c.rsp

Location

ftp://legacy.gsfc.nasa.gov/caldb/data/exosat/cma/cpf
Summary of File

On-axis spectral response matrices are available (cmanXXXc.rsp) for both CMA detectors (CMA-1 & CMA-2, denoted by n=1,2 respectively in the file-naming scheme) in combination with all scientific filters. The filter in use is also reflected in the filename via XXX, where: XXX = ¯ alp     ¯ for the aluminum-parylene (AlP) filter         ¯(FW.pos 6)
 bor  for the boron filter  (FW.pos 8)
 lx3  for the thin (300 nm) Lexan (3Lx) filter  (FW.pos 7)
 lx4  for the thick (400 nm) Lexan (4Lx) filter  (FW.pos 7)
 ppl  for the polypropylene (PPL) filter  (FW.pos 2)
Delivered to HEASARC by:

Old-style SF files were copied from the appropriate area under XANADU, and converted to OGIP FITS 1993 Oct 11 by Ian M George (HEASARC).
File Format

RMFVERSN = 1992a
Input Datasets, Assumptions, etc

No information supplied to the CALDB
Points to Note

Chapter 4
EXOSAT ME CALIBRATION FILES

4.1  Summary of Available Files

The EXOSAT ME calibration files available under the
/caldb/data/exosat/me/type
directory tree are listed in Table . In many cases the actually files will be stored in sub-directories under this tree, as detailed in the corresponding detailed description.
Table 4.1: Summary of EXOSAT ME calibration files available within the OGIP Caldb

Filename Description Section
Basic Calibration Files (type = bcf)
None
Calibration Product Files (type = cpf)
None










































Chapter 5
EXOSAT GSPC CALIBRATION FILES

5.1  Summary of Available Files

The EXOSAT GSPC calibration files available under the
/caldb/data/exosat/gspc/type
directory tree are listed in Table . In many cases the actually files will be stored in sub-directories under this tree, as detailed in the corresponding detailed description.
Table 5.1: Summary of EXOSAT GSPC calibration files available within the OGIP Caldb

Filename Description Section
Basic Calibration Files (type = bcf)
None
Calibration Product Files (type = cpf)
None










































Chapter 6
EXOSAT MISCELLANEOUS CALIBRATION FILES

6.1  Summary of Available Files

The miscellaneous non-instrument specific & s/c-related calibration files available under the
/caldb/data/exosat/mis/type
directory tree are listed in Table . In many cases the actually files will be stored in sub-directories under this tree, as detailed in the corresponding detailed description.
Table 6.1: Summary of EXOSAT MIS calibration files available within the OGIP Caldb

Filename Description Section
Basic Calibration Files (type = bcf)
None
Calibration Product Files (type = cpf)
None










































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