OGIP Calibration Memo CAL/GEN/92-002a
The Calibration Requirements for Spectral Analysis
Ian M George,
&
Keith A Arnaud,
Addendum: Changes log
Mail Code 662,
NASA/GSFC,
Greenbelt,
MD20771.
Version: 1998 Dec 21
|
Release | Sections Changed | Brief Notes |
Date | ||
1993 Dec 02 | Original Version | |
1995 Jan 11 | All | Made compatible with LaTeX2HTML s/w |
1998 Dec 21 | All | Use of HDUVERS and update of RSP_MATRIX format |
2004 Apr 1 | All | made compatible with tth |
The memo CAL/GEN/92-002 (George et al. 1992, available on-line as
pdf
and
html
versions)
described the general
calibration requirements for spectral analysis, and gave formats for
the so-called redistribution matrix file (RMF) and ancillary response file
(ARF).
The RMF consisted of
a FITS file with a 'null' primary array and the following BINTABLE extensions:
The memo then gave the detailed format of each of these extension.
Since the adoption of the format originally given in George et al, a
number of conventions/rules have been introduced within the
OGIP
to help
clarify & unify a multi-mission, multi-application approach to the design
of FITS files. Specifically, the
OGIP FITS Working Group (OFWG)
was
created and started making recommendations. Many of the changes which have
been made to the format of the spectrum extension reflect such rulings of
the
OFWG.
In this addendum we list all such format changes along with the
corresponding values of the HDUVERS keyword.
A summary of the changes which have been made to the format originally
given in
CAL/GEN/92-002 (George et al. 1992, available on-line as
pdf
and
html
versions) is listed in
Table 1
1 INTRODUCTION
The ARF consisted of
a FITS file with a 'null' primary array and a single
SPECRESP extension.
2 CHANGES TO THE RSP_MATRIX EXTENSION OF THE RMF
HDUVERS | Date | XSPEC | Comments |
version | |||
1.0.0 | 1992 Oct | > 8.0 | Original George etal format |
1.1.0 | 1993 Sep | > 8.0 | Additional (optional) keywords suggested |
1.2.0 | 1996 Oct | > 9.0 | Added TLMIN keyword for F_CHAN column |
1.3.0 | 1998 Dec | > 10.1 | Use HDUVERS. Additional optional keywords |
and optional ORDER column | |||
This format, also commonly known as 'RMFVERSN=1992a', was described in the original version of the memo CAL/GEN/92-002 published in Legacy (George etal 1992). It was superseded by the HDUVERS2 = 1.1.0 format.
This format added the additional optional (although recommended) keywords :
This format added the mandatory TLMIN keyword for the F_CHAN column. The keyword specified the first channel used in the response matrix (usually either 0 or 1). This was superseded by the HDUVERS = 1.3.0 format.
This format replaced the HDUVERS1 and HDUVERS2 keywords by the single HDUVERS keyword. It is recommended that HDUVERS1 and HDUVERS2 are retained but with comments noting that they are obsolete and only included for the benefit of older software. The keywords HDUCLASS, HDUCLAS1, HDUCLAS2, and HDUVERS are now mandatory. RMFVERSN is no longer required.
Two new optional, but recommended, keywords have been added to the format.
A new column may be added for responses of grating instruments.
A summary of the changes which have been made to the format originally given in CAL/GEN/92-002 (available on-line as pdf and html versions) is listed in Table 2.
HDUVERS | Date | XSPEC | Comments |
version | |||
1.0.0 | 1992 Oct | > 8.0 | Original George etal format |
1.1.0 | 1993 Sep | > 8.0 | Additional (optional) keywords suggested |
1.2.0 | 1996 Oct | > 9.0 | Added TLMIN keyword for CHANNEL column |
1998 Dec | > 10.1 | Using HDUVERS | |
This format, also commonly known as 'RMFVERSN=1992a', was described in the original version of the memo CAL/GEN/92-002 published in Legacy (George etal 1992). It was superseded by the HDUVERS2 = 1.1.0 format.
This format added the additional optional (although recommended) keywords :
This format added the mandatory TLMIN keyword to the CHANNEL column. The keyword specified the first channel used in the response matrix (usually either 0 or 1). The HDUVERS keyword has replaced HDUVERS1 and HDUVERS2. It is recommended that HDUVERS1 and HDUVERS2 are retained but with comments noting that they are obsolete and only included for the benefit of older software. The keywords HDUCLASS, HDUCLAS1, HDUCLAS2, and HDUVERS are now mandatory. RMFVERSN is no longer required.
A summary of the changes which have been made to the format originally given in CAL/GEN/92-002 (available on-line as pdf and html versions) is listed in Table 3.
HDUVERS | Date | XSPEC | Comments |
version | |||
1.0.0 | 1992 Oct | > 8.0 | Original George etal format |
1.1.0 | 1993 Sep | > 8.0 | Additional (optional) keywords suggested |
1998 Dec | > 10.1 | Using HDUVERS | |
This format, also commonly known as 'ARFVERSN=1992a', was described in the original version of the memo CAL/GEN/92-002 published in Legacy (George etal 1992). It was superseded by the HDUVERS2 = 1.1.0 format.
The HDUVERS keyword has replaced HDUVERS1 and HDUVERS2. It is recommended that HDUVERS1 and HDUVERS2 are retained but with comments noting that they are obsolete and only included for the benefit of older software. ARFVERSN is no longer required.
The following keywords are now mandatory :
George, I.M, Arnaud, K.A, Pence, W. & Ruamsuwan, L.,
1992. Legacy, 2, 51.
(CAL/GEN/92-002, available on-line as
pdf
and
html
versions).
The following useful links are available (in the HTML version of this document only):