GHRS Instrument Science Report 067, Official Update #1, Draft1
Calibration Product Review for the GHRS
Lisa E. Sherbert and S. J. Hulbert
This Report summarizes the status of calibrations and calibration
reference files for the Goddard High Resolution Spectrograph. Each
calibration file that is stored in the Calibration Database System (CDBS) is
briefly described as well.
1. Introduction
The pipeline data reduction program, calhrs, determines how to calibrate a particular dataset by
checking “switches” that are set to PERFORM or OMIT and by accessing various calibration reference files.
These reference files were summarized in GHRS-ISR-067 Calibration Product Review for the GHRS in
Early Cycle 4, by Hulbert, et al., but due to changes in calibration, this document needs to be continually
updated. Up until now, we have been providing updates via the GHRS Calibration Resource pages on the
World Wide Web. This is the latest version of that document, dated 06 Jun 1997, and it will be available on
only on the WWW, initially.
This document contains a listing of all GHRS Reference Images and Tables that are presently available in
the Calibration Data Base System (CDBS). The tables herein are intended to provide a history of the
differences among the files and tables which were used by the pipeline to calibrate GHRS data. This
Report provides a description of the files and their usage as of 06 June 1997, for the convenience of
Archival HST users. A brief review of the calibration process and control switches is included here.
Additional information on the usage of calhrs and the reference files may be found in HST Data
Handbook, issued in December, 1995 and later.
2. Calibration Process
Figure 1 shows a flowchart of the calibration process followed by calhrs. In this diagram, the rectangles
on the right-hand side contain the name of a calibration switch that “controls” a given calibration step. The
performed calibration step is briefly described in the central rectangular box. The rounded boxes on the left
contain the names of calibration reference files needed for a particular calibration step to be completed.
Figure 2 is an example science data header, listing the header keywords that act as calibration “switches”
as well as the list of calibration reference files used.
1. Copies of this report may be obtained from the Science Instruments Branch, Space Telescope Science
Institute, 3700 San Martin Drive, Baltimore MD 21218.
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 1
Figure 1: Calibration Flowchart
Input
Files
Calibration
Steps
Raw Science Images
(.d0h, .x0h, .shh, .ulh,
.q0h, .xqh)
DQIHFILE, CCRD
DIOHFILE
Switches
Compute Exposure Times
Data Quality Initialization
DQI_CORR
Convert to Count Rate
EXP_CORR
Diode Response Correction
DIO_CORR
Paired Pulse Correction
PPC_CORR
Mapping Function
MAP_CORR
Compute Doppler Correction
DOP_CORR
PHCHFILE
Remove Photocathode Granularity
PHC_CORR
VIGHFILE
Remove Vignetting
VIG_CORR
Merge Data
MER_CORR
Apply Dispersion Coefficients
ADC_CORR
CCG2
CCR1, CCR2
CCR5, CCR6, CCR7
Output Files
Continued on Next Page
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 2
Figure 2: Calibration Flowchart (Continued) t
Input
Files
Calibration
Steps
Switches
Output Files
Continued from Previous Page
Subtract Background*
BCK_CORR
Mean Filter Background Removal
MNF_CORR
Median Filter Background Removal
MDF_CORR
CCR3, CCRB
Polynomial Fitting Bkgnd. Removal
PLY_CORR
SAAHFILE, CCRE
Model Background Removal
BMD_CORR
CCR8
Incidence Angle Correction
IAC_CORR
CCR9, CCRA
Echelle Ripple Correction
ECH_CORR
ABSHFILE, NETHFILE
Convert to Absolute Flux Units
CCR3
CCR3
FLX_CORR
Apply Heliocentric Correction
HEL_CORR
Vacuum to Air Correction
VAC_CORR
.c0h, .c1h, .c2h,
.c3h, .c4h, .c5h*, .cqh
* .c5h is only generated if BCK_CORR=PERFORM
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 3
Figure 3: Example Science Data Header File Showing Calibration Reference Files and Switches
/ CALIBRATION REFERENCE FILES
DIOHFILE=
‘zref$cce1504az.r0h’
PHCHFILE=
‘zref$bcc11275z.r1h’
VIGHFILE=
‘zref$e751116dz.r2h’
ABSHFILE=
‘zref$e5v0936rz.r3h’
NETHFILE=
‘zref$e5v0936az.r4h’
DQIHFILE=
‘zref$cce1505kz.r5h’
SAAHFILE=
‘zref$h5m1337dz.r6h’
CCR1
=
‘ztab$aau13518z.cz1’
CCR2
=
‘ztab$ba412190z.cz2’
CCR3
=
‘ztab$c7f1130oz.cz3’
CCR4
=
‘ztab$a3d1045dz.cz4’
CCR5
=
‘ztab$e3u1417oz.cz5’
CCR6
=
‘ztab$e3t1251bz.cz6’
CCR7
=
‘ztab$e3t1250tz.cz7’
CCR8
=
‘ztab$e3t1250lz.cz8’
CCR9
=
‘ztab$e751042hz.cz9’
CCRA
=
‘ztab$e751041qz.cza’
CCRB
=
‘ztab$d8b1457az.czb’
CCRC
=
‘ztab$e3u14301z.czc’
CCRD
=
‘ztab$e3t1028nz.czd’
CCRE
=
‘ztab$h5m13378z.cze’
CCG2
=
‘mtab$a3d1145ly.cmg’
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
diode response header file
photocathode response header file
vignetting response header file
absolute flux header file
absolute flux wavelength net header file
data quality initialization header file
SAA Contour Mask header file
photocathode line mapping parameters table
photocathode sample parameters table
detector parameters table
wavelength ranges table
spectral order constants table
dispersion constants table
thermal constants table
incidence angle coefficients table
echelle interpolation constants table
echelle non-interpolation constants table
scattered light correction factors
global wavelength coefficients table
photocathode blemish table
background count rate model
paired-pulse correction table
/ CALIBRATION SWITCHES
DQI_CORR=
‘PERFORM
EXP_CORR=
‘PERFORM
DIO_CORR=
‘PERFORM
PPC_CORR=
‘PERFORM
MAP_CORR=
‘PERFORM
DOP_CORR=
‘OMIT
PHC_CORR=
‘PERFORM
VIG_CORR=
‘PERFORM
MER_CORR=
‘PERFORM
GWC_CORR=
‘PERFORM
ADC_CORR=
‘PERFORM
MDF_CORR=
‘OMIT
MNF_CORR=
‘OMIT
PLY_CORR=
‘PERFORM
BMD_CORR=
‘OMIT
BCK_CORR=
‘PERFORM
IAC_CORR=
‘PERFORM
ECH_CORR=
‘PERFORM
FLX_CORR=
‘PERFORM
HEL_CORR=
‘PERFORM
VAC_CORR=
‘OMIT
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
data quality initialization
division by exposure time
diode response correction
paired-pulse correction
mapping function
doppler compensation
removal of photocathode nonuniformity
removal of vignetting nonuniformity
merging of substep bins
use global wavelength coefficients
application of dispersion constants
median filter of background spectra
mean filter of background spectra
polynomial smoothing of background spectra
background model INSTEAD of bkgd spectra
background removal
incidence angle correction
correction for echelle ripple
absolute flux calibration
conversion to heliocentric wavelengths
vacuum to air correction
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
‘
3. Summary of Reference Files
Table 1 lists the 7 types of GHRS reference images and 15 types of GHRS reference tables contained in
CDBS as well as 2 reference tables used for post-pipeline processing. Table 1 is organized by file format,
the filename extension used to identify a given type of reference image or table, the name of the header
keyword in the science data header that contains the actual name of the reference image or table used by
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 4
the calibration software to calibrate the data, a short description of the reference image or table, and, where
appropriate, the selection criterion used to differentiate among reference files of the same type.
4. File Descriptions
The summaries found in Tables 2 through 24 are grouped by the DESCRIPTION column in Table 1. Each
existing reference image has listed the detector or grating for which this file is appropriate—reference
tables are not differentiated in this manner since they contain data appropriate for all gratings or detectors.
The date of its installation into CDBS, the USE_AFTER date, the source of the data (PEDIGREE), and a
short description of why the file was updated is also given. The USE_AFTER date is an important feature
of CDBS. This keyword allows for the proper time-tagging of reference files and tables. A given file or
table with a particular USE_AFTER date should only be used to process data obtained on or after the
USE_AFTER date—hence, the name. The PEDIGREE of a reference file or table indicates the source of
the data. The permitted values for this parameter are:
GROUND means that pre-launch measurements were used to generate the reference data;
INFLIGHT means that measurements were collected with GHRS in orbit; and,
MODEL means that the data are based on a model instead of measurements;
DUMMY means that there is no reference data, instead the file or table contains all 1’s or
0’s and has no effect on calibration.
For internal tracking purposes we are now including from the CDBS-PODPS tracking forms, the initials of
those persons who (submitted/verified/approved) the data. The slashes separate the different steps in the
process of getting the data into the CDBS; information which is unavailable will be left blank. A list of full
names corresponding to the initials used is available below:
Personnel
Initials
Person/Organization
Initials
Person
IDT
Instrument Definition Team
PL
Paul Lee
MdlP
Michele de la Peña
HG
Harry Garner
JDE
Jonathan Eisenhamer
DL
Don Lindler
LF
Laura Ferrarese
CL
Claus Leitherer
RLG
Ron Gilliland
MM
Melissa McGrath
AMG
Anne Gonnella
ABS
Al Schultz
SJH
Steve Hulbert
LES/MEW
Lisa E. Sherbert
ML
Matt Lallo
DRS
Dave Soderblom
HL
Howard Lanning
CT
Calvin Tullos
4.1 Selecting the “Right” Images and Tables
Over the past several years a number of changes have been made to both the reference images and tables
and the calibration software that employs them. In general, software changes are backwards-compatible
with earlier versions of reference tables. However, this has not always been the case. Consequently, the
current version of the software will not properly run with “old” data and/or “old” reference files. This is
most likely to be a problem if one is using data from before 11 Nov 91 in its original form. The simplest
work-around to any problem of this sort is to obtain officially processed data and the latest (appropriate)
reference files and tables from the HST data archive. There are two methods by which one can identify the
“best” reference files and tables to use when recalibrating GHRS data. 1) Use this document and compare
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 5
it to your headers by hand. 2) Use the HST Data archive —the GHRS calibration file form in StarView
provides a simple interface for identifying the “best” files.
Table 1: List of GHRS Reference Files and Tables in CDBS
File
Format
Filename
Extension
Header
Keyword
Description
Selection
Criterion
Files
r0h
DIOHFILE
GHRS diode response files
Detector
r1h
PHCHFILE
GHRS photocathode response files
Grating
r2h
VIGHFILE
GHRS vignetting files
Grating
r3h
ABSHFILE
GHRS absolute sensitivity files
Grating
r4h
NETHFILE
GHRS wavelength net files
Grating
r5h
DQIHFILE
GHRS data quality files
Detector
r6h
SAAHFILE
SAA Contour Mask header file
n/a
cz1
CCR1
GHRS line mapping parameters
n/a
cz2
CCR2
GHRS sample mapping parameters
cz3
CCR3
GHRS detector parameters
cz4
CCR4
GHRS wavelength ranges
cz5
CCR5
GHRS spectral order constants
cz6
CCR6
GHRS dispersion constants
cz7
CCR7
GHRS thermal constants
cz8
CCR8
GHRS incidence angle constants
cz9
CCR9
GHRS echelle ripple interpolation constants
cza
CCRA
GHRS echelle ripple non-interpolation constants
czb
CCRB
GHRS scale factors for scattered light subtraction
czc
CCRC
GHRS Global Wavelength Coefficients
czd
CCRD
GHRS Photocathode Blemish Location Table
cze
CCRE
GHRS Background Count Rate Model
cmg
CCG2
Paired-pulse correction table
czy
Not used for
pipeline processing
PtNe Lamp Line List
Tables
Tables
czz
SSA Wavelength Offsets
n/a
5. Individual Reference Files
5.1 Diode Response Files (DIOHFILE).
The diodes within the Digicons of the GHRS do not have identical sensitivities. The diode response
correction (controlled by DIO_CORR) divides the input data by diode response values (which are near
unity). Applying a correction to the observed count rates is normally done in all cases. This file has
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 6
changed with time because of threshold adjustment in a few diodes. Each detector has 512 diodes, the
middle 500 of which are used for science.
Table 2: GHRS Diode Response Files
FILE
DET
DATE
USE_AFTER
PEDIGREE
COMMENT
20 Dec 89
24 Apr 90
GROUND
Initial delivery from IDT.
(DL/ML/RLG)
19 Oct 90
24 Apr 90
INFLIGHT
OV Data from IDT.
(RLG//RLG)
8ck15001z.r0h
1
8ck15002z.r0h
2
aaj0926dz.r0h
1
aaj0926oz.r0h
2
c551543az.r0h
2
07 May 92
20 Apr 92
INFLIGHT
Thresholds adjusted for science
diodes 80, 237, 273, and 441 (86,
243, 279, 447 out of 512) by STScI
based on discussions w/HG.
(SJH/MEW/MEW)
cce1504az.r0h
2
15 Dec 92
21 Dec 92
INFLIGHT
Set science diode 342 (348 out of
512) response to 0: turned off as of
92356 PHA test (PID 2851); based
on discussions w/HG.
(SJH/MEW/MEW)
f511531az.r0h
2
12 Apr 95
15 May 95
INFLIGHT
Science diode 237 (243/512)
turned off as of 95135.
(LES/AG)
f5o1134cz.r0h
1
22 May 95
29 May 95
INFLIGHT
Science diode 085 (091/512)
turned off as of 95149.
(AG/LES)
g2e08350z
2
26 Feb 96
26 Feb 96
INFLIGHT
Science diode 051 (057/512)
turned off as of 96057.
(LES/DRS)
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GHRS Instrument Science Report 067, Official Update #1, Draft
Page 7
5.2 Photocathode Response Files (PHCHFILE).
The photocathode response correction (controlled by PHC_CORR) is included to allow for the removal of
the granularity of the GHRS photocathodes to achieve high signal-to-noise. Presently, however, the GHRS
does not use this feature because obtaining the flat-field exposures for all possible grating positions is
impracticable for most gratings. Therefore the default pipeline image is a DUMMY file that is populated with
ones and zeroes and the only changes made to the default since launch have been to correct mistakes and
keep grating names up to date. However, in 1996, G140L flat filed files became available. Please see
GHRS-ISR-076 for more details.
Table 3: GHRS Photocathode Response Files
FILE
GRATING
DATE
USE_AFTER
PEDIGREE
COMMENT
96t0914qz.r1h
ECH-A
20 Dec 89
24 Apr 90
DUMMY
96t0916lz.r1h
G140L
96t0915gz.r1h
G140M
Initial Delivery from IDT.
WARNING: these files contain incorrect values in pixel
300.
(DL/ML/RLG)
96t09157z.r1h
ECH-B
96t0915qz.r1h
G160M
96t09167z.r1h
G200M
96t0916ez.r1h
G270M
aa916392z.r1h
ECH-A
10 Oct 90
24 Apr 90
DUMMY
aa91640lz.r1h
G140L
aa91639jz.r1h
G140M
NOTE: incorrect values in
previous files have been corrected.
(RLG//RLG)
aa91639cz.r1h
ECH-B
aa91639qz.r1h
G160M
aa916401z.r1h
G200M
aa91640az.r1h
G270M
bcc1126sz.r1h
ECH-A
12 Dec 91
24 Apr 90
DUMMY
bcc1127bz.r1h
G140L
Same data. New grating
names.
(CT//RLG)
bcc11273z.r1h
G140M
bcc11270z.r1h
ECH-B
bcc11275z.r1h
G160M
bcc11277z.r1h
G200M
bcc11279z.r1h
G270M
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GHRS Instrument Science Report 067, Official Update #1, Draft
Page 8
Table 3: GHRS Photocathode Response Files (Continued)
FILE
GRATING
fbk1610nz.r1h
ECH-A
fbk1610oz.r1h
ECH-B
fbk1610pz.r1h
G140M
fbk1610rz.r1h
G160M
fbk1610sz.r1h
G200M
fbk1610tz.r1h
G270M
fbk16110z.r1h
G140L
ga41342hz.r1h
G140L
LSA
ga41342iz.r1h
G140L
SSA
h3e1400fz.r1h
G140L
LSA
h3e1400gz.r1h
G140L
SSA
DATE
USE_AFTER
PEDIGREE
COMMENT
29 Nov 95
24 Apr 90
DUMMY
Updated to add PEDIGREE
and DESCRIP keywords to
alert user to DUMMY nature
of these files.
(LES//LES)
04 Oct 96
04 Feb 94
INFLIGHT
Post-COSTAR flatfields. For
optional use with S/N>30
data. Use with CALHRS
v.5.10 or higher. Not intended
for pipeline. See GHRS-ISR076.
(ABS//ABS)
03 Apr 97
04 Feb 94
INFLIGHT
Fixes previous 2 files by
removing the INDEFs in first
and last points (which put
zeros in end-points of calibrated data.)
(ABS//LES)
5.3 “Vignetting” (VIGHFILE).
The response of the GHRS photocathode drops near its edges, producing an effect similar to optical
vignetting, hence the name. This effect is calibrated by comparing similar spectra obtained at the center
and edges of the photocathode. Setting VIG_CORR to PERFORM will correct for this phenomena.
Table 4: GHRS Vignetting Files
FILE
GRATING
DATE
USE_AFTER
PEDIGREE
COMMENT
8cl0946rz.r2h
ECH-A
20 Dec 89
24 Apr 90
DUMMY
Initial delivery from IDT.
(DL/ML/RLG)
8cl0948hz.r2h
G140L
8cl0947pz.r2h
G140M
8cl0947hz.r2h
ECH-B
8cl09484z.r2h
G160M
8cl09489z.r2h
G200M
8cl0948dz.r2h
G270M
b9i1428qz.r2h
G140L
02 Oct 91
24 Apr 90
INFLIGHT
b9i14289z.r2h
G140M
SV data from IDT. New grating names.
(DL//RLG)
b9i1428ez.r2h
G160M
b9i1428hz.r2h
G200M
b9i1428mz.r2h
G270M
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GHRS Instrument Science Report 067, Official Update #1, Draft
Page 9
Table 4: GHRS Vignetting Files (Continued)
FILE
GRATING
DATE
USE_AFTER
PEDIGREE
COMMENT
bcc1126oz.r2h
ECH-A
12 Dec 91
24 Apr 90
DUMMY
New Grating names.
(CT//CT)
bcc1126qz.r2h
ECH-B
d9u0950mz.r2h
G160M
30 Sep 93
24 Apr 90
INFLIGHT
Deleted 1st 2 groups from
previous version because
they lead to bad calibration.
The groups deleted correspond to the short wavelength
end of G160M.
(SJH//LES)
e3t1323gz.r2h
ECH-B
29 Mar 94
24 Apr 90
INFLIGHT
Post-SV data from IDT.
(LES//SJH)
e751116az.r2h
ECH-A
05 Jul 94
4 Feb 94
INFLIGHT
Post-COSTAR data from IDT.
(CL/PL/SJH)
e751116cz.r2h
ECH-B
e751116dz.r2h
G160M
e751116ez.r2h
G270M
e751116fz.r2h
G140L
ebe1353oz.r2h
G200M
18 Nov 94
4 Feb 94
INFLIGHT
ebe1353pz.r2h
ECH-A
ebe1353qz.r2h
G140L
Post-COSTAR SSA vignetting for use with CALHRS
v1.3.7, from IDT.
(SJH/SJH/LES)
ebe1353rz.r2h
G160M
ebe1353tz.r2h
G270M
fc11607fz.r2h
ECH-A
15 Dec 95
4 Feb 94
INFLIGHT
Reordered groups to avoid
IRAF bug which introduced
errors into calibrated data for
certain spectral orders.
Deleted extra group for
line_pos=139.712.
(LES//LES)
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GHRS Instrument Science Report 067, Official Update #1, Draft
Page 10
5.4 Absolute Sensitivity Files (ABSHFILE, NETHFILE).
The FLX_CORR switch controls the flux calibration on GHRS data. Each sensitivity file is associated with
a net wavelength file, NETHFILE. The standard fluxes in the far ultraviolet were changed around the time
COSTAR was installed and are now based on the star G191B2B, FOS high-resolution observations, and
models by Finley. Note that time variable post-COSTAR sensitivities became available after GHRS was
removed from HST during the Second Servicing Mission.
Table 5: GHRS Absolute Sensitivity and Wavelength Net Files
ABSHFILE
GRATING
NETHFILE
DATE
USE-AFTER
PEDIGREE
COMMENT
8cl1032iz.r3h
ECH-A
8cl1122sz.r4h
24 Apr 90
GROUND
8cl1035sz.r3h
G140L
8cl11245z.r4h
20
Dec
89
8cl10342z.r3h
G140M
8cl1123az.r4h
8cl1033dz.r3h
ECH-B
8cl11234z.r4h
8cl1034jz.r3h
G160M
8cl1123hz.r4h
8cl10353z.r3h
G200M
8cl1123pz.r4h
8cl1035gz.r3h
G270M
8cl1123tz.r4h
Initial delivery
from IDT.
(These are missing
from the file list
attached to tracking form; would
assume that these
files were delivered
at the same time as
all the other initial
deliveries and that
the same persons
(DL/ML/RLG)
were involved)
b9i1427bz.r3h
ECH-A
b9i14291z.r4h
24 Apr 90
INFLIGHT
b9i14285z.r3h
G140L
b9i14301z.r4h
11
Nov
91
b9i1427jz.r3h
G140M
b9i1429cz.r4h
SV data from IDT.
New grating
names.
(DL//RLG)
b9i1427fz.r3h
ECH-B
b9i14297z.r4h
b9i1427nz.r3h
G160M
b9i1429hz.r4h
b9i1427rz.r3h
G200M
b9i1429lz.r4h
b9i14281z.r3h
G270M
b9i1429qz.r4h
e4e13583z.r3h
ECH-B
04 Feb 94
INFLIGHT
e4e13582z.r3h
G270M
14
Apr
94
e4e13581z.r3h
G200M
Interim post-COSTAR sensitivities
for Side 2.
(SJH//)
e4e13580z.r3h
G160M
e5v0936nz.r3h
ech-a
e5v09367z.r4h
04 Feb 94
INFLIGHT
e5v0936oz.r3h
ech-b
e5v09368z.r4h
31
May
94
e5v0936qz.r3h
g140m
e5v09369z.r4h
e5v0936rz.r3h
g160m
e5v0936az.r4h
e5v0936sz.r3h
g200m
e5v0936bz.r4h
e5v0936tz.r3h
g270m
e5v0936cz.r4h
e5v09370z.r3h
g140l
e5v0936ez.r4h
Post-COSTAR
sensitivities for all
gratings. NOTE:
UV fluxes corrected for updated
standard,
G191B2B. Based
on FOS high dispersion observations and Finley
models*1.005 for
G191B2B only.
(CL/PL/SJH)
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GHRS Instrument Science Report 067, Official Update #1, Draft
Page 11
Table 5: GHRS Absolute Sensitivity and Wavelength Net Files (Continued)
ABSHFILE
GRATING
NETHFILE
DATE
USE-AFTER
PEDIGREE
COMMENT
h4s1130pz.r3h
g140l
h4s1130qz.r4h
29
Apr
97
04 Feb 94
INFLIGHT
New, Improved
G140L baseline
post-COSTAR sensitivity calibration. See GHRSISR-085.
(LES//LES)
h4s1135ez.r3h
g140l
h4s1130qz.r4h
29
Apr
97
14 Jun 94
INFLIGHT
New time-variable
G140L post-COSTAR sensitivities.
Wavelength coverage is incomplete
in these files.
(LES//LES)
INFLIGHT
Time-variable
G140L post-COSTAR sensitivities.
Same as above
except wavelength
coverage is now
complete in these
files.
(LES//LES)
h4s1135fz.r3h
01 Aug 94
h4s1135gz.r3h
21 Oct 94
h4s1135hz.r3h
14 Jan 95
h4s1135iz.r3h
17 Apr 95
h4s1135jz.r3h
25 Jun 95
h4s1135kz.r3h
17 Sep 95
h4s1135lz.r3h
04 Jan 96
h4s1135mz.r3h
02 Feb 96
h4s1135nz.r3h
30 Aug 96
h4s1135oz.r3h
22 Nov 96
h4s1135pz.r3h
24 Jan 97
h5m10094z.r3h
h5m10095z.r3h
g140l
h4s1130qz.r4h
22
May
97
14 Jun 94
01 Aug 94
h5m10096z.r3h
21 Oct 94
h5m10097z.r3h
14 Jan 95
h5m10098z.r3h
17 Apr 95
h5m10099z.r3h
25 Jun 95
h5m1009az.r3h
17 Sep 95
h5m1009bz.r3h
04 Jan 96
h5m1009cz.r3h
02 Feb 96
h5m1009dz.r3h
30 Aug 96
h5m1009ez.r3h
22 Nov 96
h5m1009fz.r3h
24 Jan 97
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 12
5.5 Data Quality Initialization (DQIHFILE).
This file is used to flag dead diodes in the GHRS Digicons during data quality initialization (DQI_CORR).
The dead diodes are “removed” from the calibrated data during the merging of substep bins (controlled by
the MER_CORR switch).
Table 6: GHRS Data Quality Initialization Files
FILE
DET
DATE
USE_AFTER
PEDIGREE
COMMENT
96t0916rz.r5h
1
20 Dec 89
24 Apr 90
GROUND
Initial delivery from IDT.
(DL/ML/RLG)
96t09174z.r5h
2
c5516031z.r5h
2
07 Mar 92
24 Apr 90
INFLIGHT
Set flag value of dead diodes to
‘400’ to match calibration software.
(SJH/MEW/MEW)
c7u0854mz.r5h
1
31 Jul 92
24 Apr 90
INFLIGHT
Set flag value of dead diodes to
‘400’ to match calibration software.
(SJH/MEW/MEW)
cce1505kz.r5h
2
15 Dec 92
21 Dec 92
INFLIGHT
Science diode 342 (348/512)
turned of as of 92356.
(SJH/MEW/MEW)
f511531iz.r5h
2
12 Apr 95
15 May 95
INFLIGHT
Science diode 237 (243/512)
turned off as of 95135.
(LES/AG)
f5o1134qz.r5h
1
22 May 95
29 May 95
INFLIGHT
Science diode 085 (091/512)
turned off as of 95149.
(AG/LES)
g2e08383z.r5h
2
26 Feb 96
26 Feb 96
INFLIGHT
Science diode 051 (057/512)
turned off as of 96057.
(LES/DRS)
5.6 SAA Contour Mask Header (SAAHFILE)
This file is used by the optional background model correction switch (BMD_CORR), made available with
calhrs v.1.3.11 (Mar 97), as a basis for the shape of the South Atlantic Anomaly (SAA) based on HST
PDB (Project Database) Model 7. The location of HST during the observation is compared to the location
of the SAA Model contour. Warning messages are issued for any readout which is found to encroach upon
the SAA. Background count rate model results are unreliable in this region.
Table 7: GHRS SAA Model
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
h5m1337dz.r6h
22 May 97
24 Apr 90
MODEL
SAA Contour Model 7 from PDB for Model
BKGD (BMD_CORR) correction. See
GHRS-ISR-084. Requires CALHRS
v.1.3.11 or later.
(MdlP//LES)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 13
5.7 Line and Sample Mapping Parameters (CCR1, CCR2).
The mapping parameter tables referred to in the MAP_CORR calibration step contain coefficients that relate
the photocathode coordinate system to the diode array coordinate system. Sample position is measured in
the dispersion direction while line position is measured perpendicular to the dispersion.
Table 8: GHRS Line Mapping Parameters
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d10459z.cz1
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
aau13518z.cz1
06 Nov 90
24 Apr 90
INFLIGHT
OV data from IDT.
(LF//RLG)
Table 9: GHRS Sample Mapping Parameters
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045az.cz2
14 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
aaj11108z.cz2
19 Oct 90
24 Apr 90
INFLIGHT
OV data from IDT.
(RLG//RLG)
ba412190z.cz2
11 Nov 91
24 Apr 90
INFLIGHT
Improved data from IDT; new grating
names.
(DL//RLG)
5.8 Detector Parameters (CCR3).
Among many other things, this table determines how the background measurements are smoothed before
being applied to the observations. The most recent version, dated 15 July 1992, forces the background to
be calculated as a single average value across the spectrum, in order to avoid effects that were caused by
using polynomials or straight lines. Many calibration steps use some subset of parameters from this table.
Table 10: GHRS Detector Parameters
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045bz.cz3
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
bc41634lz.cz3
04 Dec 91
24 Apr 90
INFLIGHT
Values for polynomial background
smoothing added.
(DL//RLG)
c7f1130oz.cz3
15 Jul 92
24 Apr 90
INFLIGHT
Order for polynomial smoothing of background set to zero.
(SJH/MEW/MEW)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 14
5.9 Wavelength Ranges (CCR4).
The wavelength range table contains the valid ranges of wavelength that are applicable to each grating of
the GHRS. This reference table is, in fact, not now used by the calibration software.
Table 11: GHRS Wavelength Ranges
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045dz.cz4
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
NOTE: This reference table is currently not
used by the calibration software.
(DL//RLG)
5.10 Spectrum Constants (CCR5).
In the process of the wavelength calibration, the application of dispersion constants (controlled by switch
ADC_CORR) step makes use of this table to determine which spectrum order was observed, especially
when echelle-mode observations are obtained.
Table 12: GHRS Spectrum Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045fz.cz5
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
bc41510sz.cz5
04 Dec 91
24 Apr 90
GROUND
New grating names.
(MEW//MEW)
e3u1415mz.cz5
30 Mar 94
24 Apr 90
INFLIGHT
Modified to support global dispersion
coefficient algorithm. Added values for all
first order gratings.
(LES//SJH)
e3u1417oz.cz5
30 Mar 94
16 Jan 94
INFLIGHT
Global dispersion coefficient algorithm
constants modified to use Post-Servicing
Mission Side 1 Carrousel positions (which
are based on Side 2 encoder values).
(LES//SJH)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 15
5.11 Dispersion Constants (CCR6).
The determination of a wavelength solution (controlled by the ADC_CORR switch) uses these dispersion
constant values to generate wavelength scales appropriate to the mode of observation This table is indexed
by carrousel position—interpolation in this table is often necessary. This table is used when the global
wavelength solution is not used, i.e. calibration step GWC_CORR is set to OMIT.
Table 13: GHRS Dispersion Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045hz.cz6
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
aau1352az.cz6
30 Oct 90
24 Apr 90
INFLIGHT
OV data from IDT.
WARNING: this table contains incorrect
values for the dispersion coefficients at
certain carrousel positions. (LF//RLG)
ba412199z.cz6
04 Nov 91
24 Apr 90
INFLIGHT
New grating names. Same errors as previous table.
(DL//RLG)
c3v1133gz.cz6
31 Mar 92
24 Apr 90
INFLIGHT
NOTICE: Errors in previous two tables
have been corrected.
(SJH/SJH/SJH)
e3t1251bz.cz6
29 Mar 94
16 Jan 94
INFLIGHT
Side 1 values modified for Post-Servicing
Mission Side 1 Carrousel positions (which
are based on Side 2 encoder values).
(LES//SJH)
5.12 Thermal Constants (CCR7).
Thermal constants are used during the wavelength solution calibration step (ADC_CORR) to correct the
wavelength scales for the effect of temperature within the GHRS.
Table 14: GHRS Thermal Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045iz.cz7
06 Mar 90
24 Apr 90
DUMMY
Initial delivery from IDT.
(DL//RLG)
ba41219bz.cz7
04 Nov 91
24 Apr 90
INFLIGHT
SV data from IDT; new grating names.
(DL//RLG)
e3t1250tz.cz7
29 Mar 94
24 Apr 90
INFLIGHT
Table modified and columns added for
improved global dispersion coefficient
determination. Data provided by IDT.
(LES//SJH)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 16
5.13 Incident Angle Correction, or Aperture Offsets (CCR8).
All GHRS wavelengths are referenced to the SSA. Light enters the LSA and the two spectral calibration
lamp apertures at different angles than for the SSA; a zero-point shift in wavelength is seen. The
IAC_CORR step places non-SSA observations on the same wavelength scale as the SSA.
Table 15: GHRS Incidence Angle Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045jz.cz8
06 Mar 90
24 Apr 90
DUMMY
Initial delivery from IDT.
(DL//RLG)
aau1352fz.cz8
30 Oct 90
24 Apr 90
INFLIGHT
OV data from IDT.
(LF//RLG)
ba41219ez.cz8
04 Oct 91
24 Apr 90
INFLIGHT
SV data from IDT; new grating names.
(DL//RLG)
bb110387z.cz8
01 Nov 91
24 Apr 90
INFLIGHT
SV data from IDT for LSA/ G160M,
G200M, G270M combinations. NOTE:
Some DUMMY data for Side 2 gratings still
included.
(DL//RLG)
e3t1250lz.cz8
29 Mar 94
16 Jan 94
INFLIGHT
Side 1 values modified for Post-Servicing
Mission Side 1 Carrousel positions (which
are based on Side 2 encoder values). NOTE:
DUMMY values in previous table removed.
(LES//SJH)
h2615285z.cz8
18 Feb 97
04 Feb 94
INFLIGHT
New LSA offsets measured in program
6210. See GHRS-ISR-080.
(ABS//LES)
5.14 Echelle Blaze Function Interpolation and Non-Interpolation (CCR9 and CCRA).
The ECH_CORR calibration step uses the constants contained in these tables to correct echelle observations
for the effect of the echelle blaze function as part of the spectrum rectification process.
Table 16: GHRS Echelle Ripple Interpolation Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045kz.cz9
06 Mar 90
24 Apr 90
DUMMY
Initial delivery from IDT.
(DL//RLG)
bb11038hz.cz9
01 Nov 91
24 Apr 90
INFLIGHT
SV data from IDT; new grating names.
(DL//RLG)
e3t1250az.cz9
29 Mar 94
16 Jan 94
INFLIGHT
Side 1 values modified for Post-Servicing
Mission Side 1 Carrousel positions (which
are based on Side 2 encoder values).
(LES//SJH)
e751042hz.cz9
05 Jul 94
4 Feb 94
INFLIGHT
Post-COSTAR data from IDT. Data may
be incorrect for both gratings.
(CL/PL/SJH)
e8c09237z.cz9
12 Aug 94
4 Feb 94
INFLIGHT
Increased carrousel position range to prevent incorrect interpolation.
(SJH//SJH)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 17
Table 17: GHRS Echelle Ripple Non-Interpolation Constants
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1045mz.cza
06 Mar 90
24 Apr 90
GROUND
Initial delivery from IDT.
(DL//RLG)
bb11038kz.cza
01 Nov 91
24 Apr 90
INFLIGHT
SV data from IDT; new grating names.
(DL//RLG)
e3t1249fz.cza
29 Mar 94
16 Jan 94
INFLIGHT
Side 1 values modified for Post-Servicing
Mission Side 1 Carrousel positions (which
are based on Side 2 encoder values).
(LES//SJH)
e5n1103iz.cza
23 May 94
16 Jan 94
INFLIGHT
Added “CPNORM” column to provide
carrousel position for normalization of ripple function. Corresponding change made
to CALHRS. Table is for post-Side 1 turn
on data.
(SJH//SJH)
e5n1355kz.cza
23 May 94
04 Apr 90
INFLIGHT
Added “CPNORM” column to provide
carrousel position for normalization of ripple function. Corresponding change made
to CALHRS. Table is for pre-COSTAR
data.
(SJH//SJH)
e751041qz.cza
05 Jul 94
04 Feb 94
INFLIGHT
Post-COSTAR IDT values.
(CL/PL/SJH)
e8c0922rz.cza
12 Aug 94
04 Feb 94
INFLIGHT
Corrects values for ECH-A “CPNORM”
column.
(SJH//SJH)
5.15 Scale Factors for Scattered Light Subtraction (CCRB).
The background subtraction step in calibration determines the degree of scattered light in the spectrum.
Currently only the data for the echelle gratings are non-dummy, inflight values. Scattered light
contamination in the 1st order gratings is relatively unimportant.
Table 18: GHRS Scale Factors for Scattered Light Subtraction
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
bbf1357dz.czb
15 Nov 91
24 Apr 90
DUMMY
DUMMY installed by STScI. New gratings names. NOTE: This table is missing
values for some orders.
(SJH//RLG)
bc41437gz.czb
04 Dec 91
24 Apr 90
DUMMY
Data for missing orders added.
(SJH//RLG)
d8b1457az.czb
13 Aug 93
24 Apr 90
INFLIGHT
New scattered light coefficients for
Echelle gratings taken from Cardelli,
Ebbets, and Savage, ApJ 413, p.401,1993.
(SJH//LES)
ga20907fz.czb
01 Oct 96
24 Apr 90
INFLIGHT
Same as above. Resubmitted to correct
CDBS error which triplicated some lines.
(AMG//AMG)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 18
5.16 Global Wavelength Coefficients (CCRC).
The global wavelength coefficients table is used by the wavelength solution calibration step (ADC_CORR)
to determine wavelength coefficients when GWC_CORR is set to PERFORM. This table differs from table
CCR6 in that it is not indexed on carrousel position. Instead, the coefficients to a global solution across all
carrousel positions is contained in table CCRC. This is the preferred method for producing a wavelength
scale.
Table 19: GHRS Global Wavelength Coefficients
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
e3u1428cz.czc
30 Mar 94
24 Apr 90
INFLIGHT
Values for global dispersion coefficient
algorithm to determine wavelengths. Also
includes zero point temperatures of all
GHRS thermal monitors on which Global
Coefficients are based. Data provided by
IDT.
(LES//SJH)
e3u14301z.czc
30 Mar 94
16 Jan 94
INFLIGHT
Side 1 values for global dispersion coefficient determination modified for Post-Servicing Mission Side 1 Carrousel positions
(which are based on Side 2 encoder values).
(LES//SJH)
5.17 Photocathode Blemish Locations (CCRD).
The photocathode blemish location table contains locations of known photocathode blemishes and is used
by calhrs to update data quality flags and to mark regions and severity of blemishes. The table was
delivered 29 March 1994 but may be applied to any observations since launch.
Table 20: GHRS Photocathode Blemish Location Table
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
e3t1028nz.czd
29 Mar 94
24 Apr 90
INFLIGHT
Locations of known photocathode blemishes. Data provided by IDT and used by
CALHRS v.1.3.4 to update data quality
flags to mark region and severity of blemish.
(LES//SJH)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 19
5.18 Background Count Rate Model (CCRE).
The background count rate model is used with the optional background model correction switch
(BMD_CORR), available in calhrs v.1.3.11 (Mar 97). When set to PERFORM, the BMD_CORR
switch will calculate and subtract a model background based on location of the telescope’s orbit instead of
using the background bins obtained with an observation. The SAA Model 7 contour is used to issue
warning messages per readout of an observation (see SAAHFILE). Results from the background count rate
model are not reliable in or near the SAA. This table contains mean derived background count rates as a
function of geomagnetic latitude and longitude. The model is actually the blue FOS model derived by
Rosenblatt, et. al (1992) multiplied by a GHRS-detector-specific scaling factor. Header keywords in the
table contain the multiplicative scaling factors required to scale the results from the model to the
appropriate GHRS detector.
Table 21: GHRS Background Count Rate Model Table
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
h5m13378z.cze
23 May 97
24 Apr 90
INFLIGHT
Rosenblatt, et al.'s FOS Blue background
count rate model (based on geomagnetic
latitude and longitude) multiplied by a
scale factor appropriate to the GHRS
detector. See GHRS-ISR-084. Requires
CALHRS v.1.3.11 or later.
(MdlP//LES)
5.19 Paired-Pulse Corrections (CCG2).
Correction for detector dead-time requires information contained in table CCG2. This table is actually
shared with FOS, although the data used are unique to GHRS.
Table 22: Paired-Pulse Correction Table
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
a3d1145ly.cmg
15 Dec 89
24 Apr 90
GROUND
Initial delivery from IDT.
This table is “shared” with FOS.
(//)
5.20 Platinum-Neon Lamp Line List.
The Platinum-Neon line list table contains laboratory measurements of wavelengths for features of a
Platinum-Neon spectrum calibration lamp. These are uniformly transformed to vacuum wavelengths at all
wavelengths and this information is used during post-pipeline processing by the wavecal task.
Table 23: Platinum-Neon Lamp Line List Table
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
d9r16547z.czy
15 Sep 93
24 Apr 90
GROUND
This table contains laboratory wavelengths
for the Pt-Ne spectral calibration lamps
taken from Reader, et al. Ap.J.Suppl. 72,
1990, p. 831 corrected to vacuum wavelengths. Used by wavecal task.
(JDE//SJH)
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 20
5.21 Small Science Aperture Wavelength Offsets.
The SSA wavelength offset table contains wavelength offsets between the SSA and SC1 and SC2. This
table is used during post-pipeline processing by the wavecal task.
Table 24: Small Science Aperture Wavelength Offsets Table
FILENAME
DATE
USE_AFTER
PEDIGREE
COMMENT
d9f14083z.czz
15 Sep 93
24 Apr 90
GROUND
This table contains offsets between the
SSA and SC1 and SC2. Used by wavecal
task.
(JDE//SJH)
May not have been updated for all postCOSTAR Side 1 Carrousel positions.
23 Jun 97
GHRS Instrument Science Report 067, Official Update #1, Draft
Page 21