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GHRS Instrument Handbook 4.1 111
Index

112 GHRS Instrument Handbook 4.1
A
Accumulation Mode 15, 20, 34, 43--45
CENSOR 45
details 88--89
COMB 16, 44
DOPPLER 45, 104--105
FP­SPLIT 16, 44
parameter summary 44
STEP­PATT 17, 44, 84
STEP­TIME 45
substepping 20
acquisitions 17, 18, 25, 34, 34--41
ACQ/PEAKUP, see acquisitions, PEAKUP 40
BRIGHT and FAINT limits 19, 26, 36, 37, 40
calculating 66
BRIGHT=RETURN 8, 18, 26, 36, 37, 40
BRIGHT=RETURN compared to specifying limits 37
COSTAR mirrors 79
DEC­OFF 39
early 17, 19, 25, 26, 35, 36
ETA­OFF 39
flux measurement 19, 39
initial pointing 35
interactive 17, 19, 25, 35
LOCATE 19, 40
LOCATE=EXTENDED option 8
MAP 37, 38, 40, 41
MAP=ALL­POINTS 38
mirrors, see mirrors
offseting
and guide stars 39
offsetting 36, 39
onboard 18, 36, 39
parameter summary 40
PEAKUP 17, 34, 37, 38, 39, 40
in SSA 8, 108--109
STEP­TIME 71
RA­OFF 39
real time, see acquisitions, interactive
reddening 66
SEARCH­SIZE 35, 36, 37, 40
see also targets
Special Requirements 40
spiral search 35, 37, 39
STEP­TIME 38, 69
for PEAKUP 71
STEP­TIME as COMMENT 40
targets, see targets
time requirements 39
XI­OFF 39
apertures 14
angular scale 9
LSA 9, 14, 18, 19, 34, 35, 36, 38, 39, 40, 41, 42, 85, 100
shutter 14, 29
nomenclature 9
physical size 58
plate scale 9
SC1 and SC2 10
SSA 9, 14, 19, 37, 38, 40, 42, 102, 108--109
B
background
echelle interorder 20
geocoronal Lyman­a 79
LSA shutter 14, 29
measurement 84
scattered light 82
echelles 95
bandpass 82
C
calibrations 24
non­standard 43
standard 43
wavelength 10, 44, 90
aperture offsets 90
contamination from SSA 90
geomagnetic effects 91
lamps 10, 90
line widths 90
tables 94
thermal effects 90
Call for Proposals 6, 8, 10, 18, 24, 46
carrousel 15, 16
Continuous Viewing Zone 18, 99
conventions
text 8
units 8
coordinated observations 46
cosmic rays 88
COSTAR 7, 8, 10, 77
effect on GHRS focal plane 54
mirror reflectance 79
see also Servicing Mission
CVZ, see Continuous Viewing Zone
Cycle 4 10, 99
D
DARK TIME Special Requirement 79
data quality 43
deadtime correction
see paired pulse correction
deconvolution 95
DEFCAL 39, 100
detectors 58
count rate linearity 89
D1 16
D2 16
dark count 88
Digicon, see Digicon
granularity 16
image stability 90
sampling 17
Digicon 16, 20
paired pulse correction 71
diodes
corner 28, 84
focus 41, 42, 100
science 84
Doppler shift 20, 45, 46, 104--105

GHRS Instrument Handbook 4.1 113
E
early acquisition, see acquisitions, early
e­mail addresses 2
exposure time calculation 27
extinction, ultraviolet 87
F
fluxes, variable 19
FOC 19, 25, 35, 36, 42
G
geocoronal Lyman­a 79
geomagnetically­induced image motion 43, 90
GHRS
as slitless spectrograph 42
paired pulse correction 71
photometric precision 15
resolving power 14, 81, 95
scientific papers 96
STScI contacts 2
technical papers 94
throughput 9
time resolution 15
useful wavelength range 14
wavelength bandpass 15
GHRS relay box 7, 8
see also Servicing Mission
granularity 16
gratings
cross­dispersers 58
Ech­A 82
Ech­B 82
echelle 14, 16, 58
resolving power 81
Ripple Function 27, 83, 101
first­order 7, 14, 15, 58, 85
resolving power 81
useful ranges 80
G140L 7
G140M 7
holographic 15
GSC 35, 100
H
HST memory capacity 15, 18, 46
I
IMAGE Mode 17, 21, 38, 41--42
as slitless spectrograph 42
critically sampling 42
DELTA­X, DELTA­Y 42
NX, NY 42
parameter summary 42
PRECISION 42
interactive acquisitions, see acquisitions, interactive
L
Large Science Aperture, see apertures, LSA
Line Spread Function (LSF) 95
Lyman­a 80
M
MAP, see acquisitions, MAP
mirrors 36, 40, 42, 58
A1 10, 16, 26
A2 16, 26
attenuated 16
Cam­A 16
Cam­B 16
effective areas 77
N1 10, 16
N2 16
normal 16
moving targes, see targets, moving
O
OSCAN Mode 21, 45
see also parameters for Accumulation Mode
OSS 35, 100
P
paired pulse correction 71
peakup, see acquisitions, PEAKUP
Phase I 24, 100
acquisitions 25
spacecraft time 24
Phase I Proposal Instructions 10, 24
Phase II 24, 101
Phase II Instructions for the Solar System Target List 34
Phase II Proposal Instructions 6, 10, 34, 42
photometric precision 15
plate scale 9
Point Spread Function (PSF) 95
R
RAPID Mode 15, 18, 21, 46
SAMPLE­TIME 21, 46
Rapid Readout Mode, see RAPID Mode
reddening 27, 87
effect on acquisition count rates 66
Remote Proposal Submission System, see RPSS
resolution, time 15
resolving power 14, 81
Return­to­Brightest, see acquisitions, BRIGHT=RETURN
Ripple Function 27, 83, 101
RPSS 10
S
SAA, see South Atlantic Anomaly
sampling 17
scattered light 82
SEARCH­SIZE, see acquisitions, SEARCH­SIZE
sensitivity 27
sensitivity function 85
Servicing Mission 7, 8, 10
see also COSTAR and GHRS relay box
Side 1 7, 14, 26, 101
proposing to use 7, 9
Side 2 9, 14, 101
slitless spectrograph mode 42
Small Science Aperture, see apertures, SSA

114 GHRS Instrument Handbook 4.1
South Atlantic Anomaly 18, 20, 88, 101
spacecraft time 24
spectrograph temperature 43
Spectrum Y Balance, seeSPYBAL
spiral search, see acquisitions, spiral search
SPYBAL 20, 101
STEIS 6, 11, 102
STSDAS Calibration Guide 6, 7
substepping 84
T
targets
bright problems 25
complex 38
coordinates 19
crowded fields 26, 35
extended 19, 26
faint 37
moving 19, 26, 35
nearby neighbors 19
offsetting 36, 39
point source 36
variable 19, 26, 35
Targets of Opportunity 46
telephone numbers 2
throughput 9
time resolution 15
W
wavelength bandpass 15
wavelength calibrations, see calibration,s wavelength
wavelength tables 94
WFPC2 19, 25, 35, 36
WSCAN Mode 21, 45
see also parameters for Accumulation Mode
WAVE­STEP 45