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GHRS Instrument Handbook 5.0 115
Index

116 GHRS Instrument Handbook 5.0
A
Accumulation Mode 13, 19, 34, 43--45
CENSOR 44
details 95--96
CENSOR, see also noise rejection
COMB 15, 44
DOPPLER 44
FP­SPLIT 14, 30, 43, 44
high signal­to­noise methods 107
parameter summary 44
STEP­PATT 15, 44, 92, 114
STEP­TIME 44
substepping 19
acquisition parameters
ACQ/PEAKUP, see acquisition parameters,PEAKUP
BRIGHT and FAINT limits 17, 26, 37, 41
calculating 68
BRIGHT=RETURN 17, 25, 34, 37, 41, 71
BRIGHT=RETURN compared to specifying limits 37
DEC­OFF 40
ETA­OFF 40
EXTENDED 39
LOCATE 17, 41
LOCATE=EXTENDED 8
MAP 37, 40, 41, 42
MAP=ALL­POINTS 40
PEAKUP 15, 34, 38, 40, 41
STEP­TIME 71
RA­OFF 40
SEARCH­SIZE 36, 37, 40
Special Requirements 41
STEP­TIME 71
for PEAKUP 71
maximum permitted 38
STEP­TIME as COMMENT 41
summary 40
XI­OFF 40
acquisitions 15, 17, 24, 34, 35--41, 68--80
early 16, 18, 25, 35, 36
extended objects 39, 76
faint objects 39
DARK TIME 39, 80
Side 2 acquisition for Side 1 observing 8, 38
using FOS 8, 39
flux measurement 17
initial pointing 35
interactive 16, 18, 24, 35
offseting
and guide stars 40
offsetting 36, 39
onboard 17, 36, 40
parameter summary 40
real time, see acquisitions, interactive
reddening 68
see also targets
spiral search 36, 37
targets, see targets
apertures 12
angular scale 9
LSA 9, 12, 17, 18, 28, 34, 35, 36, 38, 41, 42, 85, 1
12
shutter 12, 28
nomenclature 9
physical locations 58
physical size 60
plate scale 9
SSA 9, 12, 17, 28, 34, 38, 41, 42, 114
B
background
echelle interorder 19
geocoronal Lyman­a 80
LSA shutter 12
measurement 92
scattered light 87, 88
echelles 103
bandpass 87, 88
blaze function 91, 111
C
calibrations
precision and accuracy 46
wavelength 34, 47, 98
aperture offsets 98
contamination from SSA 98
geomagnetic effects 99
lamps 98
line widths 98
tables 102
thermal effects 99
carrousel 14
CENSOR
see noise rejection
Continuous Viewing Zone 16, 112
conventions
text 7
units 8
coordinated observations 47
cosmic rays 95
CVZ, see Continuous Viewing Zone
Cycle 5 111
D
DARK TIME Special Requirement 39, 80
data quality 43
deadtime correction
see paired pulse correction
deconvolution 103
DEFCAL 112
detectors 60
count rate linearity 98
D1 14
D2 14
dark count 95
Digicon, see Digicon
granularity 14
image stability 98
sampling 15

GHRS Instrument Handbook 5.0 117
Digicon 14
paired pulse correction 71
diodes
corner 28, 92
focus 42, 43, 112
science 92
diodes, corner 111
Doppler shift 19, 44, 46
E
early acquisition, see acquisitions, early
e­mail addresses 2
exposure time calculation 26
extinction, ultraviolet 93, 102
F
fluxes, variable 18
FLYLIM
see noise rejection
FOC 18, 24, 35, 36, 43
G
geocoronal Lyman­a 27, 80, 105
geomagnetically­induced image motion 47, 98, 112
GHRS
as slitless spectrograph 43
paired pulse correction 71
photometric precision 13
Point Spread Function 94
resolving power 12, 83, 103
scientific papers 104
STScI contacts 2
technical papers 102
time resolution 13
useful wavelength range 12
granularity 14
gratings
cross­dispersers 60
Ech­A 87
Ech­B 88
echelle 12, 14, 60
bandpass and sensitivity 87
blaze function 91, 111
resolving power 83
scattered light 87
wavelength format 89
first­order 12, 14, 60, 85
resolving power 83
useful ranges 83
holographic 14
GSC 35, 112
H
HST memory capacity 13, 16, 47
I
IMAGE Mode 16, 20, 40, 42--43
as slitless spectrograph 43
critically sampling 42
DELTA­X, DELTA­Y 42
maximum STEP­TIME 43
NX, NY 42
parameter summary 42
PRECISION 43
interactive acquisitions, see acquisitions, interactive
L
Large Science Aperture, see apertures, LSA
Line Spread Function (LSF) 103
M
MAP, see acquisition parameters,MAP
mirrors 36, 40, 42, 60
A1 14, 25
A2 14
attenuated 14
Cam­A 14
Cam­B 14
effective areas 78
N1 14
N2 14
normal 14
moving targes, see targets, moving
N
NO GAP Special Requirement 34
noise rejection
CENSOR 27, 95
FLYLIM 9, 27, 45, 97
noise, fixed­pattern 30
O
OSCAN Mode 20, 45
see also parameters for Accumulation Mode
OSS 112
P
paired pulse correction 71
peakup, see acquisition parameters,PEAKUP
Phase I 22, 113
acquisitions 24
Phase II 22, 113
photometric precision 13
plate scale 9
Point Spread Function 94, 103
R
RAPID Mode 13, 16, 20, 45, 46
SAMPLE­TIME 20, 46
Rapid Readout Mode, see RAPID Mode
reddening 27, 93, 102
effect on acquisition count rates 68
resolution, time 13
resolving power 12, 83
ripple function
see blaze function

118 GHRS Instrument Handbook 5.0
S
SAA, see South Atlantic Anomaly
sampling 15
scattered light 28, 87, 88
SEARCH­SIZE, see acquisition parameters,SEARCH­
SIZE
sensitivity 26
sensitivity function 85
Side 1 8, 12, 113
Side 2 12, 113
signal­to­noise estimation 29
slitless spectrograph mode 43
Small Science Aperture, see apertures, SSA
South Atlantic Anomaly 16, 19, 27, 95, 113
spectrograph temperature 47
Spectrum Y Balance, seeSPYBAL
spiral search, see acquisitions, spiral search
SPYBAL 19, 113
STEIS 10, 114
STEP­TIME 114
substepping 92
T
targets
bright problems 25
complex 38
coordinates 18
crowded fields 25, 35
extended 8, 18, 26
faint 26, 39
moving 18, 25, 35
nearby neighbors 18
offsetting 36, 39
point source 36
variable 18, 26, 35
Targets of Opportunity 47
telephone numbers 2
time resolution 13
W
wavelength tables 102
WFPC2 18, 24, 35, 36
WSCAN Mode 20, 45
see also parameters for Accumulation Mode
WAVE­STEP 45