HST Data Handbook for ACS

3.3 Keyword Usage

CALACS processing will be controlled by the population of keywords and calibration switches in the input image headers. Those keywords essential for CALACS remain a subset of those used by CALSTIS, with keywords relating to spectroscopy and image binning being absent. Table 3.3 provides a summary of the keywords used by CALACS, specifying whether they function as input or output. For a definition of each keyword, refer to table 2.6.
Table 3.3: ACS Keywords used with CALACS

Keyword Task(s) I/O Header Sample of Possible Values

APERTURE acsccd, acs2d, acssum Input Primary WFC1,WFC2,WFC1-FIX, WFC2-FIX,WFC,HRC,SBC,...

ATODGNA, ATODGNB, ATODGNC, ATODGND acsccd, acs2d, acsrej Input/Output Primary

BADINPDQ acsrej Output Primary

BINAXIS1, BINAXIS2 calacs, acsccd, acs2d Input Primary

CCDAMP acsccd, acs2d, acsrej Input Primary ABCD, ABC, ABD, ACD, BCD, AC, AD, BC, BD

CCDCHIP acsccd, acs2d, acsrej, acssum Input SCI,DQ,ERR 1,2

CCDGAIN calacs, acsccd, acs2d Input Primary 1,2,4,8

CCDOFSTA, CCDOFSTB, CCDOFSTC, CCDOFSTD acsccd, acs2d Input Primary

CRRADIUS acsrej Output Primary

CRMASK acsrej Output Primary

CRSIGMAS acsrej Output Primary

CRTHRESH acsrej Output Primary

DETECTOR calacs, acsrej, acssum Input Primary WFC,HRC,SBC

FILTER1, FILTER2 acsccd, acs2d, acssum Input Primary CLEAR1L, F555W, F660N, F850LP, POL60UV

GLOBLIM acs2d Output SCI EXCEEDED,NOTAPPLICBLE, UNDETERMINED

GLOBRATE acs2d Input SCI

INITGUES acsrej Output Primary

LTM1_1, LTM2_2 acsccd, acs2d Input/Output SCI,ERR,DQ

LTV1, LTV2 acsccd, acs2d Input/Output SCI,ERR,DQ

NPIX1,NPIX2 calacs Output SCI

READNSEA, READNSEB, READNSEC, READNSED acs2d, acsccd, acsrej Input/Output SCI

REJ_RATE acsrej Output Primary

SCALENSE acsrej Output Primary

SDQFLAGS acs2d, acsccd, acssum Input Primary

STATFLAG calacs Input Primary T,F

Keyword	Task(s)	I/O	Header	Sample of Possible Values
APERTURE	acsccd, acs2d, acssum	Input	Primary	WFC1,WFC2,WFC1-FIX, WFC2-FIX,WFC,HRC,SBC,...
ATODGNA, ATODGNB, ATODGNC, ATODGND	acsccd, acs2d, acsrej	Input/Output	Primary
BADINPDQ	acsrej	Output	Primary
BINAXIS1, BINAXIS2	calacs, acsccd, acs2d	Input	Primary
CCDAMP	acsccd, acs2d, acsrej	Input	Primary	ABCD, ABC, ABD, ACD, BCD, AC, AD, BC, BD
CCDCHIP	acsccd, acs2d, acsrej, acssum	Input	SCI,DQ,ERR	1,2
CCDGAIN	calacs, acsccd, acs2d	Input	Primary	1,2,4,8
CCDOFSTA, CCDOFSTB, CCDOFSTC, CCDOFSTD	acsccd, acs2d	Input	Primary
CRRADIUS	acsrej	Output	Primary
CRMASK	acsrej	Output	Primary
CRSIGMAS	acsrej	Output	Primary
CRTHRESH	acsrej	Output	Primary
DETECTOR	calacs, acsrej, acssum	Input	Primary	WFC,HRC,SBC
FILTER1, FILTER2	acsccd, acs2d, acssum	Input	Primary	CLEAR1L, F555W, F660N, F850LP, POL60UV
GLOBLIM	acs2d	Output	SCI	EXCEEDED,NOTAPPLICBLE, UNDETERMINED
GLOBRATE	acs2d	Input	SCI
INITGUES	acsrej	Output	Primary
LTM1_1, LTM2_2	acsccd, acs2d	Input/Output	SCI,ERR,DQ
LTV1, LTV2	acsccd, acs2d	Input/Output	SCI,ERR,DQ
NPIX1,NPIX2	calacs	Output	SCI
READNSEA, READNSEB, READNSEC, READNSED	acs2d, acsccd, acsrej	Input/Output	SCI
REJ_RATE	acsrej	Output	Primary
SCALENSE	acsrej	Output	Primary
SDQFLAGS	acs2d, acsccd, acssum	Input	Primary
STATFLAG	calacs	Input	Primary	T,F

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