Directory Structure

Introduction: Header Keywords; Directory Structure; Indexing System; Versioning
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News

18 Sep 2009 [New]

CalDB 3.5.5 an upgrade for the CIAO 3.4 CalDB from any previous version, which includes the latest ACIS T_GAIN epoch updates, has been released to the public. See the CalDB 3.5.5 Release Notes for details.

13 Jul 2009

CalDB 3.5.4 an upgrade for the CIAO 3.4 CalDB from any previous version, which includes the latest ACIS T_GAIN epoch updates, has been released to the public. See the CalDB 3.5.4 Release Notes for details.

01 Apr 2009

CalDB 3.5.3 an upgrade for the CIAO 3.4 CalDB from any previous version, which includes the latest ACIS T_GAIN epoch updates, has been released to the public. See the CalDB 3.5.3 Release Notes for details.

29 Jan 2009

CalDB 3.5.2, and upgrade for the CIAO 3.4 CalDB for any earlier version of CalDB 3.x.x, has been released. It includes upgrades to the HRMA Axial Effective Area, and an incumbent upgrade to the HETG Grating Efficiencies file. See the CalDB 3.5.2 Release Notes for details.

Directory Structure

The directory structure itself is determined by the keyword conventions, while the location of a given file within the CALDB is determined by its header keyword values. The CALDB directory structure is given in Table 1, which may be used to locate a specific file in your local CALDB.

**Table 1: Directory structure of the Chandra CALDB.**
TELESCOP	INSTRUME	INDEX/CCLS	CCNM
$CALDB/data/chandra/	acis/	index/	(ACIS index files)
		bcf/	badpix, evtsplt, gain, gtilim, grade, qe
		cpf/	2dpsf, fefs, osip
	ephin/	index/	(EPHIN index files)
		bcf/	geom
	hrc/	index/	(HRC index files)
		bcf/	badpix, degap, fptest, eftest, gtilim, sattest, tapring, qe
		cpf/	2dpsf
	pcad/	index/	(PCAD index files)
		bcf/	align, badpix, ccd, cti, fdc, image, iru, rws, sfma
	sim/	index/	(SIM index files)
		bcf/	pos, poscorr
	tel/	index/	(TEL index files)
		bcf/	aimpts, geom, sky, tdet, obitol
		DETNAM (`INSTRUME="TEL"`)	CCLS (`GRATING="NONE"`)	CCNM
		hrma/	bcf/	effarea, vignet
			cpf/	rpsf, wpsf
			GRATING	CCLS	CCNM
		grating/	hetg/	bcf/	greff
				cpf/	arf, rmf
			letg/	bcf/	greff
				cpf/	arf, rmf

The structure under the "tel" branch is dictated by the guidelines in the ASC FITS Designer's Guide (PS, 40pp). The GRATING keyword and a corresponding classification keyword in the index file are both required.