Directory Structure

Introduction: Header Keywords; Directory Structure; Indexing System; Versioning
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CALDB 3.4.3 should not be used unless you are running CIAO 3.4 or CIAO 4.0.

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News

31 Mar 2008 [New]

CalDB 3.4.3, an upgrade to CalDB 3.3.0 or later versions, which introduces ACIS -110C "Epoch 0" T_GAINs for ACIS-S1 and -S3, and ACIS -120C EPOCH 32 (Nov 07 - Jan 08) T_GAIN updates, has been released to the public. See the CalDB 3.4.3 release notes for more information on this upgrade.

14 Dec 2007

CalDB 3.4.2, an upgrade to CalDB 3.3.0 or later versions, which updates ACIS T_GAINs for Aug - Oct 2007, has been released to the public. See the CalDB 3.4.2 release notes for more information on this upgrade.

14 Sep 2007

CalDB 3.4.1, an upgrade to CalDB 3.3.0 or later versions, which introduces new and finalized ACIS blank sky, T_GAIN, and HRC-I DEGAP files, has been released to the public. See the CalDB 3.4.1 release notes for more information on this upgrade.

16 May 2007

CalDB 3.4.0, an upgrade to CalDB 3.3.0/3.3.0.1, which introduces new ACIS T_GAIN, grating mask files, as well as upgrades to HRC-I GMAPS and HRC-S QE, has been released to the public. See the CalDB 3.4.0 release notes for more information on this upgrade.

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.