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Proceedings Paper

The Chandra X-ray Observatory calibration database (CalDB): building, planning, and improving
Author(s): Dale E. Graessle; Ian N. Evans; Kenny Glotfelty; X. Helen He; Janet D. Evans; Arnold H. Rots; Giuseppina Fabbiano; Roger J. Brissenden
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Paper Abstract

The calibration database implemented for the Chandra X-ray Observatory is the most detailed and extensive CalDB of its kind to date. Built according to the NASA High Energy Astrophysics Science Archive Research Center (HEASARC) CalDB prescription, the Chandra CalDB provides indexed, selectable calibration data for detector responses, mirror effective areas, grating efficiencies, instrument geometries, default source aim points, CCD characteristics, and quantum efficiencies, among many others. The combined index comprises approximately 500 entries. A standard FTOOLS parametric interface allows users and tools to access the index. Unique dataset selection requires certain input calibration parameters such as mission, instrument, detector, UTC date and time, and certain ranged parameter values. The goals of the HEASARC CalDB design are (1) to separate software upgrades from calibration upgrades, (2) to allow multi-mission use of analysis software (for missions with a compliant CalDB) and (3) to facilitate the use of multiple software packages for the same data. While we have been able to meet the multivariate needs of Chandra with the current CalDB implementation from HEASARC, certain requirements and desirable enhancements have been identified that raise the prospect of a developmental rewrite of the CalDB system. The explicit goal is to meet Chandra's specific needs better, but such upgrades may also provide significant advantages to CalDB planning for future missions. In particular we believe we will introduce important features aiding in the development of mission-independent analysis software. We report our current plans and progress.

Paper Details

Date Published: 30 June 2006
PDF: 12 pages
Proc. SPIE 6270, Observatory Operations: Strategies, Processes, and Systems, 62701X (30 June 2006); doi: 10.1117/12.672876
Show Author Affiliations
Dale E. Graessle, Smithsonian Astrophysical Observatory (United States)
Ian N. Evans, Smithsonian Astrophysical Observatory (United States)
Kenny Glotfelty, Smithsonian Astrophysical Observatory (United States)
X. Helen He, Smithsonian Astrophysical Observatory (United States)
Janet D. Evans, Smithsonian Astrophysical Observatory (United States)
Arnold H. Rots, Smithsonian Astrophysical Observatory (United States)
Giuseppina Fabbiano, Smithsonian Astrophysical Observatory (United States)
Roger J. Brissenden, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 6270:
Observatory Operations: Strategies, Processes, and Systems
David R. Silva; Rodger E. Doxsey, Editor(s)

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