Dr. Dale Edward Graessle


Of course we can understand this world.--
What else is the mind for?


Work Information

Hot List

Contact Information

Current Projects

Biographical Information

Work Information

Job title


Key responsibilities

  1. CXCDS Calibrations Coordinator
  2. (
  3. Chandra X-ray Observatory Calibration Database
  4. (
  5. Synchrotron Reflectance Calibrations of AXAF Witness Mirrors, 0.05 - 12.0 keV (Synch)
  6. CCW 2004 Presentation: "Revisiting Iridium Optical Constants and the HRMA Effective Area" (CCW04 Talk)
  7. CCW 2007 Presentation: "Upgrading the Chandra/HEASARC CalDB Index and Software Interface" (CCW07 Poster)

Department or workgroup

  1. CXC Data Systems Group
  2. (Formerly) AXAF Mission Support Team

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Hot List

CALDB updates


CALDB docs and procs

AXAF Synchrotron Studies (Docs and Pubs index)

AXAF Synchrotron Mirror Data (index)

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Contact Information

E-mail (non-emergency): dgraessle@head-cfa.harvard.edu

E-mail (emergency): calco@head-cfa.harvard.edu

The system alias "calco" above sends email to "graessle", "caldbmgr", and my cell phone 7814548965@vtext.com. Use only when you need really rapid response.

Web address:

http://hea-www.harvard.edu/~graessle (this page).

http://icxc.harvard.edu/calco (CALCO home page).

http://cxc.harvard.edu/caldb (Public CALDB page).

http://hea-www.harvard.edu/~graessle/synch (Synchrotron home page)

Office phone:

(617)495-7041 (answering machine after four rings!)

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Current Projects

The Chandra CALDB

Development of terms and procedures for the completion and implementation of an ongoing database.

Chandra continuum source data for mirror calibration check/verification

Was it really worth it to go to the synchrotron for 10 years?

NIAC studies

Build and launch a formation-flying hard X-ray telescope, with separate mirror and replaceable detector vehicles.

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Biographical Information

To be read only at bedtime. . .


AGE: 39 years old (for the past several years). No one really knows. . .

Born: Jefferson City, MO

BS Physics, University of Missouri - Columbia, 1981.

PhD Physics, University of Wisconsin - Madison, 1989.

1989 - present: Smithsonian Astrophysical Observatory, working on Chandra X-ray Observatory.

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Last revised: 2003-10-01 -- D. Graessle