Chandra X-Ray Observatory
	(CXC)
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Last modified: 13 March 2017

Dead Time


X-ray detectors may not be active for the full observation - e.g. the 41 ms transfer time for ACIS in timed-exposure mode and the rate-dependant sensitivity of the HRC - which is referred to as the dead time for the observation.

The DTCOR header keyword represents the dead-time correction used for a particular observation.



Last modified: 13 March 2017
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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.