Modelling the spectral response of the Swift-XRT CCD camera: experience learnt from in-flight calibration

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Volume 494 / No 2 (February I 2009)

A&A, 494 2 (2009) 775-797

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Table 2:

Summary of the releases of the XRT post-launch gain files.
Release	Release	Main improvements in the gain	Text section
number $^\dagger$	date		number
05	2005 April 5	Introduction of a temperature-dependent gain file	3.2.3
06	2005 October 28	Update of the gain coefficients over time	-
07^*	2007 July 9	Update of the CTI values over time in WT & PC mode	3.2.2
		Update of the gain coefficients in WT & PC modes after the substrate	4.3
		voltage ( $V_{\rm ss}$ ) change from 0 V to 6 V on 2007 August 30
08	2008 June 25	Introduction of an offset of C₃=17.6 eV to restore the WT energy scale	3.2.4

$^\dagger$ The v003-v004 gain files correspond to the pre-launch gain files.
^* The gain file has now added a suffix ``s0'' or ``s6'' to indicate the appropriate substrate voltage ( $V_{\rm ss}$ ). The ``s0'' files are valid from the start of the mission until when the substrate voltage was raised to $V_{\rm ss}=6$ V on 2007 August 30.

Source LaTeX | All tables | In the text

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