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 3:

Summary of the releases of the XRT post-launch RMFs.
Release number $^\dagger$	Release date	Main improvements in the RMFs	Text section number
07	2005 April 5	Line shoulder: ad-hoc increase of threshold to favour	3.3.3
		sub-threshold losses in PC & WT mode
08	2006 April 24	Low-energy response: change in the description the	3.3.1
		surface loss function in PC & WT mode
09 $^\ddagger$	2007 May 31	Line shoulder: New description of the charge cloud in	3.3.3
		the field-free region for high-energy photons (E > 2 keV)
		in PC mode
		Shelf: Rescaling of the shelf in both PC & WT mode	3.3.2
11^*	2008 June 25	Loss function: New description of the surface loss function	3.3.4
		in the 1-2 keV energy range in WT mode

$^\dagger$ The v006 response files correspond to the pre-launch response files.
$^\ddagger$ The v009 response files were renamed as v010 response files when the substrate voltage was raised from 0 to 6 V on 2007 August 30 (see Sect. 4.3) following an update of the ground software.
^* http://swift.gsfc.nasa.gov/docs/heasarc/caldb/swift/docs/xrt/SWIFT-XRT-CALDB-09_v11.pdf (Godet et al. 2008).

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