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 1:

Summary of the in-flight calibration targets used since the launch on 2004 November 20.
Object $^\ddagger$	Type	Mode	Purpose	Exposure (ks)
RXJ 1856.5-3754^x,c,s	Neutron star	PC/WT	Low energy response	81/70 (31/40) $^\dagger$
PKS 0745-19	Cluster of	PC	Effective area	63 (20)
	galaxies
2E 0102-723^x,c,s	Line-rich SNR	PC	Gain, energy resolution and	119 (28)
		WT	shoulder	76 (26)
Cas A^x,c,s	Line-rich SNR	PC	Energy scale offset, gain, shoulder,	235 (67)
		WT	CTI and energy resolution	62 (39)
3C 273 ^*/x,r,c,s	Quasar	WT	Effective area	18
PSR 0540-69^x	Pulsar	PC/WT	Effective area	56/26 (25 in PC)
PKS 2155-304^*/x	Blazar	PC/WT	Effective area	14/13 (5/9)
NGC 7172^*/x	Seyfert 2	PC	Redistribution	15
G21.5^x	Featureless SNR	PC	High-energy shelf	43 (78 in PC & 77 in WT)
Mkn 421^*	Blazar	WT	Effective area	33 (10)
Crab ^x,c,s,r,i	Pulsar/SNR	WT	Effective area	46 (5)

$^\ddagger$ The letter indices x, c, s, r, i correspond to sources observed by other X-/Gamma-ray instruments for calibration purposes: XMM-Newton; Chandra; Suzaku; RXTE; INTEGRAL, respectively.
$^\dagger$ The numbers in parentheses correspond to the exposure time collected from September 2007 to the end of December 2007 and dedicated to the re-calibration of the XRT after the substrate voltage change (see Sect. 4.3), while the other numbers correspond to the calibration data collected prior to the substrate voltage change on 2007 August 30.
^* This symbol corresponds to the sources for which simultaneous calibration observations were performed with the XMM-Newton EPIC cameras.

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