Table 1: Log of X-ray and optical observations.

Date	Instrument	Total duration	Sampl. time
(Y/M/D)		[ks]	[s]
28/06/2004	XMM-PN	29.4
	XMM-MOS1	31.6
	XMM-MOS2	31.6
	XMM OM-UVW1	0.8
	XMM OM-UVM2	1.3
	XMM OM-UVW2	1.4
14/02/2007	CAHA 2.2 m CAFOS	8.7	440
19/03/2007	CAHA 2.2 m (R)	14	45