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Table 1

Observation log of the X-ray, optical imaging, and spectroscopic data coverage of XMMU J1230.3+1339.

Observatory Instrument Data type Date Exposure time Observation ID

XMM-Newton EPIC X-ray Jun. 2002 14 ks/3.9 h 0112552101
XMM-Newton EPIC X-ray Jul. 2002 13 ks/3.6 h 0106060401
Chandra ACIS-S X-ray Apr. 2008 38 ks/10.6 h 9527

VLT FORS 2 R   z imaging 11 Mar. 2007 1.4 ks/0.4 h 078.A-0265
LBT LBC U   B   V   r′   i′   z′ imaging 28 Feb.–2 Mar. 2009 37 ks/10.3 h

VLT FORS 2 MXU spectroscopy 27 Apr. & 6–7 Jun. 2008 2.2 ks/3.9 h 081.A-0312

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