Rest-frame 0.2−10 keV light-curve of PG1247 since its first detection with ROSAT in 1993 (black filled square). The empty square shows the ROSAT data reanalyzed in Boller et al. (2016). The black triangle represents the ASCA measurement (1995). The red diamond represents the XMM-Newton measurement of 2003. The gray points represent the monitoring performed with Swift between 2007 and 2013 (Shemmer et al. 2014), and the magenta point shows the NuSTAR measurement in 2014.