tokens: We thank N. Schartel for the possibility to perform the ToO observation in the Director Discretionary Time, and the XMM–Newton team for the support for the observation. We gratefully acknowledge the Sardinia Regional Government for the financial support (P. O. R. Sardegna F.S.E. Operational Programme of the Autonomous Region of Sardinia, European Social Fund 2007-2013 – Axis IV Human Resources, Objective l.3, Line of Activity l.3.1). This work was partially supported by the Regione Autonoma della Sardegna through POR–FSE Sardegna 2007–13, L.R. 7/2007, Progetti di Ricerca di Base e Orientata, project no. CRP-60529. We also acknowledge financial contribution from the agreement ASI-INAF I/037/12/0. The High-Energy Astrophysics Group of Palermo acknowledges support from the Fondo Finalizzato alla Ricerca (FFR) 2012/13, project no. 2012- ATE-0390, founded by the University of Palermo.
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