tokens: The scientific results reported in this article are based on observations obtained with the Chandra X-ray Observatory and XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. This research has made use of software provided by the Chandra X-ray Center (CXC) in the application package ciao , and of softwares and tools provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. This research is based on observations with the NASA/UK/ASI Swift mission. We thank N. Schartel for approving the XMM–Newton 2014 November observation through the Director's Discretionary Time program and the staff of the XMM–Newton Science Operation Center for performing the Target of Opportunity observations. Similarly, we thank B. Wilkes for approving the Chandra 2014 August observation through the Director's Discretionary Time program and the Chandra staff for performing the Target of Opportunity observations. We thank the Swift duty scientists and science planners for making these observations possible. The Parkes radio telescope is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The authors warmly thank Phil Edwards for the prompt scheduling of the observations and John Reynolds for releasing part of the telescope time of his project. We thanks Jules Halpern for useful comments. NR is supported by an NWO Vidi Grant, and by grants AYA2012-39303 and SGR2014-1073. This work is partially supported by the European COST Action MP1304 (NewCOMPSTAR).
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