tokens: P.S. is a Covington Fellow at DRAO. S.B. and S.C. acknowledge support from NASA Chandra grants GO7-18059A and GO7-18059B issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060. J.W.T.H. acknowledges funding from an NWO Vidi fellowship. J.W.T.H. and C.G.B. acknowledge support from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement nr. 337062 (DRAGNET; PI Hessels). L.G.S. gratefully acknowledges support from the ERC Starting Grant BEACON under contract no. 279702 and the Max Planck Society. V.M.K. holds the Lorne Trottier and a Canada Research Chair and receives support from an NSERC Discovery Grant and Herzberg Prize, from an R. Howard Webster Foundation Fellowship from the Canadian Institute for Advanced Research (CIFAR), and from the FRQNT Centre de Recherche en Astrophysique du Quebec. C.J.L. is supported by the NSF under grant No. 1611606. B.M. acknowledges support from the Spanish Ministerio de Economía y Competitividad (MINECO) under grants AYA2016-76012-C3-1-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia “María de Maeztu”). The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Arecibo Observatory is operated by SRI International under a cooperative agreement with the National Science Foundation (AST-1100968), and in alliance with Ana G. Méndez-Universidad Metropolitana, and the Universities Space Research Association. Based on observations with the 100 m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg. Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. This research has made use of data obtained from the Chandra Data Archive, and software provided by the Chandra X-ray Center (CXC) in the application package CIAO. Facilities: GBT (GUPPI) , Arecibo (PUPPI) , Effelsberg (PFFTS) , XMM (EPIC/pn , EPIC/MOS) , CXO (ACIS-I) , Fermi (GBM). Software: PRESTO, XMM SAS v16.0, HEASoft v6.19, CIAO v4.8.2.
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