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tokens: ACKNOWLEDGEMENTS This research has made use of data and/or software 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. We acknowledge the use of public data from the Swift and Fermi data archives. In this work, we analysed observations performed with INTEGRAL , an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain) and with the participation of Russia and the USA. We also acknowledge the use of NASA’s Astrophysics Data System (ADS) and of the SIMBAD data base, operated at CDS, Strasbourg, France. We thank Dr. David Smith for useful discussions on Fermi LAT pulsar timing issues, and Dr. Matthew Kerr for providing radio pulsar ephemerides for PSR B1509−58.