tokens: Acknowledgements This research has made use of data and 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. It is additionally based on observations obtained with XMMNewton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. The research also made use of the Swift /BAT transient monitor results provided by the Swift /BAT team. We would like to thank all the proposers of the archival observations used in this work. We would also like to thank the anonymous referee for his/her suggestions, which helped improve the manuscript.
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