ESA has issued the XMM-Newton 17th Announcement of Opportunity (AO-17) on 22 August 2017
The seventeenth Announcement of Opportunity (AO-17) soliciting proposals for XMM-Newton observations is now open until Friday 6 October 2017, 12:00 UT. This AO covers the period May 2018 to April 2019 and is open to proposers from all over the world.
Full details of this Announcement of Opportunity, including all the relevant documentation, are given on the dedicated AO-17 webpage of the XMM-Newton Science Operations Centre (SOC).