Proposer's Documents and Manuals Documentation to assist XMM-Newton Proposers can be found here: e.g. Users Handbook
AO-18 Information Details regarding the 18th announcement of opportunity (AO-18)
OTAC Results Results of the XMM-Newton Observation Time Allocation Committee including the latest results of AO-17.
Target Visibility Tool The XMM-Newton Target Visibility Checker
Target Search Tool Search planned & performed observations with the XMM-Newton Observation Lokator