The majority of XMM-Newton's observing time is made available via Announcements of Opportunity, which are open worldwide. In addition to this ``Open Time'', there is ``Calibration Time'', and Project Scientist's ``Discretionary Time''.
This Announcement solicits proposals to be carried out in the
period May 2009 to April 2010.
All available ``Open Time'' of this period is distributed via this
call, which results in 
14,500 ks total observing time.
``Open Time'' observations resulting from this Call for Proposals will
be interleaved into the observing schedule, together with a few
observations which failed or were not performed during the time
period allocated to the previous Announcements of Opportunity.
A few observation approved in this call may be scheduled outside of the
above period, depending on the visibility and science aimed.