XMM-Newton Twenty-first Announcement of Opportunity (AO-21)
Anticipated Timeline


The Twenty-first Announcement of Opportunity (AO-21) is not yet open

The planned key milestones for the Twenty-first XMM-Newton "Announcement of Opportunity" have been established. Within this AO-21 a new call to submit proposals for observations to be performed with the XMM-Newton observatory will be issued.

To be prepared for this, please find below the anticipated timeline:

The planned key milestones for AO-21 are:
  Announcement of Opportunity 17 August 2021
  Due date for Proposals 8 October 2021 (12:00 UT)
  Final OTAC approved programme mid December 2021
For approved proposals only:
  Start of Phase II proposal submission 10 January 2022
  Closure of Phase II proposal submission 4 February 2022
  Start of AO-21 observations May 2022

The official "Announcement of Opportunity" will be made public in the XMM-Newton News and on the XMM-Newton Science Operations Centre Home Page.