If a science project requires observations with both Chandra, sponsored by the U.S. National Aeronautics and Space Administration, and the XMM-Newton Observatory, then a single proposal may be submitted to request time on both observatories to the XMM-Newton Announcement of Opportunity, so that it is unnecessary to submit proposals to two separate reviews.
By agreement with the Chandra Project, the XMM-Newton Project
may award up to 400 ks of Chandra observing time.
Similarly, the Chandra Project may award up to 400 ks of
XMM-Newton time.
The time will be awarded only for highly ranked proposals that require
use of both observatories and shall not apply to usage of archival data.
The only criterion above and beyond the usual review criteria is that
both sets of data are required to meet the primary science goals.
Proposers should take special care in justifying both the scientific
and technical reasons for requesting observing time on both missions.
It is not essential that the project require simultaneous XMM-Newton
and Chandra observations.
No Targets of Opportunity, either pre-planned or unanticipated, will be
considered for this cooperative program.
For this solicitation, no Chandra time will be allocated without the
need for XMM-Newton time to complete the proposed investigation.
Establishing technical feasibility is the responsibility of the
PI, who should review the XMM-Newton and Chandra documentation
(http://cxc.harvard.edu/proposer/PO G/index.html) or consult with
the Chandra Guest Observer Facility (http://cxc.har vard.edu/helpdesk/).
For proposals that are approved, both projects will perform detailed
feasibility checks.
Both projects reserve the right to reject any approved observation that
is in conflict with safety or mission assurance priorities or schedule
constraints, or is otherwise deemed to be non-feasible.
Note that simultaneous longer-duration observations with XMM-Newton
that require Chandra satellite pitch angles that violate restrictions
may not be feasible.
Any observation(s) deemed to be not performable as indicated above would
cause revocation of observations on both facilities.
Scientists can apply for joint XMM-Newton/Chandra programme time by
selecting the proposal type ``XMM-Newton/Chandra''.
The ``Remarks'' field, which is offered in the RPS should be used to
briefly describe the instrument modes and observing time requests
for Chandra.