The XVP Program:
Given the reduction in observing time available in this and future
cycles due to the expected evolution of Chandra's orbit, the 5.5 Ms
of time to be allocated to XVP programs this cycle will be drawn
from Cycles 16 and 17. There will be no XVP call included in Cycle
17. The next XVP call will depend on a review of the available
observing time in advance of Cycle 18. See Section 4.3 of
the CfP for more information.
New Joint Program:
The NuSTAR project is making available up to 500 ksec of NuSTAR
observing time to joint science proposals. Refer to Section 4.5 of
the CfP for details.
The RPS proposal Cover Page now requires at least three keywords
describing proposal science. Selected keywords may be used to
facilitate preliminary matching of proposals to reviewers, as well
as archive searches. See Section 5.2.2. of the CfP.
ACIS Optional CCDs:
The CXC now encourages observers to specify a total of 4 or fewer ACIS
CCDs as required (i.e., "Y" in the RPS form). Additional optional
CCDs may be selected (as "Off#" in the RPS form, where e.g., "Off1"
specifies which CCD should be turned off first if the satellite
thermal state is unfavorable). Up to five CCDs may be specified as
"required". Those requesting 6 CCDs must specify at least one
optional CCD at the time of proposal submission. Details can be
Also refer to "Choosing Optional CCDs" in section 6.20 of the POG
for more information.