FAQ for Multi Cycle Observations
Proposer Threads (Cycle 15)
- What is a Multi-Cycle Observation Proposal (MCOP)?
- RPS form for MCOPs
- Observing Constraints
- XVP proposals and MCOPs
- TOO in MCOPs
- Joint Time in MCOPs
- More Information on MCOPs
Proposers whose science calls for constrained observations over a period longer than one year, may include requests for up to a 3-year time period in a single proposal. This will be useful, for example, for long-term monitoring programs. Proposals must request time in Cycle 15, and justify both the requirement for multi-cycle observations and the allocation of time across the multiple cycles.
A maximum of 2 Msec of Cycle 16 and 1 Msec of Cycle 15 observing time may be allocated to MCOPs in Cycle 15, if scientifically justified and subject to the continued availability of that time.
The proprietary period for data from multi-cycle targets begins when 90% of the data for any given target (as allocated to each cycle) has been made available to the observer.
I am writing a proposal for a multi-cycle observation and I want a target to be observed for 200 ksec in Cycle 15, then again in Cycles 16 and 17 for the same amount of time (for a total of 600ksec). How do I fill up the RPS form?
In the RPS Cover Page the question Is this a multi-cycle observing proposal? should be answered YES (Y).
In the RPS Target Page the total observing time for all cycles combined (600 ksec in this example) should be entered in addition to the projected time for Cycle 16 and Cycle 17 (200 ksec each in this example)
Note that the total observing time will be calculated by the RPS from the individual Target Pages and indicated on the RPS cover page.
If multi-cycle observations are requested for a given target, the proposer must specify the observing constraints that require the observations to extend into future cycles (see following FAQ).
How do I specify the observing contraints in future cycles?
All observing contraints for Cycle 15 and for future cycles should be specified in the Target page in the RPS form.
Multi-cycle observations may not be requested as a preference.
Constraints must be well-justified scientifically in the proposal.
The PI must estimate based on these constraints the amount of time required in Cycle 16 and 17 for each such target, assuming the earliest feasible start date for the first target observations. For accounting purposes, the cycles are defined below:
Cycle 15 from 01-NOV-2013 00:00 through 31-OCT-2014 23:59
Cycle 16 from 01-NOV-2014 00:00 through 31-OCT-2015 23:59
Cycle 17 from 01-NOV-2015 00:00 through 31-OCT-2016 23:59
I am writing an XVP proposal with no specific time constraints for which data can be accumulated over more than one cycle. I would like to exploit MCOPs to minimize the impact of exposure time per cycle. Does such a proposal qualify as a MCOP in Cycle 15?
No it does not.
An XVP proposal can be a MCOPs only if it is time constrained, and the constraint is needed to achieve well defined science goals. MCOPs cannot be defined as such to minimize the impact in terms of exposure time per cycle. That is not a valid reason.
If approved, an XVP might well be scheduled over 2-3 cycles for technical reasons, but this is up to the Chandra mission planners.
I am proposing to observe a variable source and would like to observe it in Cycle 16 only if the flux is brighter than a specified value. Can I propose for a TOO in future cycles?
No, this is not possible. Only Cycle 15 time can be requested with a scientific trigger. Only follow-up observations are allowed in future cycles.
Can I ask for joint (HST/XMM /NOAO/NRAO/Suzaku) time in future cycles?
Yes, up to 10% and 5% of the available joint time in Cycles 16 and 17 respectively may be allocated to multi-cycle observing proposals if scientifically justified and subject to the continued availability of that time (see Section 4.5 of the CfP).