|Chandra Electronic Bulletin No. 10|
******************************************************************************** | | | CCC XX XX OOO | Chandra | CC XX XX OO OO | CXC Electronic | CC XXX OO OO | Number 10 Bulletin | CC XX XX OO OO | January | CCC XX XX OOO | 2002 | | ******************************************************************************** Welcome to the Chandra X-ray Center's Electronic News Bulletin Number 10. CXC Web site: cxc.harvard.edu If you would like to unsubscribe from this alias, simply reply to this message to let us know. Contents: 1. Chandra Cycle 4 NRA Released 2. Observer Notification of Observation Status 3. Bulletin for Proposers ------------------------------------------------------------------------------- Item 1. Chandra Cycle 4 NRA Released ==================================== NASA has released the Chandra Cycle 4 NRA (http://research.hq.nasa.gov/code_s/nra/current/NRA-02-OSS-02/index.html). Proposals are due 15 March 2002 and further information may be found on the CXC website(cxc.harvard.edu). ------------------------------------------------------------------------------- Item 2. Observer Notification of Observation Status ==================================================== Chandra Data Archive used to send at least three E-mail messages to PIs concerning their observation: 1. A notification that telemetry containing the ObsId has been received in Automated Processing (AP). 2. A notification that Quick Look (QL) images are available for the user's inspection. 3. A notification that Verification and Validation (V&V)-approved data products are available for download by the user. The median time between the observation and the notices, during September through November 2001 was, respectively: 1, 2, and 7 days. This system was set up in the early days of the mission when these delays were considerably longer. Because of the minimal delay between the first and second messages, we have discontinued sending the first message, considering it superfluous. - Arnold Rots ------------------------------------------------------------------------------- Item 3. Bulletin for Proposers ============================== ADVICE FOR CONSTRAINED OBSERVATIONS - Observations with time windows, phase windows, roll limits, monitoring requirements, or which require simultaneity with other observatories are designated as constrained by RPS. The Cycle 4 program will be limited to 20% constrained observations. Even with this limit, scheduling has been more difficult than anticipated , particularly for long-duration, constrained observations. It would be helpful if, when there is a real constraint, you could enter the maximum range you will accept. If a finer tolerance is desirable, state this in the "remarks" section. This will give the CXC maximum scheduling flexibility. If your constraint is not mandatory for the science, and you do not wish to compete within the 20% limit, we urge you to request "Preferred" rather than "Yes" for the constraint. Not all preferred constraints can be accommodated, but often we can work a beneficial compromise with you. Note that schedules are often changed for targets of opportunity and by solar-particle events. (During Sept-Oct 2001, 17% of the observing time was lost to high particle-induced backgrounds.) If a constrained observation is bumped, there may be a long delay in rescheduling. ROLL CONSTRAINTS - For a given target and observation date there is only one nominal roll angle (with allowed deviation of a few degrees). For much of the sky, this nominal roll angle changes by about a degree per day. Roll tolerance as small as +/- 10 degrees thus provide little flexibility in scheduling a target; users are encouraged to specify roll tolerances that allow the most scheduling flexibility possible while meeting their science goals." If you are using an offset pointing or a SIM offset to "fine tune" your field of view, note that this will change with roll angle; i.e., will depend on the date of observation. PROPOSAL FORMAT - Please follow the rules set forth in the NRA. Remember that a peer reviewer has to read 60 proposals and brevity is appreciated. If you go over the page limit, we will discard the surplus pages. If you violate the rules for font and margins, we will not accept the proposal. TIMELINESS OF SUBMISSION - Please don't wait until the last minute to discover that RPS is slightly different from last time, that the system is slower than expected because of heavy traffic, etc. The deadline is 7:00 PM EST, 15 March 2002. Late proposals will not be accepted. Don't assume that if RPS is up, it is OK to submit. RPS stays up round-the-clock-year-round to handle TOO requests. PROPOSAL ERRORS - Please check your proposal before submission for errors, particularly the target and instrument parameters. We do search for coordinate errors and each cycle have found about 25 targets with big mistakes - wrong sign for declination, wrong epoch, wrong target (name and coord. don't match), and typos in the numbers. If there is a coordinate error and we don't find it, you will be disappointed with your data. We know of 2 targets that have been missed completely because of typos in the target coordinates. If you are submitting more than one proposal, please check that the science justification matches the target form. It is also a good idea to put the proposal title on the science justification. We can then know that they are matched correctly. If you have submitted and find a substantial error before the deadline, you may resubmit a corrected proposal and we will use your 2nd submission. If it is after the deadline, contact us and we will correct coordinates and instrument parameter errors. We will not add or delete Co-Investigators or make changes to the science justification. Some errors may be described in a letter which we will pass to the peer review (see Section 13.7.2, Proposers Observatory Guide). DOCUMENTED BUT APPARENTLY NOT-WELL-KNOWN ASPECTS OF PROPOSAL SUBMISSION LARGE PROJECTS must be designated as such. If your deep proposal is a Large Project, you should check the appropriate RPS box; otherwise it will be evaluated as a standard proposal. It is permissible to submit, as a standard proposal, one with total time requested above the threshold for being a Large Project. It is possible to submit a science justification with COLOR ILLUSTRATIONS. You must send 20 hardcopies (so the CXC does not have to print them). You must also submit the science justification electronically. When your proposal is evaluated we will add a SLEW TAX of 1500 s to each target. All bookkeeping is still done with observing time but the peer review considers the actual spacecraft time required. This only has a practical effect on proposals which ask for many short observations. This Electronic Bulletin is used for the dissemination of important announcements and information about the Chandra X-Ray Observatory to members of the community. If you wish to unsubscribe from the list, simply reply to this email to let us know.
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