Call for Proposals

Semester S21A: February 1, 2021 -- July 31, 2021

Subaru Telescope, National Astronomical Observatory of Japan

Subaru Telescope invites observing proposals for Semester S21A. Since each instrument has its own specific restrictions/conditions, applicants are required to consult the relevant instrument page when preparing their proposals. Please also refer to Proposals, How to Submit via webform, Open Use Policy and Telescope webpage.

Open Use Schedule for S21A

Deadline of Normal/Intensive Program Submission September 8 (Tue), 2020 12:00 (Noon) in Japan Standard Time (i.e., September 8, 3:00 am in UT)
Deadline of Service/Filler Program Submission October 6 (Tue), 2020 12:00 (Noon) in Japan Standard Time(i.e., October 6, 3:00 am in UT)
Time Allocation Committee late October
Notification of selection results early December


Webform the ProMS 2.0 page Instructions How to Submit via webform?

Other instructions

Instructions Open Use Policy, and each instrument page

Important Notice for S21A

Telescope Downtime In S21A, there will be about 34 nights downtime in total. The new laser installation is planned from February 1 through February 3. PFS installation work will be scheduled for 10 days in June. UPS replacement will be made from July 18 to mid of August. The functional renewal of the telescope system controller (TSC) will occur sporadically over seven nights.
Maintenance Work of TUE Top unit exchanger (TUE) maintenance will be conducted between the end of March and middle of May in 2021. Though there will be no telescope downtime, the availability of HSC will be limited by this work. Please refer to HSC webpage for further information.
Changes in HSC Queue Application Requested telescope time for HSC queue observation (except for filler program) should be "multiple" of 1 hour which is equivalent to 0.1 night according to the observatory's policy of 10 hours per night. The requested time must include various overheads, which can be calculated using HSC overhead and required time calculator.
Only NGS Mode Available for AO188 Our laser system is currently under the upgrading process, and therefore only NGS mode is available for AO188 in S21A. Please check the AO188 webpage for the latest information.
Status of Visiting Instrument (PI Instrument) Following instruments/module are offered for openuse in S21A:
- IRD (in a shared-risk mode)
- REACH (combination of SCExAO and IRD for single-mode fiber spectroscopy)
- CHARIS (with SCExAO+AO188), including spectro-polarimetric mode
- VAMPIRES module in SCExAO
- SWIMS (in a shared-risk mode)
Proposals to use visiting instruments must include the instrument PI as a Co-investigator. IRD can be used for intensive programs, but other visiting instruments are unavailable for intensive programs.
SWIMS or MOIRCS Operation in S21A SWIMS is planned to be opened from S21A to S22B as a substitute for MOIRCS, though the final decision will be made in October 2020. If SWIMS is unavailable in S21A, we will consider operating MOIRCS instead (depending on the demands for MOIRCS as a backup instrument). SWIMS applicants can request MOIRCS as a backup instrument by clearly specifying the backup plan using MOIRCS in the proposal (15. observing method and technical details section). Note that the scientific goal and observing method of the backup plan must be same as those of the main proposal. Also note that the 'MOIRCS-only' proposal is not accepted.
Observation w/o the Windscreen The windscreen of the Subaru telescope is continuously out of operation in S21A, and thus tracking accuracy of the telescope may be degraded by high winds. Since observations may be interrupted by high winds, it is recommended to prepare backup targets with different azimuth angles.

Reminder About Basic Rules

Moon-affected Unacceptable Dates If the Moon is close to the target, the observation could be severely affected by the Moon light and such condition should be avoided. Applicants are responsible to avoid such condition to occur by specifying the inconvenient/unacceptable dates in Hawaii Standard Time. Those inconvenient or unacceptable dates should be explicitly indicated in Entry 13 (Scheduling Requirements).
2nd Choice Instruments If your science goal could (fully or partly) be achieved by other instruments (of Subaru/Keck/Gemini) instead of your 1st choice instrument, we recommend you to describe such alternative instruments, which may be usable/acceptable to achieve your science goal, as 2nd choice instrument(s). If you choose a PI-Type instrument as a 2nd choice instrument, you need to get approval from the PI of PI-Type instrument.
Duplicated Submission Unallowable An identical proposal of the same science and targets using the same instrument and telescope should not be submitted at the same time through different TAC processes. For example, if a proposal using Keck or Gemini was once submitted to Subaru time-exchange program, it should not be applied to the ordinary proposal selection on Keck or Gemini side at the same semester (and vice versa).

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updated on August 5, 2020