Subaru Open Use Policy

1. Three Types of Open Use Program

Three kinds of Open Use programs are available, depending on the requested telescope time:

Normal Program
Normal Program is for observing proposals which require less than or equal to 5 nights within a semester. Applicants who apply to Normal Program should follow the instructions at How to Submit?.

Intensive Program
Intensive Program is for observing proposals requiring more than 5 nights (up to 20 nights) within a semester. Besides, applicants can request maximum 40 nights over several semesters (6 consecutive semesters at maximum). Applicants who apply for Intensive Program should follow the specific instructions at the intensive program webpage as well as How to Submit?.

Service Program
Service Program provides an opportunity to effectively execute short programs that do not require a full night of observing time to achieve good scientific results. Each Service Program must be completed within 4 hours, including all the required "open-dome" calibrations and overheads. Proposals intending to observe indefinite (i.e., unspecific) targets should not be applied for Service Program.

All Service Program observations will be executed by the Support Astronomers. The observing method and technical details must be well described in the proposal. Applicants of Service Program should follow the specific instructions at the service program webpage as well as How to Submit?.

Appendix: Filler Program
Filler program (special category of HSC queue mode observation) is executed only under very poor conditions where usual observations (e.g., those of normal/intensive programs) are not practicable. Up to 35 hours can be requested by a filler program proposal. Please see the filler page for more details.

Appendix: ToO Proposals
Applicants may submit proposals for Target of Opportunity (ToO) observations of transient and/or rare phenomena with specific or unspecific objects based on clear observational strategy, such as nearby supernovae, Gamma-Ray Burst follow-up, etc. Proposals should be submitted in the same manner as Normal Program proposals, while clarifying which Subaru instruments can be used to perform the ToO observations and how much time will be required. In addition, all ToO proposals must include at least one member of Subaru Telescope (Hawaii) staff as Co-I.

Japanese astronomers may also submit ToO proposals to the time-exchange program with Gemini, which will be executed at queue mode. Please refer to Subaru/Gemini page for more details.

2. Semesters

Subaru Telescope calls for proposals from astronomical researchers twice a year, which we call Semester A and Semester B (see the time table below). The submission deadline of Service/Filler Program is about one month later than that that of Normal/Intensive Program. Please pay attention to the specific deadline date for each semester which is announced in Call for Proposals.

A semester B semester
Opening of Call for Proposals early/mid August early/mid February
Normal/Intensive Program Deadline early/mid September early/mid March
Service/Filler Program Deadline early/mid October early/mid April
Refereeing October April
Time Allocation Committee late October/early November late April/early May
Scheduling November May
Notification of the Selection Result early December early June
Start of the Semester February 1 August 1

3. Instruments

The following facility instruments are available for Subaru Open Use (as of S20A).

Please read our instrument webpage carefully before your submission. If you have any question about the instruments, please ask the relevant Support Astronomers listed below:
  • COMICS: Dr. Takuya Fujiyoshi
  • FOCAS: Dr. Kentaro Aoki
  • HDS: Dr. Akito Tajitsu
  • HSC: Dr. Tsuyoshi Terai
  • IRCS: Dr. Yuhei Takagi
  • MOIRCS: Dr. Ichi Tanaka
  • AO188: Dr. Etsuko Mieda

Those who intend to use the visiting instruments for Subaru Open Use must include the relevant instrument PI as a Co-investigator. The correspondence address for the PI is as follows:

  • CHARIS: Dr. Jeremy SCExAO: Dr. Guyon
  • IRD: Dr. Takayuki

Applicants can also submit proposals using carry-in instruments of their own. However, those who intend to use such specific instruments are required to make contact with the Director of the Subaru Observatory in advance as early as possible. Any "carry-in instrument" proposals without going through such a procedure (notification or negotiation beforehand) can not be accepted.

The latest information on the telescope performance can be found at the Telescope webpage. If you have any question related to the telescope, please contact Dr. Kazuhito

4. Criteria for Evaluation of Proposals

Subaru Time Allocation Committee decides which proposals to accept, while consulting reviewers' assessments; e.g., in terms of the following criteria.

  • Scientific importance/Originality
  • Clarity of scientific justification
  • Feasibility to achieve the proposed goal
  • Use of telescope capability

Members of the Time Allocation Committee

Chair: TBD
Members: Akio Inoue (Waseda University, High-z Galaxies)
Toru Misawa (Shinshu University, AGN and Galaxies)
Kentaro Motohara (University of Tokyo, High-z Galaxies, General)
Takanori Sasaki (Kyoto University, Solar System)
Takahiro Sumi (Osaka University, Extrasolar Planets)
Michihiro Takami (ASIAA, Star/Planet Formation and ISM)
Yoichi Tamura (Nagoya University, High-z Galaxies)
Sakurako Okamoto (NAOJ, Nearby Galaxies)
Nozomu Tominaga(Konan University, Compact Object)
Toshiya Ueta (Denver University, Stars)
Hidenobu Yajima (University of Tsukuba, Structure Formation and Cosmology)

5. Allocation policy

About 65% of total nights will be assigned to Open Use Proposals. Although Subaru Telescope is entirely funded by the Japanese government, we also invite proposals from the international community. Maximum 5% of total nights will be allocated to such international proposals (see [note 1]). In any case, non-Japanese researchers are encouraged to submit their proposals in collaboration with Japanese researchers.
[note 1] International proposals are defined as those submitted by non-Japanese principal investigators (PIs) belonging to non-Japanese institutions. However, according to the MoU, researchers belonging to Princeton University or Taiwan are exceptionally allowed to use Subaru up to 10% of the total nights.

Instrument exchanges are not permitted within a night. While observing time will in principle be awarded in units of 1 (whole) night for Normal Programs, you may request an allocation of half nights (i.e., in units of 0.5 night) if it is really sufficient for your intended purpose. It should be realized, however, that you might have some disadvantage in this case, because of the difficulties involved in scheduling half-night programs (i.e., we have to find another complementary program that fills in the other half-night).

6. ToO policy

The Director may override scheduled observations to execute ToO (Target of Opportunity) observations, in case of particularly important celestial events. The telescope time of regular observers lost by its break-in of ToO observations will be compensated by the observatory.

7. Restrictions

An identical proposal of the same science/targets using the same instrument/telescope should not be submitted twice at the same time through different TAC processes. For example, if a proposal using Keck/Gemini was once submitted to Subaru time-exchange program, it should not be applied to the ordinary proposal selection on Keck/Gemini side at the same semester (and vice versa).

8. Data Rights and Archiving

Observers of Subaru Telescope will have exclusive access to their data for a period of 18 months from the time of observation, after which the data will be made open to the public in the Subaru archival database.

9. Publication

After you have achieved intended scientific goals with the data obtained with Subaru Telescope, we encourage you to publish your results as scientific papers. Please refer to our publication webpage for details.

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