Call for Proposals

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Semester S20A: February 1, 2020 -- July 31, 2020

Subaru Telescope, National Astronomical Observatory of Japan

Subaru Telescope invites observing proposals for Semester S20A. 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 How to Submit via webform, Open Use Policy and Telescope webpage.

Open Use Schedule for S20A

Deadline of Normal/Intensive Program Submission September 5 (Thu), 2019 12:00 (Noon) in Japan Standard Time (i.e., September 5, 3:00 am in UT)
Deadline of Service/Filler Program Submission October 3 (Thu), 2019 12:00 (Noon) in Japan Standard Time (i.e., October 3, 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 S20A

Possible Telescope Downtime Due to unpredictable situation occurred at Maunakea, the renovation work of main shutters, which is originally scheduled in this summer, may be postponed to S20A or S20B period. In this case, telescope downtime would be assigned sometime in S20A.
Maintenance Work of TUE Upgrade work of top unit exchanger (TUE) controlling system will be conducted from May 29 through middle August. Though there will be no telescope downtime, HSC and FOCAS cannot be used during this period because IR secondary will be mounted.
Re-coating of IR-Tertiary Mirror Re-coating work of IR Tertiary Mirror is scheduled in April, 2020. IR instruments (IRCS, IRD, SCExAO, CHARIS, and VAMPIRES) cannot be used for about two weeks in April. This work may be swapped with IR secondary mirror re-coating work which is planned in November 2019 due to the situation of Maunakea.
Only NGS mode Available for AO188 in S20A Our laser system is currently under the upgrading process, and therefore only NGS mode is available for AO188 in S20A. Please check the AO188 webpage for the latest information.
Notice for MOIRCS Applicants There is a possibility that MOIRCS will hibernate from S20B for a few years if SWIMS will start the science operation at Subaru. Please visit the MOIRCS website for more details.
The R1300 and/or the VPH-Y grisms may be unavailable during S20A. If these grisms are essential for your S20A proposal, please contact the primary SA by the deadline, September 5, Noon, in JST.
Status of Visiting Instrument (PI Instrument) IRD is available for open use, but still in a shared-risk mode. CHARIS (with SCExAO+AO188) as well as VAMPIRES module in SCExAO are offered for open use observations. IRD can be used for intensive programs, but other visiting instruments do not accept intensive programs.
Notice for IRD Observation IRD SSP has been started from S19A. Any proposal using IRD should clarify how its scientific aim is different from that of SSP, because doing similar science as aimed in SSP is not allowed. The SSP target list will not be open to the public, so please consult the IRD team well before submitting your proposal.
Decommissioning of COMICS Since COMICS will be decommissioned at the end of July 2020, S20A is the last chance to observe with COMICS.
Operation of HSC There will be 4 observing runs of HSC from February to May in S20A. HSC is NOT available in June and July due to the maintenance work of the TUE. See also "Notice for HSC Applicants" section below.
Remote Observation Subaru Telescope recommends observers from Japan to perform their observations remotely from Mitaka Headquarter. Remote observations conducted from Hilo Base Facility may be allowed for all instruments under the approval of relevant support astronomer.

Telescope-Related Topics

Observation w/o the Windscreen throughout S20A Due to the incident on April 10, 2017, the windscreen of the Subaru telescope is out of operation in S20A, 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.

Notice for HSC Applicants

Observations for HSC-SSP fields HSC applicants requesting to observe the same fields as targeted in the HSC SSP (Subaru Strategic Program) are obliged to clarify the reason for doing so (e.g., how the scientific aim is different from that of SSP).
No HSC Service Programs Service observations are not available for HSC.
Default Observation Mode HSC queue mode is default observing mode for the Normal, Intensive, and Filler programs. Applicants wishing a classical mode observation with HSC have to describe why the classical mode is preferred to the queue mode in "Scheduling Requirements" section of the application form. Without any convincing reason, the observation mode may be changed from classical to queue.
Narrow-Band Observation in Shorter Wavelength Range A proposal using narrow-band filters with central wavelength shorter than 400 nm should be submitted in classical mode, and will not be accepted in queue mode (currently, this only applies to the NB387 filter). In case of proposals using both broad-band and narrow-band filters, once it turned out impossible to execute a narrow-band Observation Block (OB) due to filter scheduling, the priority of the corresponding broad-band OBs will be lowered. Please read the queue mode webpage.
Seeing and Transparency of Queue Mode Seeing and transparency conditions have to be chosen from specific values (Tolerance factors won't be applied anymore). Seeing must be one of 0.8, 1.0, 1.3, 1.6, and 100, and transparency must be one of 0.7, 0.4, 0.1, and 0.
Requested Time of Queue Observation in unit of 0.7 Hour Requested and minimum telescope time for HSC queue observation (except for filler program) should be "multiple" of 0.7 hour (= 0.1 night; because of our transformation rule of 1 night = 7 hours) such as like 2.8 hours or 10.5 hours.
Filler Program Filler programs are executed only under poor conditions. Up to 35 hours can be requested by a filler proposal. Please refer to the filler page.
"No-Additional-Target" Policy for HSC Requesting additional targets for filling dead time ("Sukima" time), when there is no planned target on the night sky, is not allowed for any HSC observations. "Skima" time will be exploited as effective as possible depending on the situation (observing priority: 1. observations of standard stars, 2. queue-mode observations for Grade A/B programs, 3. observing applicant's back-up targets, and 4. queue-mode observations for Grade C and F [Filler]).
Set of HSC Filters HSC applicants must explicitly describe the filters they intend to use in the "Instrument Requirements" section of the application form, where the desired set as well as the minimum acceptable set should be clearly specified. If you would like to use the NB400 or NB430 filter (newly opened from S20A), you must obtain an approval from filter developer team in advance of the proposal submission.

Notice About Nasmyth/Cassegrain Instruments

FOCAS Service Observation FOCAS IFU mode is newly available in service programs. Available grism list for service program is also updated. Please refer to the service program webpage for more details.
Necessity of FOCAS Preimaging FOCAS/MOS applicants are required to describe explicitly about the pre-imaging observation with FOCAS in Entry 16 (Instrument Requirements) if it is necessary for their MOS mask design. Please check the instrument web page for details.
HDS Observations HDS is often combined with the infrared secondary mirror (with which throughput at <3800Å is considerably deteriorated), in order to accommodate as many HDS programs as possible. So, if blue or UV regions are crucially needed for your observation, it should be explicitly described in Entry 16 (Instrument Requirements).
IRCS Observations IRCS observations will always be conducted in combination with AO188 optics, regardless of the use of AO correction. Polarimetry mode of IRCS+AO188 is partially opened for open use in a shared-risk mode. The available modes are Y-, J-, H-, K-, and L-band imaging polarimetry and zJH, HK, and L-band spectropolarimetry modes. Please see the "Polarimetry" section of IRCS page for more detailed information. Grism and Echelle spectroscopy modes (along with imaging) of IRCS+AO188 are available in service programs. Targets of any spectroscopic modes for service programs must have suitable NGS, or TTGS. Please see the Service program page for more detailed information.
Necessity of MOIRCS Preimaging MOIRCS/MOS applicants who need to take pre-images with MOIRCS should explicitly request it in the "Technical Justification" of the proposal. Please check the instrument web page for more details.
Number of MOIRCS/MOS Masks MOIRCS/MOS applicants must explicitly describe the required number of masks in Entry 16, where the desired number as well as the minimum acceptable number should be clearly specified.
Allocation of Dark Nights Since almost all dark nights will be allocated to HSC, using dark nights with other instruments would be hardly possible.

Notice About Time-Exchange Programs

Time Exchange Programs with Gemini and Keck According to the inter-observatory time-exchange agreement, we accept proposals of observations with Gemini (North & South) and Keck telescopes, which will be screened by Subaru TAC within the framework of Subaru Call for Proposals. Maximum several nights (for each of Keck I and Keck II) and minimum 5 nights (Gemini) are available in S20A for this purpose. Only Japan or Taiwan researchers (i.e., those belonging to institutes in Japan or Taiwan, or those with Japanese nationality) are eligible for these Subaru->Gemini and Subaru->Keck time exchange programs.
Please refer to Subaru/Gemini Time Exchange page and Subaru/Keck Time Exchange page for more details.
Application from Gemini/Keck Community Non-Japanese PIs who wish to use the Subaru Telescope and have access to Gemini or Keck telescope time must apply through the time-exchange program provided by Gemini or Keck (see the next row). Regarding institutes which entered an MoU with Subaru/NAOJ, however, the agreement in the MoU will be exceptionally applied.
HSC Filler Program available Regarding filler programs, there is no restriction for researchers from Gemini or Keck community. Please directly submit your filler proposal via Subaru proposal system (PROMS). For more details, please see the filler page. Please note service program is not opened to Gemini or Keck community.
ToO Observation in Keck Time Keck users can trigger ToO observation during the Subaru time in Keck, whereas Subaru users likewise during the Keck time in Subaru. Compensation will be done according to the policy of each observatory.
Gemini LLP and Subaru IP In S20A, mutual applications for Subaru Intensive Program as well as for Gemini Large and Long Programs are not possible. These programs can be applied only in semester B (i.e. once a year).
Gemini Fast Turnaround Program Subaru Community can apply for Gemini Fast Turnaround Programs, in which up to 5 nights per semester are available for researchers belonging to Subaru Community. Their submission deadlines are irrelevant to those of the ordinary Call for Proposals.

Required Clarification in Proposals

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. Those inconvenient or unacceptable dates should be explicitly indicated in Entry 13 (Scheduling Requirements).
Service Program Similar to Normal Program Service Program applicants are required to clarify whether they have submitted similar Normal/Intensive Program proposals for this semester.
Target Check in Subaru Archive Data Applicants are required to check their targets in SMOKA database (Public Data Archive) before submission. If the objects have already been observed by Subaru in the past, the reason why they need to be observed again must be described.

Reminder About Basic Rules

Policy of Travel Support Due to the severely tight budget, NAOJ's support of travel expense to Hawaii is limited to only one Japanese observer for each observing run, though up to three Japanese researchers may still be supported including remote observers from Japan/Mitaka.
Revised Science Categories The science categories to be selected by applicants for each proposal have been partly reorganized and renamed since S18B. See here for more details.
Intensive Program The size of Intensive Program has been expanded up to 40 nights over maximum 6 consecutive semesters (with maximum 20 nights in a semester). We accept Intensive Program using HSC queue mode.
Proposals for Unspecified Targets Proposals in which targets are not specified at the time of proposal submission may be submitted to Normal Program, but not to Service Program.
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).
Abstracts of Accepted Proposals Will Be Opened The complete texts of the abstracts of all the accepted Subaru proposals will be open to the public at the same time of the data release (i.e., when the proprietary period of 18 months has expired).
Unexpected Cancellation In principle, canceled observation time due to unexpected problem such as telescope/instrument failure or natural disaster will not be compensated.
Using Visiting Instruments Any proposal using visiting instruments must include the relevant instrument PI as a Co-investigator.
Duplicated Submission Unallowable An identical proposal of the same science and targets using the same instrument and telescope should not be submitted twice 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).
One Proposal for One Project Even if you intend to carry out observations by using different Subaru instruments (or even by using different telescopes, such as Subaru+Keck or Subaru+Gemini) for the same scientific project(s), you must describe them only in "one" proposal, because separate submission of multiple proposals belonging to the same project brings about considerable confusion. You can specify several different instruments in Entry 12 (Observing Run) and describe your detailed observing plan of how to use them in Entry 16 (Instrument Requirements) or Entry 15 (Observing Method and Technical Details). Especially, if you want to use two telescopes (Subaru+Gemini or Subaru+Keck) for the same project(s), please summarize your plan in one proposal and select the relevant option in the webform.
Time Allocation Basically One-night Unit Telescope time allocation (except for queue observations) is basically made in unit of one night, though half night allocation may be exceptionally possible, if a suitable program could be found for the other half night.

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