Call for Proposals
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Semester S19B: *August 1, 2019 -- January 31, 2020
*Actual start of S19B will be late September or early October due to the main shutter maintenance.
Subaru Telescope, National Astronomical Observatory of Japan
Subaru Telescope invites observing proposals for Semester S19B. 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 S19B
|Deadline of Normal/Intensive Program Submission
||March 7 (Thu), 2019 12:00 (Noon) in Japan Standard Time
(i.e., March 7, 3:00 am in UT)
|Deadline of Service/Filler Program Submission
||April 4 (Thu), 2019 12:00 (Noon) in Japan Standard Time
(i.e., April 4, 3:00 am in UT)
|Time Allocation Committee
|Notification of selection results
Important Notice for S19B
||Since maintenance work of main shutters is planned in the beginning of S19B, actual start of the semester will
be late September or early October. Downtime schedule will be fixed in March. See "Telescope-Related Topics" for more details.
|IR Secondary Mirror Re-coating
||Re-coating of the IR secondary mirror (IRM2) is planned in 2020 January, and observations using IRM2 (relevant for COMICS, IRCS, IRD, SCExAO, CHARIS, and VAMPIRES) will not be possible for two weeks.
||Because of the upgrade of the laser system, AO188 can be used only with natural guide stars in S19B.
|Status of FOCAS
Although the current performance of FOCAS is considerably degraded
due to the damage caused by hurricane-induced water leak in last August,
its repair is expected to be completed by the beginning of S19B. Integral Field Unit (IFU) will be available
in a shared-risk mode. Please see FOCAS web page for details.
|Status of Visiting Instrument (PI Instrument)
IRD (InfraRed Doppler) will be available for open use in NGS mode, but still in a shared-risk mode. CHARIS (with SCExAO+AO188) as well as VAMPIRES module in SCExAO are offered for open use observations. Visiting instruments may be used in intensive programs if necessary conditions are fulfilled, though only IRD is relevant in S19B.
|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 with the same targets as aimed in SSP is not allowed.
|Decommissioning of COMICS
||Since COMICS will be decommissioned as of S20B, it is available only in S19B and S20A.
|Operation of HSC
||There will be 3–6 observing runs of HSC in S19B allocated to
dark or dark-gray nights (the number of runs in August through October depends on the downtime schedule).
See also "Notice for HSC Applicants"
|Maintenance of Main Shutters
||There will be maximum two months downtime in August – October
for the maintenance work of main shutters, which is for the sake of long-term stable operation.
|Observation w/o the Windscreen throughout S19B
||Due to the incident on April 10, 2017, the windscreen of the Subaru
telescope is out of operation in S19B, and thus tracking accuracy of
the telescope may be degraded at high winds. Since observations may
be interrupted at high winds, it is recommended to prepare backup targets with different azimuth
|Use of HSC
||In S19B, Hyper Suprime-Cam (HSC) will be offered in a shared-risk mode.
HSC proposers 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
Service observations are not available.
|Classical Mode Observation of HSC
Given that the queue mode is the primary mode of HSC observation,
proposers wishing to use the classical observation mode of HSC have to
describe why the classical mode is preferred to the queue mode in
Entry 13.(Scheduling Requirements). Unless any convincing reason,
proposers may be asked if it is possible to change the observation mode
from classical to queue. Note that a proposal requesting to use the NB387 filter
must be submitted as a classical mode program.
|Queue Mode Observation of HSC
||The queue mode is the primary mode of HSC observation. 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.
|Requested Time of Queue Observation in unit of 0.7 Hour
||Requested and minimum telescope time for HSC queue observation 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,
in order for the equivalent night exactly expressible to the first decimal place.
||Filler program are executed only under poor conditions where usual observations are hard to be conducted. From S19A, 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 is not allowed for any HSC
observations during the semester. The dead time ("Sukima" time), when
there is no planned target on the night sky, will be exploited as
effectively as possible depending on the situation (observing
priority: 1. observations of standard stars, 2. queue-mode
observations for Grade A/B programs, 3. observing user's back-up targets, and
4. queue-mode observations for Grade C or Filler program observations).
|Set of HSC Filters
||HSC users must explicitly describe the filters they intend to use in Entry 16
(Instrument Requirements), where the desired set as well as the minimum acceptable set should be clearly specified. If you would like to use the NB400 filter, you must obtain an approval from the filter developer team in advance of the proposal submission.
||We are preparing to offer a new data analysis platform for HSC observers from S19B. The system status including an instruction
of how to apply to the system will be announced to PIs of approved programs.
Notice About Nasmyth/Cassegrain Instruments
|Notice for HDS Applicants
||HDS is often combined with the Subaru
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 will be conducted always 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.
|Dark Nights Essentially Due to HSC
||Since almost all dark nights will be allocated to Hyper Suprime-Cam, 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 S19B for this purpose. Only Japan or Taiwan researchers (i.e., those belonging to institutes in Japan or Taiwan, or those of 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. Regarding institutes which entered an MoU with Subaru/NAOJ, however, the agreement in the MoU will be exceptionally applied.
|ToO Observation in Keck Time
||From S19A, 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 S19B, mutual applications for Subaru Intensive Program as well as for Gemini Large and Long Programs are possible by making use of Subaru–Gemini time exchange program. 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
|Necessity of MOIRCS Preimaging
||MOIRCS/MOS users 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.
|Necessity of FOCAS Preimaging
||FOCAS/MOS users 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.
|Number of MOIRCS/MOS Masks
||MOIRCS/MOS users 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.
|Moon-affected Unacceptable Dates
||When one particular source or several sources whose coordinates are concentrated to a particular sky region are planned to be observed on bright or grey nights, observations may be severely affected by the Moon depending on the situation. In such cases, 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 Suppot
||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.
||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 attain
your science goal, as 2nd choice instrument(s).
|Description of Acceptable Observing Date Range
||Even though your preferred observing dates are rather limited,
you should make your acceptable date range as wide as possible.
Your proposal would be automatically rejected, in case that
we cannot find any observing slot for your program in your
acceptable range (even if your proposal is above the borderline
|"Technical Justification" Entry in Service Proposal form
||From S17A, a new entry (Technical Justification) has been arranged in the application form of the service program, in which technical details (such as integration time and so on) should be explained.
|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).
||In principle, cancelled observation time due to unexpected telescope/instrument failure 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 two or more 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.
||Remote observations from Mitaka Headquarter (remote-M) are allowed for all instruments under the approval of relevant support astronomer.
Meanwhile, remote observations conducted from Hilo Base Facility
(remote-H) may be allowed for IRCS (NGS mode only), HDS, HSC, and MOIRCS (for experienced observers). Those who wish to perform the observations remotely should check the box in Entry 13 (Scheduling Requirements), though such a request may not necessarily be granted, depending on the instrument status and/or scheduling limitations.
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