Gemini Observatory invites its community to propose scientific investigations for the 2023B semester, 1 August 2023 - 31 January 2024.
The table below shows submission deadlines for all Gemini Participants, and the Subaru community under the Gemini/Subaru time exchange. Multi-participant joint proposals should be submitted by the deadline of the participant country to which the Principal Investigator is affiliated. For more on the Gemini proposal submission and time allocation process, please consult the Phase I page.
|United States||March 31, 2023 at 23:59 (Mountain Standard Time)|
|Canada||March 31, 2023 at 16:00 (Pacific Daylight Time)|
|Brazil||April 03, 2023 at 23:59 (Brazilian Time)|
|Argentina||March 31, 2023 at 17:00 (Argentina Time)|
|Korea||April 03, 2023 at 23:59 (Korea Standard Time)|
|Chile||March 31, 2023 at 23:59 (Civil Chile Time)|
|Univ. of Hawaii||April 03, 2023 at 10:00 (Hawaii-Aleutian Standard Time)|
|Subaru Community||March 31, 2023 at 23:59 (Hawaii-Aleutian Standard Time)|
|French Community||April 01, 2023 at 23:59 (Hawaii-Aleutian Standard Time)|
The Call is open to all participants and host institutions: Argentina, Brazil, Canada, Korea, the United States, Chile and the University of Hawaii. US time is open to all astronomers worldwide including those at non-US institutions, although in that case the proposal must explain why U.S. national facilities are needed.
Time Available in 2023B
A summary of the time distribution at each telescope is shown in the Table below. More information is available at the time distribution page. At Gemini North, 162 nights are expected to be available for science. At Gemini South, 141 nights are expected to be available for science.
|Participant/Type||North hours||South hours||Notes||Participant/Type||North hours||South hours||Notes|
|US||664||497||US open skies policy allows PIs from any country to apply.||Director's Discretionary||81||66||Open to any astronomer.|
|Canada||206||151||Includes GRACES compensatory time.||Fast Turnaround||143||116*||Open to PIs from US, CA, AR, BR, KR, UH (North only). Not open to CL.*|
|Argentina||24||20||Large and Long**||138||175||Open to PIs from US and CA.|
|Brazil||75||61||France||9||9||GRACES compensatory time.|
|Korea||85||69||Guaranteed Time||38||114||For the MAROON-X, IGRINS and (provisionally) GHOST instrument teams.|
|Univ. of Hawaii (host)||157||Includes GRACES compensatory time.||Engineering||220||430||Includes re-coating of the Gemini South primary mirror.|
** US time reserved for LLP includes other US long-term programs.
New and Notable in 2023B
The following capabilities and announcements are notable for the 2023B semester. Please see the relevant instrument pages and subsections of the call for proposals for details.
Summary of 2023B Gemini Capabilities
Targets are generally limited to 17 < RA hours < 13.5 and -37 < DEC degrees < +90. The telescope is expected to not be available between October 30 and November 3, 2023, for maintenance of the Acquisition and Guider unit. There are additional constraints as described in the target accessibility and instrument restrictions page.
Facility instruments offered in 2023B are:
Visiting instruments offered in 2023B are:
Targets are generally limited to 16 < RA hours < 12 and -90° < dec < +28°. Due to the shutdown (September 25 - October 24), the time available at RAs between 20 hours and 6 hours will be reduced by 20% to 30% and so investigators with targets in this range are advised to have alternative targets available. There are additional constraints as described in the target accessibility and instrument restrictions page.
Facility instruments offered in 2023B are:
Visiting instruments offered in 2023B (subject to demand) are:
Important Dates for 2023B
The deadline for Phase I submission varies with participant (see the submission deadline Table at the top of this CfP). For successful proposals, both queue and classical, the Phase II submission deadline is 19th July 2023. Check the 2023B schedule for key dates and events in the proposal process.
Phase I Submission Guidelines for 2023B
Proposals for time on Gemini, and for time on Subaru via the Gemini-Subaru time exchange program, must use the Gemini Phase I Tool (PIT). Latex and Word templates are available to create pdf attachments which include the science and technical cases, and investigator information. The template has been revised to enable the anonymous review process, and to make proposals requirements uniform across the partners. Two attachments are required for the proposal so that team information can be separated from the science case.
All Gemini proposals requesting time from the US, CA, BR, or AR must be anonymized. Proposals which do not meet the guidelines will be penalised. This applies to proposals requesting time only from these partners, as well as joint proposals requesting time from multiple participants which include any of these partners. This requirement applies whether it is the PI or a co-I that has the relevant partner affiliation.
Additional options in the Time Requests module in the PIT are available for semester 2023B:
- The Gemini 2023B Phase 1 Tool includes options to specify that the proposal is for the Aeon multi-telescope-facility system.
- Also in the 2023B Time Requests module, there is an option to identify proposals which have synergies with James Webb Space Telescope science. The goal for providing this proposal category is to encourage development of science programs that benefit from a combination of Gemini and JWST observations. More information is available here.
Time for baseline partner calibrations is automatically added to the total time requested for each target in the PIT. Investigators should continue to include the time associated to overheads (acquisition time, readout time, etc) in the total time estimated for each target in the PIT. The ITC output now gives overhead estimates. Alopeke and Zorro PIs should include program time for PSF standards if they need them. See the IGRINS at Gemini page for information on how to determine exposure times for that instrument. PIs with targets that can be observed from either Gemini North or South (e.g. equatorial targets to be observed with one of the GMOS instruments) can request time with both instruments, in that case the time with each instrument should be halved, and the Observatory will update the observation times when targets are scheduled.
Targets of opportunity proposals must include all instrument configurations which the team may want to use, at Phase 1. This enables automatic creation of templates, and avoids errors at Phase 2.
Subaru Exchange Time
The exchange of time between the Gemini and Subaru communities will continue in 2023B; around 5 nights are expected to be available on Subaru for the Gemini community via the exchange program. A summary of the Subaru capabilities in 2023B is given below, PIs should also consult the Subaru Call for Proposals.
In addition, the Gemini community can propose shorter programs for Subaru's Service mode. PIs must indicate on the proposal whether regular or service time is requested. Service programs must be short programs of less than 4 hours duration including calibration and overheads, using one of IRCS, HDS, FOCAS or MOIRCS (imaging). Around 1 night is expected to be available in this mode for the Gemini community. Prospective investigators must carefully review the Service Program web page. In particular, some additional, detailed technical informationn must be provided at the time of Phase-1 submission. Service proposals are reviewed by the National TACs together with the regular proposals.
Facility instruments offered in 2023B:
Visiting instruments offered in 2023B, are listed below. Proposals to use visiting instruments must include the instrument PIs as Co-investigators.
Other Proposal Opportunities in 2023B
Other proposal opportunities are available at Gemini Observatory in 2023B. These include:
- The Large And Long Program (LLP) 2023 Call provides an annual opportunity to submit proposals which require either significantly more time than a partner typically approves for a single program, or extends over two to six semesters, or both. Up to 20% of the available time from participating parters (US and Canada) is available for LLPs. LLP proposals are currently being accepted from PIs based at an institution of one of the participating partner countries and who have submitted a letter of intent by the appropriate deadline. The 2023B LLPs proposal submission deadline is March 31, 2023, at 23:59 (Hawaii-Aleutian Standard Time). Further information on LLPs and the LLP proposal process can be found on the Large And Long Programs page. Information on previously accepted LLPs and their science programs is available here.
- The Fast Turnaround (FT) Program provides monthly opportunities to submit proposals, with successful programs scheduled for observation starting one month after each proposal deadline. Up to 10% of the time at Gemini North and Gemini South is available for the FT programs. PIs must be members of the Argentina, Brazil, Canada, Korea, University of Hawaii or United States astronomy communities. Chile has withdrawn from the FT program and therefore Chilean PIs do not have access to FT time. At Gemini South, it is currently planned to use the FT time in the second half of the 23B semester for a dedicated GHOST-only Special Call. Chile will contribute time for this special call. More information will be provided on the FT web pages nearer that time.
- Director's Discretionary Time is open to any astronomer worldwide and proposals can be submitted at any time.
- Poor Weather Proposals are solicited for programs that can use poor, but usable, conditions and are executed when nothing in the regular queue is observable. Proposals can be submitted via the normal TAC process (this call) or at any time. PIs must be based in Gemini participating countries or the host institutions.
- The Gemini community is eligible to propose HyperSuprimeCam (HSC) filler programs on Subaru. Filler programs are executed in poor observing conditions (typically seeing >1.5 arcseconds, and/or poor transparency), and up to 50 hours can be requested by a filler proposal, although the first 4 hours have priority. Execution is not guaranteed: observations are made only when there is no other program in the HSC queue. Proposals must be sent through the Subaru submission system (NOT Gemini), and are considered only by the Subaru TAC. Note that only a short text summary of the program is required, not a full detailed Science Justification.
Data Rights, Proprietary Periods and Data Distribution
All data taken with the Gemini telescopes are the property of the Gemini Observatory. Principal investigators of Gemini regular programs (Queue/Classical/Poor Weather) have exclusive access to the data for their program for a period of 12 months. Data acquired as part of a Director's Discretionary (DD) program have a standard proprietary period of 6 months, however in exceptional circumstances the Observatory may remove DD proprietary periods. See the page Data Rights and Proprietary Periods for more information.
All data, including raw and available processed data, obtained with the Gemini telescope are distributed exclusively through the Gemini Observatory Archive. More information about the data distribution is given here.
Supporting Information for the Call for Proposals
Relevant general information related to the applications for time on Gemini Telescopes is presented in the supporting information page. Consult there for the following:
- Time Allocation Process (National and International Time Allocation Committees)
- Submitting for time on both telescopes
- Band 1 Persistence
- Electronic PIT Submission
- Joint Proposals
- Under-utilized Instruments
- Targets of Opportunity
- GMOS Mask definitions
- Poor Weather Programs
- Exchange Time
- Target information (guide stars, non-sidereal objects, time-specific observations)
- Duplicate Observations
Prospective users should also refer to the target and instrument accessibility page, and the instrument pages for detailed and up to date information on instrumentation.
Questions and Answers
All questions concerning proposals, or any other subject, should be made using the Gemini HelpDesk. The system will send the request to your National Gemini Office staff in the first instance who will escalate it to Gemini staff if necessary.
Comments and suggestions on the format and content of this page and supporting pages are welcome, and should be sent to Mark Rawlings.