CALL FOR PROPOSALS FOR GEMINI OBSERVATORY 2025 LARGE AND LONG PROGRAM TIME |
Important Restrictions for 2025 LLP Proposals:
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Important Dates
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The estimated time available for new Gemini LLPs is provided in the table below. The numbers in the Table are estimates only, the exact time available will depend on instrument commissioning, engineering, campaign science, limited-term partnerships, etc. as well as the status of ongoing LLP programs. Please note the limited Band 1 hours at Gemini-N for 25B and 26A.
| Site | Band | 2025B | 2026A | 2026B | 2027A | 2027B | 2028A |
| North | 1 | 30 | 30 | 85 | 85 | 100 | 100 |
| 2 | 85 | 55 | 90 | 90 | 100 | 100 | |
| South | 1 | 0 | 0 | 50* | 60* | 100* | 100* |
| 2 | 50 | 60 | 90 | 80 | 100 | 100 |
* We are not offering Band 1 for Gemini-S in the 2025 LLP call, but expect it to be offered in the 2026 LLP call.
An individual LLP need not request a balanced program across North/South, RA range, observing conditions, etc. However, the ensemble of approved LLPs must not overly impinge on other observing programs. Therefore, the ensemble of approved LPs should not exceed ~25% of any relevant parameter, such as hemisphere, RA range, and observing condition bins. See this page for further information on observing condition constraints.
LLPs will also be subject to general semester target availability restrictions, as published in the general call for proposals for each semester.
The instruments available for new LLPs are listed below, along with any particular restrictions of note. Successful LLPs may also be limited by the semester-specific instrument availability restrictions announced with each semesters regular Call for Proposals. PLEASE READ CAREFULLY!
The GMOS instruments can hold 9 masks at any given time. These masks include those required by regular programs, which may need to be installed for lengthy periods if monitoring is required or if the observation time is large. For these reasons new LLP programs should limit the number of masks needed to around 20 masks per site per semester. The number of masks in a given 3-hour RA range must be less than this - around 5 per semester per site.
PIs from LLP participating partners (currently the US and CA) are invited to submit proposals for Subaru Intensive programs (SIP) to Gemini through the Gemini-Subaru time exchange program. Subaru Intensive programs applications follow the same rules and eligibility used for the Gemini Large and Long Programs (LLPs). The request of Subaru Intensive program must be clearly stated in the title of the proposal. The required Subaru instrument configurations should be specified in the Abstract. At most, one proposal will be selected. It is very important that prospective SIP PIs check the Subaru 25B Call for Proposals (issued in early February) before submitting their full proposal. Note that the PFS large program (Strategic Program) begins S25A which may mean programs requesting many dark nights may not be accomodated.