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Phase I Overview
Applications for time on Gemini are made through National Time Allocation Committees (NTACs) which are individually responsible for scientific and technical assessment and for making recommendations to the Gemini Observatory that time be awarded. Proposals will be solicited by Gemini every 6 months in early March and September; details of the submission and review process vary from Participant to Participant. Proposals for Large and Long Programs are accepted annually and assessed through a separate LP Time Allocation Committee. Proposals for Director's Discretionary Time can be submitted throughout the semester, and this time is open to all astronomers, independent of nationality. Poor weather proposals can also be submitted throughout the semester, and this time is open to users based in participating countries, the host institutions and Gemini staff. International collaborations ("joint proposals"), where time is being sought from several participating countries, must be submitted using the Gemini Phase I Tool (PIT) even if the proposal involves Participants that offer other submission mechanisms. The PIT supports automatic submission to multiple Participants at once. See the joint proposal instructions for more details.
Proposals from outside of the Gemini community must be submitted
through one of the NTACs.
Links to Participant- and host-specific information are contained in the
|US Phase I info||US Policies||Canadian Phase I info||Canadian Policies|
Phase I info
Phase I info
|Australian Phase I info||Australian Policies||Chilean
Phase I info
|University of Hawaii Phase I info||Proposals for University of Hawaii (UH) observing time on Gemini North must have a Principal Investigator affiliated with UH.|
|Korea Phase I information
||Proposals for Korean time under the Limited-Term Partnership MoU. Not available for Joint Proposals.|
In normal operations, application may be made for classical or queue mode observations. Successful queue and classical applications are defined in advance using the Phase II Observing Tool. Classical mode observations are scheduled on specific dates and are carried out by the investigators visiting the telescopes. Queue mode observations are executed by the Gemini staff. This mode offers the potential of better matching observations to the prevailing conditions (e.g. image quality, sky background, cloud cover) and execution of Target of Opportunity observations for classes of targets whose coordinates are not known at the time of proposal submission. Gemini Observatory welcomes a variety of visiting scientists, including classical observers, queue investigators, students, and members of the National Gemini Offices.
The Phase I proposal submission process
is supported by staff in the National Gemini Offices (NGOs).
The Gemini Help Desk should be used to
contact NGO staff regarding proposal submission.
Technical instrument-specific advice is given
in the "Observation Preparation" section of each of the Gemini
instrument web pages.
The worst possible
weather conditions must be specified for each program. The Integration Time Calculators should be used to optimize your exposure time, conditions and signal to noise.
The NTAC results, comprising rank and recommended time awards, are sent electronically to Gemini Observatory. Each proposal is sent as an XML document consisting of attribute/value pairs that encode the proposal information together with a separate PDF file containing the science and technical case. The Gemini Phase I Tool (PIT) automatically generates the XML file. Participants who have chosen to use their own proposal system must translate their internal formats into the correct XML structures in order for the files to be ingested into the observing database. The NTAC and Staff forwarded proposals are merged together to produce a draft program queue at each telescope. For the merging to work effectively, the group of top-rated proposals that would fill that Participants share of the time available should contain a reasonable balance in terms of the observing constraints requested. The NTAC evaluations page lists various considerations for maximizing each Participant's use of their allocated time.
The International Time Allocation Committee (ITAC) consists of representatives from each NTAC and from Gemini Observatory. The merged queue and list of classical programs are considered by the ITAC, and duplications and conflicts are resolved. Observatory operations staff are consulted to ensure that programs can be scheduled; changes may be made to individual programs for schedulability. The recommended programs are forwarded to the Gemini Director for final approval. Approved programs are published on the Gemini public web pages, including: PI name, Participant country, proposal title and abstract, instrument.
Queue programs assigned by the ITAC into queue Science Ranking Band 1 are eligible for rollover into the next semester, for no more than two consecutive semesters, in order to increase the likelihood of program completion. Rollover will apply to queue programs only, and not to Targets of Opportunity programs. The relevant ITAC representatives have the right to recommend withdrawal of execution (and rollover) status.
Scientific and technical feedback to the investigators about their proposal is generated by each NGO/NTAC. Notification of the award of time is generated by Gemini Observatory and sent to each investigator. NGOs then iterate with successful PI's to specify the Phase II observations. The formal handover of responsibility for supporting the investigators, from the NGO to Gemini Observatory, takes place upon transmission to Gemini of the final detailed Phase II program.