The East Asian Observatory (EAO) is pleased to announce the regular call for proposals for Semester 27A at the James Clerk Maxwell Telescope (JCMT). Please submit your proposals via the JCMT proposal handling system, Hedwig. For full details and submission instructions, please visit:
https://proposals.eaobservatory.org/jcmt/semester/31/regular
The deadline for 27A Principal Investigator (PI) Proposals is December 5, 2026, at 01:00 UTC. The Hedwig system permits the submission (and editing) of proposals until this deadline.
The instruments available for the 27A semester are listed below, along with their respective availability:
- ʻAlaʻihi (86 GHz), ʻŪʻū (230 GHz) and HARP (345 GHz) will be available throughout the semester.
- ʻĀweoweo (345 GHz) is planned to be available for approximately half the semester
- Kuntur (690 GHz) is planned to be available for approximately half the semester
When installed, Kuntur replaces ʻĀweoweo in the Nāmakanui receiver. Please note that the exact dates for switching between ʻĀweoweo and Kuntur has not been decided, and will be determined based on operational needs and science demand. ʻAlaʻihi, is offered in shared-risk mode.
Kuntur is a 690 GHz receiver offered to the JCMT community in collaboration with the Large Latin American Millimeter Array (LLAMA). Kuntur is a sideband-separating (2SB), dual-polarization receiver, with an observable sky frequency range of approximately 609 to 715 GHz (default IF 5.5 GHz).
ʻAlaʻihi is a dual-polarization, single-sideband (SSB) receiver, operating in upper sideband (USB) only, with an LO frequency range of 80.0 to 88.5 GHz. This corresponds to a sky frequency of approximately 86.0 to 94.5 GHz, given an IF of 6 GHz. The instrument’s performance for different IF values (e.g., 7 GHz) is under ongoing characterization.
The respective instrument webpages will be updated with definitive commissioning results for ʻAlaʻihi, Kuntur, and ʻĀweoweo as they become available. For further information, please visit the JCMT instruments webpage:
https://www.eaobservatory.org/jcmt/instrumentation/heterodyne/
PIs must meet the regional or institutional affiliation requirements for Taiwan, Thailand, the United Kingdom or the 27A semester Expanding Partner Program regions (Malaysia, Vietnam, Indonesia, and India, and Brazil and Argentina). Co-I status is not similarly restricted. For details regarding PI eligibility, please see:
https://www.eaobservatory.org/jcmt/proposals/eao_eligibility/
If this is your first time using Hedwig, you should use the ‘Log In’ button to generate an account. There is a Hedwig ‘Help’ facility at the upper right corner of each page, and individual Help tags in many other places.
Please contact us at helpdesk@eaobservatory.org if you have any questions.