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| Term | 2026B | Category | EAVN |
|---|---|---|---|
| Submit start (UT) | 2026-04-27 00:00:00 | Deadline (UT) | 2026-06-01 08:00:00 |
| TeX file | EAVN_Proposal_2026B.tex | Sample pdf | EAVN_Proposal_2026B.pdf |
| *************************************************** Call for Proposals for the East Asian VLBI Network (EAVN) for the 2026B semester Proposal submission deadline: 2026 June 1 (Mon.), 8:00 UT EAVN website: https://eavn.kasi.re.kr/ *************************************************** --- Major revisions from the 2026A semester --- * All Chinese telescopes (Tianma, Sheshan, Nanshan, and Kunming) do not join the EAVN open-use program in the 2026B semester. * Accepting two-semester-long proposals is suspended temporarily in the 2026B semester. * Telescope time provided by KaVA (KVN and VERA) is changed in the 2026B semester (424 hours). ----------------------------------------------- *** 1. Overview *** We invite proposals for open-use observations with the East Asian VLBI Network (EAVN), which is the international collaborative VLBI array between China, Korea, Japan, and Thailand. In the 2026B semester, 13 telescopes (KaVA (VERA 4 x 20 m and KVN 4 x 21 m), Nobeyama 45 m, Takahagi 32 m, Hitachi 32 m, Yamaguchi 32 m, and Sejong 22 m) participate in the EAVN open-use program. Note that all Chinese telescopes (Tianma 65 m, Sheshan 25 m, Nanshan 26 m, and Kunming 40 m) do not join the open-use program in the 2026B semester for conducting the Chinese lunar satellite tracking mission. *** 2. Observing mode *** EAVN provides opportunities of VLBI observations with a data recording rate of 1 Gbps (total bandwidth of 256 MHz) and with single polarization at 6.7, 22, and 43 GHz. Dual-polarization mode is also opened on a shared-risk basis (KaVA 8 telescopes and Takahagi). Dual-frequency (22 and 43 GHz) simultaneous observation system can also be used for EAVN observations at KaVA and Sejong, while the observing term in which the system is available will be determined later. Note that only the single-polarization mode is operational for dual-frequency simultaneous observation. Details of available observing mode can be found in the EAVN Status Report on the EAVN website. *** 3. Telescope time and array configuration *** The total available observation time for EAVN is up to 424 hours in the 2026B semester, while the available observing time for individual EAVN telescopes are different. Please refer to the EAVN status report on the EAVN website for more details. All EAVN observations will be allocated from 2026 September 1 – 2027 January 15, while note that Nobeyama will join EAVN observations from November 1. EAVN accepts a request for usage of sub-array configuration (KaVA 8 telescopes and additional telescopes from non-KaVA stations). There are several conditions of the antenna combination depending on the observing frequency. Further details about the sub-array configuration are shown in the EAVN status report. *** 4. Maximum total request time *** In the 2026B semester, no limitation of the maximum request time for a single proposal is determined in case of usage of only KaVA 8 telescopes, while one can request for the maximum total telescope time of 24 hours for Takahagi, Hitachi, Yamaguchi and Sejong, and 15 hours for Nobeyama. All Chinese telescopes do not join the open-use program in the 2026B semester, as mentioned in Section 1. Following this, accepting two-semester-long proposals (request for the telescope time for two adjacent semesters (2026B and 2027A)) is suspended temporarily in the 2026B semester. *** 5. Target of opportunity *** EAVN accepts target of opportunity (ToO) proposals. Note that Nobeyama and Sejong cannot be included for ToO proposals, and other non-KaVA telescopes (Takahagi, Hitachi, and Yamaguchi) will join ToO observations on a best-effort basis. It is strongly recommended that ToO proposals (especially expected ToO) are submitted during the regular CfP, while unexpected or urgent ToO can be submitted as Director's Discretionary Time (DDT) proposals at any time. Note that the total approved time for ToO observation in the 2026B semester is limited to be 100 hours for ToO proposals for both expected and unexpected events. ToO proposals must address clear triggering criteria to initiate an observation. ToOs are valid for one year after it is approved. ToO proposals for DDT should follow the same way of regular call and should be submitted via the EAVN website. *** 6. Proposal submission *** Proposals should be submitted via the EAVN website. Proposers are asked to sign up with the EAVN website prior to submitting a proposal. Proposal submission deadline is 2026 June 1 (Mon.), 8:00 UT. Please refer to the EAVN status report for detailed information about the proposal format. The designated cover sheet form can be downloaded from the EAVN websites. *** 7. Acknowledgment *** All EAVN users are asked to specify the acknowledgment to EAVN in their publications. A template for the acknowledgment can be found in the EAVN website. Sincerely, Mareki Honma Director of Mizusawa VLBI Observatory, NAOJ Taehyun Jung Director of KVN Center, KASI Zhi-Qiang Shen Shanghai Astronomical Observatory, CAS and Xia Zhou Director of Xinjiang Astronomical Observatory, CAS |
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