East Asian VLBI Network (EAVN)

Call for Proposals for the East Asian VLBI Network (EAVN) for the 2020B semester

Proposal submission deadline: 15th June, 2020, 8:00 UT

Go to proposal submission

Major revisions from the 2020A semester
  • EAVN is operated using 8 telescopes due to reduction of VERA's telescope (Iriki, Ishigakijima, and Ogasawara)
  • Following new observation modes are opened.
    • Dual-frequency (22/43 GHz) simultaneous data reception (KaVA and Nobeyama)
    • Phase-referencing mode (KaVA and Nanshan)

We invite proposals for open-use observations with the East Asian VLBI Network (EAVN), which is the international collaborative VLBI array between China, Korea, and Japan. In the 2020B semester, 8 telescopes (VERA Mizusawa 20 m, KVN 3 x 21 m, Nobeyama 45 m, Takahagi 32 m, Tianma65 m, and Nanshan 26 m) participate in the EAVN open-use program.

Observing mode

EAVN provides an opportunity of VLBI observations with a data recording rate of 1 Gbps (total bandwidth of 256 MHz and with single polarization (LHCP) at 22 and 43 GHz. From the 2020B semester, dual-frequency (22 and 43 GHz) simultaneous observation system can be used for EAVN observations at KaVA and Nobeyama. Phase-referencing mode is also provided with KaVA and Nanshan. Please refer to the EAVN status report on the EAVN website for more details.

Telescope time

The total available observation time for EAVN is up to 500 hours in the 2020B semester, while the available observing time for individual EAVN telescopes are different. All EAVN observations will be allocated from 1st September 2020 to 15th January 2021. Please refer to the EAVN status report on the EAVN website for more details.

EAVN accepts a request of usage of sub-array configuration (KaVA 4 telescopes and additional telescopes from non-KaVA stations), as well as EAVN full array configuration.

The maximum request time for a single EAVN proposal is limited to 24 hours in case of usage of EAVN (KaVA and additional telescopes from non-KaVA stations), while no limitation of the maximum request time is set in case of usage of only KaVA 4 telescopes. Proposers can request their project to be allocated over a year until the end of the 2021A semester (10th June, 2021), while the total request time is still limited as shown above for each EAVN proposal.

Target of opportunity

EAVN accepts target of opportunity (ToO) proposals, while Nobeyama and Takahagi cannot be included for ToO proposals. It is strongly recommended that ToO proposals (especially expected ToO) are submitted during the regular CfP. Unexpected or urgent ToO can be submitted as Director's Discretionary Time (DDT) proposals at any time. ToO proposals must include 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.

Proposal submission

Proposals should be submitted via EAVN website. Proposal submission deadline is 15th June 2020, 8:00 UT. Please refer to the EAVN status report for detailed information about the proposal format. The designated coversheet form can be downloaded from the EAVN websites.


Mareki Honma
Director of Mizusawa VLBI Observatory, NAOJ

Kee-Tae Kim
Director of Radio Astronomy Division, KASI

Zhi-Qiang Shen
Director of Shanghai Astronomical Observatory, CAS

Na Wang
Director of Xinjiang Astronomical Observatory, CAS

KASI logo image

EAVN ( East Asia VLBI Network )