East Asian VLBI Network (EAVN)

Call for Proposal (CfP)

We invite proposals for general observing time (GOT) and Large Program (LP) observations of EAVN. Please refer to the following KaVA and EAVN webpages for more details about the array and its performance, and how to prepare and submit a proposal.


This EAVN open-use call is based on risk-share, and provides opportunities of VLBI observations at 22 and 43 GHz for astronomers in the world.

We support astronomers in preparation of proposals, scheduling of your observations, and data analysis. If proposers are not familiar with EAVN, they are recommended to include at least one collaborator from EAVN (VERA, KVN, and Tianma). The contact address for the support is eavnhelp@kasi.re.kr.

EAVN observations are conducted with single polarization (LHCP) and the data are recorded with the data rate of 1 Gbps. NRO45's data are recorded with the data rate of 2 Gbps and reformatted to 1 Gbps data. The total observation time for EAVN is up to 100 hours, while the available machine time of each telescope is different between each other. For KaVA, up to 100 hours out of KaVA's 250-hour telescope time is assigned to EAVN observations. For Tianma65, the total observing time of 100 hours is provided for EAVN observations. For NRO45, the total observing time of up to 50 hours is provided for EAVN observations, and the remaining time is carried over in 2019A semester in the case that the total approved time is less than 50 hours. If an EAVN proposal which is not acceptable for observations with EAVN full array but acceptable for observations with KaVA only, the proposal might be accepted for observations with KaVA depending on the evaluation results and the final decision on acceptance of such proposal is made by the combined KaVA/EAVN Time Allocation Committee (TAC). Figure 6 shows a schematic diagram of the time allocation of each telescope for EAVN observations.

The maximum request time per proposal is limited to 24 hours for EAVN. EAVN observations will be scheduled between 1st September 2018 and 15th January 2019, while NRO45 will be available between 1st December 2018 and 15th January 2019 due to availability of the telescope, as shown in Figure 7.

Figure 6: Schematic diagram of time allocation of each telescope for EAVN observations. The observation time for EAVN corresponds to the intersection of 'KaVA' and 'Tianma65' for the 'EAVN22' mode, and of 'KaVA', 'Tianma65', and 'NRO45' for the 'EAVN43' mode.

Figure 7: Possible observation term of each EAVN telescope.

The deadline of submission is at 08:00 UT on 1st June, 2018. Detailed information on the EAVN call-for-proposal can be found in the following webpage:


Note that your proposal should be submitted to the following KaVA proposal submission site regardless of the requested array configuration (KaVA or EAVN).


Both KaVA and EAVN proposals are reviewed by the KaVA/EAVN TAC, thus proposers should specify explicitly the necessity of participation of NRO45 and Tianma65. Otherwise KaVA/EAVN TAC could assign those proposals to KaVA observation time on the basis of rating results. All proposals are reviewed by the referees, and the combined KaVA/EAVN TAC makes rating of each EAVN proposal. Combined KaVA/EAVN TAC finally decides the allocation of telescope time based on each rating result. KaVA may accept some proposals which is not acceptable for observations with EAVN full array taking into account the evaluation result.

A proposal shall contain the coversheet (two pages), scientific justification including figures (maximum of two pages), and technical justification (maximum of one page) with the minimum font size of 10 points. The results of the review will be announced to each PI in late July, 2018. Any questions on proposal submission should be sent to eavnprop@kasi.re.kr.

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EAVN ( East Asia VLBI Network )