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Data Access


Link to archive:



It is the policy of the European VLBI Network’s (EVN) Consortium Board of Directors (CBD) that the investigators named on an EVN or global VLBI proposal have the sole right of access to the data obtained for that proposal for 12 months after the distribution of the data to the PI. If the proposal comprises multiple observations (i.e., separately scheduled experiments in one or more network or ad-hoc sessions), then the 12 month period begins from the distribution of the final observation associated with the proposal. For proposals fully distributed prior to 1 June 2004, the 12 month period begins from that date. For Target-of-Opportunity proposals, this proprietary period is 6 months, owing to the time-critical nature of such experiments. This reduced proprietary period will apply to all target-of-opportunity proposals submitted 1 October 2011 or later. Following the expiry of the proprietary period for a proposal, all data related to it will be publicly accessible.

One month prior to the public release of data from a proposal, JIVE will inform the PI (at the last known e-mail address) about the impending action. Under exceptional circumstances the PI can request a short delay in the release date. All such requests should be made to the Chairman of the EVN Programme Committee.

It is the intention of the CBD that all data correlated at the EVN Data Processor at JIVE will be placed into the EVN archive. This archive will contain the raw FITS format data, calibration tables, various diagnostic plots, calibrated visibility data, and pipelined images. The images will be preliminary; in many cases further editing, self-calibration, or other refinements may be required to bring out particular features of interest.


Building the archive

The archive will be populated in two stages:

Immediately after correlation, the archive for a particular project will include for all sources (including the targets): correlator diagnostic plots, ANTAB & UVFLG files and the a-priori amplitude calibration (CL) table. Plots and further CL (SN) tables generated by the pipeline (including fringe-fitting results) will all be available. JIVE will ask the PI prior to correlation whether to treat each source in the schedule as “public” or “private”. Source-specific pipeline results (calibrated visibilities, images, other plots) for the PI-specified “public sources” will also be available immediately, but those for the specified “private sources” will remain protected over the proprietary period. The PI is also given the option to avoid generating images of the private sources altogether.
Once the proprietary period expires, the calibrated visibilities, images, and other pipeline plots related to the private sources will also become publicly available, as will the raw FITS-format data.
If you or your colleagues subsequently publish or use EVN data, including that obtained from the EVN archive, we request that you use the standard EVN acknowledgment:

"The European VLBI Network is a joint facility of independent European, African, Asian, and North American radio astronomy institutes. Scientific results from data presented in this publication are derived from the following EVN project code(s): XXXXX"

(Fill in the appropriate project codes at the end of this acknowledgment; in this sense, the “project code” should be the 5-character code, without the final letter that distinguishes between multiple epochs and/or frequency bands, if applicable.)