Proposing

  • GBT Observer Alert

    GBT at Full azimuth Slew Rate

    The GBT has returned to the regular full azimuth slew rate.

    Read More …

  • GBT Observer Alert

    RH8 UPGRADE COMPLETE

    The Green Bank Observatory has finished the process of upgrading to Red Hat 8 (RH8). Observations can again be done with either machine Ariel or Titania!

    Read More …

Current Call for Proposals

  • The Green Bank Observatory (GBO) Call for Proposals for the Semester 2025A
    closed on Wednesday, 31 July at 21:00 UTC.

    Please come back here in early January 2025 for the Semester 2025B Proposal Call information.

Additional Information

Useful Resources


Previous Calls for Proposals

In the posts below you will find information on previous proposal calls (in reverse-chronological order) including for each semester the proposal call results and a list of the science program.


View all past proposal calls



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