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27A Semester
The National Radio Astronomy Observatory / Green Bank Observatory (NRAO/GBO) Call for Proposals for the Semester 2027A closed on Wednesday, 29 July 2026 at 17:00 EDT (21:00 UTC). The 2027A Proposal Call information can be viewed here.
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27B Semester
The Green Bank Observatory (GBO) Call for Proposals for the 2027A semester has closed on Wednesday, July 29, 2026 at 17:00 EST (21:00 UTC). Please come back here in early January 2027 for information on the 2027B Call for Proposals. The Green Bank Observatory (GBO) invites the scientific community to submit proposals for the 2027B Semester. Submission Deadline:Wednesday,…
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26B Semester
2026B Call for Proposals The Green Bank Observatory (GBO) invites the scientific community to submit proposals for the 2026B Semester. Submission Deadline:Wednesday, 4 February 2026, at 17:00 EST (22:00 UTC). The National Radio Astronomy Observatory / Green Bank Observatory (NRAO/GBO) Call for Proposals for the Semester 2026B closed on Wednesday, 4 February 2026 at 17:00 ET (22:00 UTC).…
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Balance failing for PF800
The Green Bank Observatory is aware that the AstrID Balance() command is failing for observations using the Prime Focus 800 MHz receiver.
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PF800 noise diodes
The noise diodes for PF800 are known to be incorrect.
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25B-26A Filler Time
Special Call for GBT 25B-26A Filler Time Proposals The Green Bank Observatory (GBO) invites the scientific community to submit Special Call proposals for filler-time observations on the Green Bank Telescope (GBT) during the 25B and 26A semesters. Approved projects will be conducted through July 31, 2026. Submission Deadline:Friday, November 28, 2025, at 22:00 UTC (17:00 Eastern Time)
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Change in balance command
We have released a change in the behavior of the Balance() command on the GBT.
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MUSTANG2 MaDCoWS Data
The Massive and Distant Clusters of WISE Survey (MaDCoWS) is a catalog of >2000 massive galaxy clusters at z~1. The goal of this GBT observing program was to observe many of the most massive MaDCoWS clusters with MUSTANG2 in order to obtain a Sunyeav-Zeldovich Effect mass estimate. 26 MaDCoWS clusters were observed and the resulting…