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27A Semester
The Green Bank Observatory (GBO) Call for Proposals for the 2026B semester has closed on Wednesday, February 4, 2026 at 17:00 EST (21:00 UTC). Please come back here in early July 2026 for information on the 2027A Call for Proposals.
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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).
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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…
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26A Semester
The National Radio Astronomy Observatory/Green Bank Observatory (NRAO/GBO) Call for Proposals for the Semester 2026A closed on Wednesday, 30 July at 22:00 UTC (5:00 P.M. ET). The Semester 2026A Proposal Call information can be viewed here.