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Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
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Presentations

The GCN presentation provides the background on GCN, and overview of capabilities technical details on the implementation, tutorials on signing up for Notices and Circulars, as well as overviews of new features and those in development.

GCN Presentation Preview

Publications

The GCN Team has published or are preparing papers that describe both GCN Classic (Barthelmy et al. 1995) and the new GCN (Racusin, Singer, et al. 2026), as well as a study of the Circulars archive (Sharma et al. 2026).

Bibliography

Barthelmy, S. D., P. Butterworth, T. L. Cline, N. Gehrels, G. J. Fishman, C. Kouveliotou, and C. A. Meegan. 1995. “BACODINE, the Real-Time BATSE Gamma-Ray Burst Coordinates Distribution Network.” Astrophysics and Space Science 231 (1–2): 235–38. https://doi.org/10.1007/BF00658623.
Racusin, J. L., L. P. Singer, et al. 2026. “General Coordinates Network (GCN): NASA’s Next Generation Time-Domain and Multimessenger Astronomy Alert System.” In Preparation.
Sharma, Vidushi, Ronit Agarwala, Judith L. Racusin, Leo P. Singer, Tyler Barna, Eric Burns, Michael W. Coughlin, et al. 2026. “Large Language Model─driven Analysis of General Coordinates Network (GCN) Circulars.” Astrophysical Journal Supplements 283 (1): 30. https://doi.org/10.3847/1538-4365/ae2e9c.
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