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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

10 results found.

  1. GRB 210211A: ePESSTO+ NTT optical observations
  2. GRB 210211A: Swift/UVOT Detection
  3. GRB 210211A: Swift-XRT refined Analysis
  4. GRB 210211A: Swift-BAT refined analysis
  5. GRB 210211A: Fermi GBM observation
  6. GRB 210211A: Enhanced Swift-XRT position
  7. GRB 210211A: MASTER optical observation of REM OT
  8. GRB 210211A: REM optical/NIR afterglow detection
  9. GRB 210211A: Swift detection of a burst
  10. GRB 210211A: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

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