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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"

12 results found.

  1. Konus-Wind detection of GRB 260120B
  2. GRB 260120B: SVOM/GRM observation
  3. GRB 260120B: AstroSat CZTI detection
  4. GRB 260120B: Swift-BAT refined analysis
  5. GRB 260120B: Swift-XRT refined Analysis
  6. GRB 260120B: Fermi GBM Observation
  7. GRB 260120B: Swift/UVOT Detection
  8. GRB 260120B: COLIBRÍ optical upper limits
  9. GRB 260120B: Enhanced Swift-XRT position
  10. GRB 260120B: SVOM/C-GFT optical counterpart detection
  11. GRB 260120B: Swift detection of a burst
  12. GRB 260120B: 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

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