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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"

11 results found.

  1. GRB 241113B : RAPAS follow-up observation
  2. GRB 241113B: EP-FXT afterglow detection
  3. GRB 241113B: SVOM/VT optical afterglow observations
  4. GRB 241113B: Mephisto upper limits
  5. GRB 241113B: KAIT Optical Afterglow Candidate
  6. GRB 241113B: J-band upper limit from WINTER
  7. GRB 241113B: Swift-XRT observations
  8. EP241113b/GRB 241113B: EP detection of GRB 241113B
  9. GRB 241113B: SVOM/GRM observation
  10. GRB 241113B: Swift ToO observations
  11. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs

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.

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