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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"

18 results found.

  1. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  2. Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico "Nastro Verde" optical observations
  3. Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations
  4. Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
  5. Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
  6. Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
  7. GRB 230824A: AKO Photometric Follow-up Observations
  8. Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  9. Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
  10. Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  11. Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  12. NICER detection of Swift J1727.8-1613 (GRB 230824A)
  13. Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  14. MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)
  15. GRB 230824A: AKO Optical Afterglow Candidate
  16. Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
  17. GRB 230824A is likely a Galactic Transient: Swift J1727.8-1613
  18. GRB 230824A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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