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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"

13 results found.

  1. GRB 201104B: Maidanak and CrAO optical observations
  2. GRB 201104B: continued TSHAO optical observation
  3. GRB 201104B: MITSuME Akeno optical observation
  4. GRB 201104B: 1.3m DFOT optical observations
  5. GRB 201104B: Kitab optical observations
  6. GRB 201104B: TSHAO optical observation
  7. GRB 201104B: Swift/UVOT Detection
  8. GRB 201104B: Swift-XRT refined Analysis
  9. GRB 201104B: VLT/X-shooter redshift
  10. GRB 201104B: Swift-BAT refined analysis
  11. GRB 201104B: Swift/UVOT Detection
  12. GRB 201104B: MASTER optical observation
  13. GRB 201104B: Swift detection of a burst

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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