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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"

8 results found.

  1. GRB 210218A: Swift-XRT confirmation of afterglow
  2. GRB 210218A: Swift/UVOT observations
  3. GRB 210218A: Swift-XRT observations
  4. GRB 210218A: Swift-BAT refined analysis
  5. GRB 210218A: MITSuME Akeno optical upper limits
  6. GRB 210218A： GWAC-F60A optical upper limit
  7. GRB 210218A: NEXT optical upper limit
  8. GRB 210218A: Swift detection of a burst

Advanced

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