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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 070802: REM optical observations
  2. GRB 070802: Swift-XRT refined analysis
  3. GRB 070802: Confirmation of the optical afterglow
  4. GRB 070802, Swift-BAT refined analysis
  5. GRB 070802: VLT redshift
  6. GRB 070802: refined Swift XRT position
  7. GRB 070802: V-band detection of the candidate afterglow
  8. GRB 070802: LCO I-band candidate
  9. GRB 070802: GROND J band candidate
  10. GRB 070802: LCO optical observations
  11. GRB 070802: Swift detection of a burst

Advanced

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