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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"

5 results found.

  1. GRB 240118C: GECAM-B detection of a long burst
  2. GRB 240118C: Fermi GBM Observation
  3. GRB 240118C: Swift/BAT-GUANO detection of a burst
  4. GRB 240118C: Fermi GBM Final Localization
  5. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)

Advanced

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