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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"

6 results found.

  1. Konus-Wind detection of GRB 230919A
  2. IPN triangulation of GRB 230919A (short)
  3. GRB 230919A: Fermi GBM Observation
  4. GRB 230919A: Swift/BAT-GUANO detection of a possibly short burst outside the coded FOV
  5. GRB 230919A: AstroSat CZTI detection
  6. GRB 230919A: Fermi GBM Final Real-time Localization

Advanced

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