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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"

10 results found.

  1. GRB 250807A: Swift-BAT refined analysis
  2. GRB 250807A: SVOM/VT optical continued observation
  3. Konus-Wind detection of GRB 250807A
  4. GRB 250807A: Swift/UVOT Detection
  5. GRB 250807A: Swift-XRT refined Analysis
  6. GRB 250807A: SVOM/GRM observation
  7. GRB 250807A: AstroSat CZTI detection of bright long burst
  8. GRB 250807A: SVOM/VT optical observation
  9. GRB 250807A: Enhanced Swift-XRT position
  10. GRB 250807A: Swift detection of a burst with an optical counterpart

Advanced

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