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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"

14 results found.

  1. GRB 250219A: NOT candidate host galaxy detection
  2. GRB 250219A: SVOM/C-GFT optical upper limit at early phase
  3. GRB 250219A: EP-FXT afterglow detection
  4. GRB 250219A: NUTTelA-TAO / BSTI Optical Limits
  5. GRB 250219A: GRANDMA/Kilonova-Catcher upper limits
  6. GRB 250219A: Swift/UVOT Upper Limits
  7. GRB 250219A: OHP/T193 optical upper limit
  8. GRB 250219A: NOT optical observations
  9. GRB 250219A: COLIBRÍ/DDRAGO Detection of the Optical Counterpart
  10. GRB 250219A: 1.6m Mephisto optical upper limits
  11. GRB 250219A: SVOM/VT optical counterpart
  12. GRB 250219A: Swift-XRT observations
  13. GRB 250219A: Swift ToO observations
  14. GRB 250219A: SVOM detection of a burst

Advanced

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