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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"

13 results found.

  1. GRB240828B: REM optical/NIR upper limits
  2. GRB 240828B: AbAO optical upper limit
  3. GRB 240828B: Mephisto optical upper limit
  4. GRB 240828B: GRANDMA Optical Upper Limit
  5. GRB 240828B: J-band upper limit from WINTER
  6. GRB 240828B: GMG Optical Upper Limit
  7. GRB 240828B: GWAC-F50A optical upper limit
  8. GRB 240828B: SVOM/C-GFT optical upper limit
  9. GRB 240828B: SAO RAS optical upper limit
  10. GRB 240828B: KAIT optical upper limit
  11. GRB 240828B: Swift-XRT afterglow detection
  12. GRB 240828B: Swift ToO observations
  13. GRB 240828B : Detection of a possible very soft X-ray transient by SVOM/ECLAIRs

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

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