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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"

12 results found.

  1. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  2. GRB 190204A: Swift-BAT refined analysis
  3. Konus-Wind observation of GRB 190204A
  4. GRB 190204A: SAO RAS optical observations
  5. GRB 190204A: Mondy optical upper limit
  6. GRB 190204A: Swift/UVOT Detection
  7. GRB 190204A: Enhanced Swift-XRT position
  8. GRB 190204A: COATLI Optical Detection of the Fading Afterglow
  9. GRB 190204A: Swift-XRT refined Analysis
  10. GRB 190204A: AstroSat CZTI detection
  11. GRB 190204A: MAXI/GSC detection
  12. GRB 190204A: Swift detection of a burst with a possible optical counterpart

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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