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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 220412A: GRANDMA observations
  2. GRB 220412A: Continued RATIR Observations and Steepening of the Light Curve
  3. GRB 220412A: BOOTES-network optical upper limits
  4. GRB 220412A: Swift-BAT refined analysis
  5. GRB 220412A: RATIR Observations of the Fading Afterglow
  6. GRB 220412A: MITSuME Akeno optical upper limits
  7. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  8. GRB 220412A: Swift-XRT refined Analysis
  9. GRB 220412A: Enhanced Swift-XRT position
  10. GRB 220412A: Swift/UVOT Upper Limits
  11. GRB 220412A: RATIR Afterglow Candidate
  12. GRB 220412A: Swift detection of a burst

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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