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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 210824A: Swift/UVOT Upper Limits
  2. GRB 210824A: Swift-BAT refined analysis
  3. GRB 210824A: MITSuME Akeno optical upper limits
  4. Swift GRB 210824A: Global MASTER-Net observations report
  5. GRB 210824A: BOOTES-5/JGT optical upper limit
  6. GRB 210824A: Fermi GBM Observation
  7. Fermi GRB 210824A: Global MASTER-Net observations report
  8. GRB 210824A: Nanshan/NEXT optical upper limit
  9. GRB 210824A: Swift-XRT refined Analysis
  10. GRB 210824A: Enhanced Swift-XRT position
  11. GRB 210824A: Swift detection of a burst
  12. GRB 210824A: Fermi GBM Final Real-time Localization

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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