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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 180618A: AstroSat CZTI detection
  2. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  3. GRB 180618A: Swift/UVOT Detection
  4. GRB 180618A: TSHAO optical upper limit
  5. GRB 180618A: Xinglong-2.16m optical upper limit
  6. GRB 180618A: MASTER OT observation (a short GRB with extended emission)
  7. GRB 180618A: Swift-BAT refined analysis (a short GRB with extended emission)
  8. GRB 180618A: Fermi GBM detection
  9. GRB 180618A: Swift-XRT refined Analysis
  10. GRB 180618A: LT prompt observations
  11. GRB 180618A: Enhanced Swift-XRT position
  12. GRB 180618A: Swift detection of a burst with an 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.
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Get involved on GitHub.

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