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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. GRB070621: RTT150 optical observations
  2. GRB 070621: VLT optical observations
  3. GRB 070621: Swift/UVOT Upper Limits
  4. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  5. GRB 070621: Swift-BAT refined analysis
  6. GRB 070621: Gemini South optical imaging
  7. GRB 070621: UVOT-enhanced XRT position
  8. GRB 070621: NOT observations
  9. GRB070621: OPTIMA-Burst optical upper limit
  10. GRB 070621: TAROT Calern observatory optical observations
  11. GRB 070621: Watcher Observations
  12. GRB 070621: ROTSE-III Prompt Optical Limits
  13. GRB 070621: 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.
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Get involved on GitHub.

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