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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 111016A: optical upper limit
  2. GRB111016A : WIYN 3.5m NIR observations
  3. GRB111016A: D50 optical limit
  4. GRB 111016A: Gemini Detection of the NIR Counterpart
  5. GRB 111016A: Swift/UVOT Detection of a Source
  6. GRB 111016A: Swift-BAT refined analysis
  7. GRB 111016A: P60 Afterglow Candidate
  8. GRB 111016A: MITSuME Akeno Optical upper limits
  9. GRB 111016A: Swift-XRT refined Analysis
  10. GRB 111016A: Enhanced Swift-XRT position
  11. GRB 111016A: Swift-XRT observations
  12. GRB 111016A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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