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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"

11 results found.

  1. GRB 080325: optical upper limit
  2. GRB 080325, Swift-BAT refined analysis
  3. GRB 080325: Subaru detection of NIR afterglow candidate
  4. GRB 080325: MITSuME Akeno optical upper limits
  5. GRB080325: XRT Refined Analysis
  6. GRB 080325: GROND Observations
  7. GRB 080325: Swift/UVOT Upper Limits
  8. GRB 080325: Early observations from OSN
  9. GRB 080325: NIR afterglow candidate
  10. GRB 080325: Enhanced Swift-XRT position
  11. GRB 080325: Swift detection of a burst

Advanced

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