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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"

10 results found.

  1. GRB 210618A: 1.5m OSN optical upper limit
  2. GRB 210618A: Swift-XRT afterglow detection
  3. GRB 210618A: Swift/UVOT Upper Limits
  4. GRB 210618A: BOOTES-2/TELMA optical upper limit
  5. GRB 210618A: Swift-BAT refined analysis
  6. GRB 210618A: Fermi GBM observation
  7. GRB 210618A: Swift-XRT observations
  8. GRB 210618A: DDOTI upper limit for the optical afterglow
  9. GRB 210618A: Swift detection of a burst
  10. GRB 210618A: Fermi GBM Final Real-time Localization

Advanced

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