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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"

6 results found.

  1. Further Swift-XRT observations of the probable GRB 081105.
  2. GRB 081105: GROND Upper Limits
  3. GRB 081105: Observations from OSN
  4. UVOT/Swift observations of GRB081105
  5. Swift-XRT observations of GRB 081105
  6. GRB 081105 Swift/BAT and IPN Localization

Advanced

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