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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. GRB 230322B: Swift-BAT refined analysis
  2. GRB 230322B: Swift/UVOT Detection
  3. GRB 230322B: Swift-XRT refined Analysis
  4. GRB 230322B: Enhanced Swift-XRT position
  5. Swift GRB 230322B: Global MASTER-Net observations report
  6. GRB 230322B: Swift detection of a burst with optical counterpart

Advanced

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