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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"

5 results found.

  1. GRB 250603A: Swift/UVOT Upper Limits
  2. GRB 250603A: Swift-XRT refined Analysis
  3. GRB 250603A: Enhanced Swift-XRT position
  4. GRB 250603A: Swift-XRT position and confirmation of GRB nature
  5. GRB 250603A: Swift detection of a burst or new Galactic transient Swift J0839.7-3916

Advanced

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