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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"

9 results found.

  1. GRB 050318: Swift-BAT refined analysis
  2. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  3. GRB 050318: SWIFT-UVOT refined analysis
  4. GRB 050318: Absorption redshift from Magellan
  5. GRB 050318: Swift/UVOT detection of afterglow emission
  6. GRB 050318: Magellan optical afterglow identification
  7. GRB050318: Swift XRT position
  8. RXTE Observations of GRB050318
  9. Swift-BAT detection of GRB 050318

Advanced

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