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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. GRB100526B: GROND Upper limits
  2. GRB 100526B: Swift-XRT confirmation of fading afterglow
  3. GRB 100526B: Swift/UVOT Upper Limits
  4. GRB 100526B: Swift-BAT refined analysis
  5. GRB 100526B: Swift XRT/UVOT observations
  6. GRB 100526B: Swift detection of a probable GRB

Advanced

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