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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 190630B: Tien Shan and Koshka Zeiss-1000 optical upper limits
  2. GRB 190630B: Swift/UVOT Upper Limits
  3. GRB 190630B: KAIT Optical Afterglow Confirmation
  4. GRB 190630B: Swift-XRT refined Analysis
  5. GRB 190630B, Swift-BAT refined analysis
  6. Swift Trigger 912102: possible GRB 190630B

Advanced

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