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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"

10 results found.

  1. GRB 230911C: ATCA detection of possible radio counterpart
  2. GRB 230911C: Swift-XRT refined Analysis
  3. GRB 230911C: Swift-BAT refined analysis
  4. GRB230911C: BOOTES-6/DPRT optical upper limit
  5. Swift GRB 230911C: Global MASTER-Net observations report
  6. GRB230911C: LCOGT Optical Upper Limits
  7. GRB 230911C: Swift/UVOT Upper Limits
  8. GRB 230911C: GOTO optical upper limits
  9. GRB 230911C: Enhanced Swift-XRT position
  10. GRB 230911C: Swift detection of a burst

Advanced

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