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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 150724B: Swift-XRT afterglow detection
  2. GRB 150724B: Continued RATIR Optical Observations
  3. GRB 150724B: MASTER upper limit
  4. GRB 150724B: Swift/UVOT Detection
  5. Konus-Wind observation of GRB 150724B
  6. GRB 150724B: RATIR Optical Observations
  7. GRB 150724B: Swift-XRT observations
  8. GRB 150724B: Swift ToO observations
  9. GRB 150724B: Fermi GBM detection
  10. GRB 150724B: Fermi-LAT detection

Advanced

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