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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 130725B: Swift/UVOT Observations
  2. GRB 130725B: Swift trigger time correction
  3. GRB 130725B, Swift-BAT refined analysis
  4. GRB 130725B: Swift-XRT refined Analysis
  5. GRB130725B: REM-ROS2 optical observations
  6. GRB 130725B - UVOT-enhanced XRT position
  7. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  8. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  9. GRB 130725B: Swift detection of a burst

Advanced

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