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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"

12 results found.

  1. GRB 191016A: REM optical observations
  2. GRB 191016A: Swift-XRT afterglow detection
  3. GRB 191016A: Swift/UVOT Detection
  4. GRB191016A: MITSuME Okayama optical observation
  5. GRB 191016A: AZT-20 (Assy observatory) optical photometry
  6. GRB 191016A: early time BOOTES Network and follow-up 1.5m OSN optical observations
  7. GRB 191016A: RATIR Optical and NIR Observations
  8. GRB 191016A: Optical limit by Ondrejov D50
  9. GRB 191016A: Swift-BAT refined analysis
  10. GRB 191016A: KAIT Optical Afterglow Confirmation
  11. GRB 191016A: COATLI Optical Observations and Detection of the Afterglow
  12. GRB 191016A: Swift detection of a burst

Advanced

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