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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23 results found.

  1. GRB 210822A: CALET Gamma-Ray Burst Monitor detection
  2. GRB 210822A: CAHA 2.2m observations
  3. GRB 210822A: TSHAO continued optical observation
  4. GRB 210822A: VLA detection
  5. GRB 210822A: TSHAO optical observation
  6. GRB 210822A: Swift/UVOT Detection
  7. GRB 210822A: GROND observations
  8. GRB 210822A: Abbey Ridge Observatory optical afterglow observation
  9. GRB 210822A: Detection by GRBAlpha
  10. GRB 210822A: GECAM refined analysis
  11. Konus-Wind detection of GRB 210822A
  12. GRB 210822A: AstroSat CZTI detection
  13. GRB 210822A: NOT photometry and spectroscopy
  14. GRB 210822A: Swift-XRT refined Analysis
  15. GRB 210822A: Swift-BAT refined analysis
  16. GRB 210822A: Fermi-LAT detection
  17. GRB 210822A: Nanshan/NEXT optical observations
  18. GRB 210822A: Enhanced Swift-XRT position
  19. Swift GRB 210822A: Global MASTER-Net observations report
  20. GRB 210822A: RATIR Optical Detections
  21. GRB 210822A: KAIT Optical Afterglow Confirmation
  22. GRB 210822A: GECAM detection
  23. GRB 210822A: Swift detection of a burst with an optical afterglow

Advanced

Download all Circulars as a .tar.gz archive:
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