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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.

Advanced Search Examples (click to copy):

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

25 results found.

  1. GRB 200613A: Host galaxy redshift from OSIRIS/GTC
  2. GRB 200613A: Continued CrAO optical observations
  3. GRB 200613A: CrAO optical observations
  4. GRB 200613A: R-band observations from HCT
  5. GRB 200613A: Further Liverpool Telescope observations
  6. GRB 200613A: continued Kitab optical observations
  7. GRB 200613A: SAO RAS optical observations
  8. GRB 200613A: Mondy optical observations
  9. GRB 200613A: Jet-break from Xinglong-2.16m optical observations
  10. GRB 200613A: CALET Gamma-Ray Burst Monitor detection
  11. GRB 200613A: MITSuME Akeno optical upper limits
  12. GRB 200613A: continued AbAO optical afterglow observations
  13. GRB 200613A: Continued Xinglong-2.16m optical observations
  14. GRB 200613A: Swift/UVOT Detection
  15. GRB 200613A: Xinglong-2.16m optical observations
  16. GRB 200613A: Liverpool Telescope observations
  17. GRB 200613A: OAJ Afterglow: Error in Coordinates
  18. GRB 200613A: Kitab and AbAO optical afterglow observations, host galaxy candidate
  19. GRB 200613A: Swift-XRT afterglow detection
  20. GRB 200613A: Candidate afterglow from OAJ
  21. Fermi GRB 200613A: Global MASTER-Net observations report
  22. GRB 200613A: Swift ToO observations
  23. GRB 200613A: Fermi-LAT detection
  24. GRB 200613A: Fermi GBM observation
  25. GRB 200613A: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive:
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