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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"

26 results found.

  1. GRB 080810: optical observations
  2. GRB 080810: optical observations
  3. GRB080810 - optical observations
  4. Radio detection of GRB 080810 with the VLA
  5. GRB 080810: RTT150 optical observations
  6. GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
  7. GLAST Burst Monitor detection of GRB 080810
  8. GRB 080810: Liverpool and Faulkes North observations
  9. GRB 080810: RTT150 optical observations
  10. GRB080810: MITSuME optical observation
  11. GRB 080810: Swift/UVOT Refined Analysis
  12. GRB 080810: optical observations
  13. GRB 080810: Liverpool Telescope observations
  14. GRB 080810: D50 optical observation
  15. GRB 080810: Kanazawa optical observation
  16. GRB 080810: OSN follow-up
  17. GRB 080810: Observations from NOT
  18. GRB 080810: RTT150 optical observations
  19. GRB 080810: Swift-XRT Team refined analysis
  20. GRB 080810: Enhanced Swift-XRT position
  21. GRB 080810: KANATA optical-NIR observation, update
  22. GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
  23. GRB 080810: Keck/HIRES Spectroscopy
  24. GRB 080810, Swift-BAT refined analysis
  25. GRB 080810 : optical observation with KANATA
  26. GRB 080810: Swift detection of a burst with a bright optical afterglow

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