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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"

6130 results found.

  1. BATSE GRB trigger criteria
  2. GRB990806: BATSE Observations
  3. Late-time HST/STIS Observations of GRB 990510
  4. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  5. GRB 990510: BATSE Observations
  6. GRB 990510 Optical Observations
  7. GRB 990506: BATSE Observations
  8. GRB 990506, Optical Observations
  9. GRB 990506 optical observations
  10. GRB 990506 optical observations
  11. GRB 990316 optical observations
  12. GRB990123, 15-GHz limits
  13. GRB 990123: BATSE Observations
  14. GRB 990123 Optical Follow-up
  15. GRB981220, Optical Observations
  16. GRB 981220:Optical Observations
  17. GRB 981226 - Infrared Observations
  18. GRB 980326/Host Galaxy
  19. GRB 980923 BATSE Observations
  20. GRB980703, Host galaxy multicolor photometry
  21. GRB 980703: BATSE Observations
  22. GRB 980613: BATSE Observations
  23. SGR1900+14
  24. SGR1900+14
  25. GRB980519 BATSE Observations
  26. BATSE on-board GRB trigger change
  27. GRB980425 BATSE observations
  28. GRB980329
  29. GRB 971214: KPNO Optical Observations
  30. GRB 970228: Keck/LRIS Optical Observations

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Download all Circulars as a .tar.gz archive:
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