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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"

6249 results found.

  1. GRB 000528 Optical Observations
  2. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  3. GRB000301C, Radio observations
  4. GRB000301C, Radio observations
  5. GRB 000210: BATSE Observations
  6. BATSE GRB trigger criteria changed
  7. BATSE Observations of GRB000115
  8. GRB 991216: Updated BATSE parameters
  9. IR observations of GRB991216
  10. GRB 991216 Radio Observations
  11. GRB 991208 SAO-RAS Spectroscopy
  12. GRB 991208 Keck Spectroscopy
  13. GRB 991216: Extremely bright BATSE burst
  14. GRB991208, optical observations
  15. GRB991106: BeppoSAX/BATSE results
  16. BeppoSAX NFI Observation of GRB991106
  17. GRB 991105: BATSE Observations
  18. GRB 991106 Optical Observations
  19. GRB991014 BATSE Observations
  20. BATSE GRB trigger criteria
  21. GRB990806: BATSE Observations
  22. Late-time HST/STIS Observations of GRB 990510
  23. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  24. GRB 990510: BATSE Observations
  25. GRB 990510 Optical Observations
  26. GRB 990506: BATSE Observations
  27. GRB 990506, Optical Observations
  28. GRB 990506 optical observations
  29. GRB 990506 optical observations
  30. GRB 990316 optical observations
  31. GRB990123, 15-GHz limits
  32. GRB 990123: BATSE Observations
  33. GRB 990123 Optical Follow-up
  34. GRB981220, Optical Observations
  35. GRB 981220:Optical Observations
  36. GRB 981226 - Infrared Observations
  37. GRB 980326/Host Galaxy
  38. GRB 980923 BATSE Observations
  39. GRB980703, Host galaxy multicolor photometry
  40. GRB 980703: BATSE Observations
  41. GRB 980613: BATSE Observations
  42. SGR1900+14
  43. SGR1900+14
  44. GRB980519 BATSE Observations
  45. BATSE on-board GRB trigger change
  46. GRB980425 BATSE observations
  47. GRB980329
  48. GRB 971214: KPNO Optical Observations
  49. GRB 970228: Keck/LRIS Optical Observations

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Download all Circulars as a .tar.gz archive:
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