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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"

6659 results found.

  1. GRB 001109: deep JHK upper limits
  2. GRB 001105, R-band observation
  3. V,R,I band observations of GRB000926
  4. The Likely Optical/Infrared Afterglow of GRB 001011
  5. GRB000911, Radio and Optical observations
  6. SGR 1806-20 burst activity
  7. GRB000630: Optical observations
  8. GRB000615, R-band photometry
  9. GRB 000418: Detection of the Host Galaxy
  10. X-ray Afterglow of GRB 000529
  11. GRB 000528 Optical Observations
  12. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  13. GRB000301C, Radio observations
  14. GRB000301C, Radio observations
  15. GRB 000210: BATSE Observations
  16. BATSE GRB trigger criteria changed
  17. BATSE Observations of GRB000115
  18. GRB 991216: Updated BATSE parameters
  19. IR observations of GRB991216
  20. GRB 991216 Radio Observations
  21. GRB 991208 SAO-RAS Spectroscopy
  22. GRB 991208 Keck Spectroscopy
  23. GRB 991216: Extremely bright BATSE burst
  24. GRB991208, optical observations
  25. GRB991106: BeppoSAX/BATSE results
  26. BeppoSAX NFI Observation of GRB991106
  27. GRB 991105: BATSE Observations
  28. GRB 991106 Optical Observations
  29. GRB991014 BATSE Observations
  30. BATSE GRB trigger criteria
  31. GRB990806: BATSE Observations
  32. Late-time HST/STIS Observations of GRB 990510
  33. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  34. GRB 990510: BATSE Observations
  35. GRB 990510 Optical Observations
  36. GRB 990506: BATSE Observations
  37. GRB 990506, Optical Observations
  38. GRB 990506 optical observations
  39. GRB 990506 optical observations
  40. GRB 990316 optical observations
  41. GRB990123, 15-GHz limits
  42. GRB 990123: BATSE Observations
  43. GRB 990123 Optical Follow-up
  44. GRB981220, Optical Observations
  45. GRB 981220:Optical Observations
  46. GRB 981226 - Infrared Observations
  47. GRB 980326/Host Galaxy
  48. GRB 980923 BATSE Observations
  49. GRB980703, Host galaxy multicolor photometry
  50. GRB 980703: BATSE Observations
  51. GRB 980613: BATSE Observations
  52. SGR1900+14
  53. SGR1900+14
  54. GRB980519 BATSE Observations
  55. BATSE on-board GRB trigger change
  56. GRB980425 BATSE observations
  57. GRB980329
  58. GRB 971214: KPNO Optical Observations
  59. GRB 970228: Keck/LRIS Optical Observations

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