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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"

12288 results found.

  1. GRB 081130B: Fermi GBM detection
  2. GRB 081130: Fermi GBM detection
  3. GRB 081126: Fermi GBM detection
  4. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  5. GRB 081129: Fermi GBM detection
  6. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  7. SGR 1806-20: Fermi GBM detection.
  8. GRB 081122B: Fermi GBM Detection
  9. GRB 081125: Fermi GBM detection
  10. GRB 081124: Fermi GBM detection
  11. GRB 081120: Fermi GBM detection
  12. GRB 081118: Fermi GBM detection.
  13. GRB 081122: Fermi GBM detection
  14. GRB081121: Fermi GBM detection
  15. Fermi GBM detection of a weak source
  16. GRB 081119: Fermi GBM detection
  17. GRB 081113: Fermi GBM detection
  18. GRB 081110: Fermi GBM detection
  19. GRB 081110: MASTER: first optical observations Fermi GRB
  20. GRB 081109: GROND redshift limit and host extinction
  21. GRB 081024B: Swift-XRT late-time observations
  22. GRB 081109: Fermi GBM detection
  23. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  24. SGR 1806-20: Fermi GBM detection
  25. GRB 081102B: Fermi GBM detection
  26. GRB 081105B: Fermi GBM detection
  27. GRB 081107: Fermi GBM detection
  28. GRB 081101B: Fermi GBM detection
  29. GRB 081025: Fermi GBM observation
  30. Fermi-GBM detection of a Solar Flare
  31. Fermi Detection of GRB 081102
  32. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  33. GRB 081024B: new Swift-XRT observations
  34. GRB 081024B: VLA radio observation
  35. GRB 081024B: Suzaku WAM observation of the prompt emission
  36. GRB 081028B: Fermi GBM detection
  37. GRB 081021: Fermi GBM detection
  38. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  39. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  40. GRB 081024B: Swift-XRT further observations
  41. Swift UVOT observations of GRB081024B
  42. GRB 081024B: Swift-XRT observations
  43. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  44. Fermi-LAT observation of GRB 081024B
  45. GRB 081009: Fermi GBM detection
  46. GRB 081012: GROND upper limits
  47. GRB 081012: Fermi GBM detection
  48. GRB 081007 and GRB 081007B: Fermi GBM detection
  49. GRB081006B: Fermi GBM detection
  50. GRB081006: Fermi GBM detection
  51. GRB081003C: GLAST Burst Monitor detection
  52. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  53. GRB 080928: Fermi GBM detection
  54. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  55. GRB 080925: Suzaku WAM observation of the prompt emission
  56. GRB 080927: Fermi GBM detection
  57. GRB 080925: Fermi GBM Detection
  58. GRB 080920: Fermi GBM detection
  59. GRB 080913B: Fermi GBM detection
  60. GRB 080916C: Fermi GBM Spectral Analysis
  61. GRB 080916C: IRSF/SIRUS NIR Observation
  62. Fermi/GBM Data Now Available
  63. GRB 080916A: Fermi GBM detection
  64. GRB 080916C: Swift UVOT Refined Analysis
  65. GRB 080916C: Swift XRT refined analysis
  66. Konus-Wind observation of GRB 080916C
  67. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  68. GRB 080916C: Swift/XRT detection of possible afterglow
  69. GRB 080916C: Fermi LAT observation
  70. GRB 080916C: Fermi GBM Detection
  71. GRB 080912 : Fermi GBM detection
  72. GRB 080906B: Fermi GBM detection
  73. GRB 080905C: Fermi GBM detection
  74. Swift trigger 324362 (LS I +61 303 ?)
  75. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  76. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  77. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  78. GRB 080825C: Fermi GBM Spectral Analysis
  79. GRB080825C: Fermi-LAT observations
  80. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  81. GRB080823: Fermi Gamma-ray Burst Monitor detection
  82. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  83. GRB080825C: GLAST Burst Monitor detection
  84. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  85. GRB060908: optical observations
  86. GRB 060218: rebrightening
  87. GRB990705: No Evidence for Neutrino Signal
  88. GRB990705: Intriguing Positional Coincidences

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