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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"

11835 results found.

  1. GRB 090109: Fermi GBM detection
  2. GRB 090108B: Fermi GBM detection
  3. GRB 090108: Fermi GBM Detection
  4. GRB090107B: Fermi GBM Detection
  5. Fermi/GBM detection of GRB 081226A
  6. Fermi/GBM detection of GRB 081225
  7. GRB 081231: Fermi GBM Detection
  8. GRB 081229: Fermi GBM detection
  9. GRB 081226B: Fermi GBM observation
  10. GRB 081226C: Fermi GBM detection
  11. GRB 081224: Suzaku WAM observation of the prompt emission
  12. GRB 081224: Swift-XRT observation
  13. GRB 081224: Fermi GBM Detection & LAT Localization
  14. GRB 081223: Fermi GBM detection
  15. GRB 081221: GROND observations
  16. GRB 081222: Fermi GBM observation
  17. Fermi Gamma-ray Burst Monitor trigger 251687595 reclassification
  18. GRB 081204C: Fermi GBM detection
  19. Konus-Wind observation of very bright GRB 081215A
  20. GRB081221: Fermi GBM observation
  21. IPN triangulation of bright GRB 081215A
  22. GRB 081222: Swift detection of a burst with a bright optical afterglow
  23. GRB 081221: Swift detection of a burst
  24. GRB 081217: Fermi GBM detection
  25. GRB081215A: Fermi-LAT observations
  26. GRB 081215B: Fermi GBM detection
  27. GRB 081216: Suzaku WAM observation of the prompt emission
  28. GRB 081216 : Fermi GBM observation
  29. GRB 081215A: Fermi GBM detection (correction to event fluence)
  30. GRB 081215A: Fermi GBM detection
  31. IPN localization of short hard GRB 081216
  32. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  33. GRB 0811215A: MASTER prompt optical observations
  34. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  35. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  36. GRB 081213: Fermi GBM detection
  37. GRB 081207: Fermi GBM detection
  38. GRB 081209: Fermi GBM detection
  39. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  40. Konus-Wind observation of GRB 081209
  41. IPN triangulation of short hard GRB 081209
  42. GRB 081206C: Fermi GBM detection
  43. GRB 081206B: Fermi GBM detection
  44. GRB 081206: Fermi GBM detection
  45. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  46. GRB 081204B: Fermi GBM detection
  47. GRB 081130B: MASTER prompt optical observations
  48. GRB 081130B: Fermi GBM detection
  49. GRB 081130: Fermi GBM detection
  50. GRB 081126: Fermi GBM detection
  51. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  52. GRB 081129: Fermi GBM detection
  53. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  54. SGR 1806-20: Fermi GBM detection.
  55. GRB 081122B: Fermi GBM Detection
  56. GRB 081125: Fermi GBM detection
  57. GRB 081124: Fermi GBM detection
  58. GRB 081120: Fermi GBM detection
  59. GRB 081118: Fermi GBM detection.
  60. GRB 081122: Fermi GBM detection
  61. GRB081121: Fermi GBM detection
  62. Fermi GBM detection of a weak source
  63. GRB 081119: Fermi GBM detection
  64. GRB 081113: Fermi GBM detection
  65. GRB 081110: Fermi GBM detection
  66. GRB 081110: MASTER: first optical observations Fermi GRB
  67. GRB 081109: GROND redshift limit and host extinction
  68. GRB 081024B: Swift-XRT late-time observations
  69. GRB 081109: Fermi GBM detection
  70. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  71. SGR 1806-20: Fermi GBM detection
  72. GRB 081102B: Fermi GBM detection
  73. GRB 081105B: Fermi GBM detection
  74. GRB 081107: Fermi GBM detection
  75. GRB 081101B: Fermi GBM detection
  76. GRB 081025: Fermi GBM observation
  77. Fermi-GBM detection of a Solar Flare
  78. Fermi Detection of GRB 081102
  79. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  80. GRB 081024B: new Swift-XRT observations
  81. GRB 081024B: VLA radio observation
  82. GRB 081024B: Suzaku WAM observation of the prompt emission
  83. GRB 081028B: Fermi GBM detection
  84. GRB 081021: Fermi GBM detection
  85. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  86. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  87. GRB 081024B: Swift-XRT further observations
  88. Swift UVOT observations of GRB081024B
  89. GRB 081024B: Swift-XRT observations
  90. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  91. Fermi-LAT observation of GRB 081024B
  92. GRB 081009: Fermi GBM detection
  93. GRB 081012: GROND upper limits
  94. GRB 081012: Fermi GBM detection
  95. GRB 081007 and GRB 081007B: Fermi GBM detection
  96. GRB081006B: Fermi GBM detection
  97. GRB081006: Fermi GBM detection
  98. GRB081003C: GLAST Burst Monitor detection
  99. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  100. GRB 080928: Fermi GBM detection

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