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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"

26343 results found.

  1. GRB 081216 : Fermi GBM observation
  2. GRB 081215A: Fermi GBM detection
  3. GRB 081211B - possibly a short burst with extended emission
  4. GRB 081118: Zadko observations
  5. GRB 081207: Fermi GBM detection
  6. GRB 081209: Fermi GBM detection
  7. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  8. GRB 081007: Detection of a Supernova
  9. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  10. GRB 081211: Swift-BAT refined analysis
  11. GRB 081211: Enhanced Swift-XRT position
  12. GRB 081211: Swift detection of a burst
  13. GRB 081210: Swift-XRT refined analysis
  14. GRB 081210: Enhanced Swift-XRT position
  15. GRB 081210: Swift-BAT refined analysis
  16. GRB 081210: Swift detection of a burst with optical afterglow
  17. Konus-Wind observation of GRB 081209
  18. GRB 081206C: Fermi GBM detection
  19. Radio observation of GRB 081121 with ATCA
  20. Radio observation of GRB 081118 with ATCA
  21. GRB 081206: Fermi GBM detection
  22. GRB 081128: afterglow observations
  23. GRB 081203B: Suzaku WAM observation of the prompt emission
  24. GRB 081203B: Additional Gemini imaging
  25. Radio observation of GRB 081109 with ATCA
  26. Radio observation of GRB 081104 with ATCA
  27. Radio observation of GRB 081029 with ATCA
  28. Radio observation of GRB 081008 with ATCA
  29. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  30. GRB 081128: Optical afterglow observations
  31. GRB 081204: GROND Observations
  32. Radio detection of GRB 081203B with the VLA
  33. GRB 081204B: Fermi GBM detection
  34. GRB 081204 : a long GRB localized by INTEGRAL
  35. VLA Radio upper limit on GRB 081203A
  36. Swift-XRT observations of GRB 081203B
  37. Konus-Wind observation of GRB 081203A
  38. Konus-Wind observation of GRB 081203B
  39. GRB081203A: Swift-XRT refined analysis
  40. GRB 081203B: optical observations
  41. GRB 081203A: optical observations
  42. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  43. GRB 081203A: Burst detection from Swift-BAT slew data
  44. GRB 081203A: Swift-BAT refined analysis
  45. GRB 081203: Enhanced Swift-XRT position
  46. GRB 081130B: MASTER prompt optical observations
  47. GRB081203: optical observation
  48. GRB 081203: Swift detection of a burst with a bright optical counterpart
  49. GRB 081130B: Fermi GBM detection
  50. GRB 081126: Fermi GBM detection
  51. VLA Radio upper limit on GRB 081126
  52. GRB 081129: Fermi GBM detection
  53. GRB 081128A: optical observations
  54. GRB 081122B: Fermi GBM Detection
  55. GRB 081128: Swift-XRT refined analysis
  56. GRB 081128: Liverpool Telescope afterglow confirmation
  57. GRB081128: optical observations
  58. GRB081128 : Lulin optical follow-ups
  59. GRB 081128: Swift-BAT refined analysis
  60. GRB 081128: Enhanced Swift-XRT position
  61. GRB 081128: Swift detection of a burst
  62. GRB081126: Afterglow photometry from Crni Vrh
  63. GRB 081126: GRT Optical Observation
  64. GRB 081127: Swift/UVOT Upper Limits
  65. GRB 081127: Swift-XRT refined analysis
  66. GRB 081127: Enhanced Swift-XRT position
  67. GRB 081126: Confirmation of the Optical Afterglow
  68. GRB 081127: Swift-BAT refined analysis
  69. Konus-Wind observation of GRB 081126
  70. GRB 081126: Swift-XRT refined analysis
  71. GRB 081127: Swift detection of a burst
  72. GRB 081126: Swift/UVOT Observations
  73. GRB 081126: optical observations
  74. GRB 081126: Swift-BAT refined analysis
  75. GRB 081126: Enhanced Swift-XRT position
  76. GRB 081126: TAROT Calern observatory optical observations
  77. GRB 081126: Swift detection of a burst
  78. GRB 081125: Fermi GBM detection
  79. GRB 081124: Fermi GBM detection
  80. GRB 081120: Fermi GBM detection
  81. GRB 081118: Fermi GBM detection.
  82. GRB 081122: Fermi GBM detection
  83. Konus-Wind observation of GRB 081121
  84. GRB081121: Refined Swift/UVOT observations
  85. GRB 081121: Swift-XRT refined analysis
  86. GRB 081121: Enhanced Swift-XRT position
  87. GRB 081121: GROND observations
  88. GRB 081121: Swift-BAT refined analysis
  89. GRB081121: Swift/UVOT observations
  90. GRB 081121: Swift detection of a burst
  91. GRB 081119: Fermi GBM detection
  92. VLA Radio upper limit on GRB 081118
  93. GRB 081118: Swift-XRT refined analysis
  94. GRB 081118: GROND detection of afterglow
  95. GRB 081118: Swift-BAT refined analysis
  96. GRB 081118: Enhanced Swift-XRT position
  97. GRB 081118: Swift detection of a burst
  98. GRB 081109A: confirmation of possible detection host galaxy
  99. Further Swift-XRT observations of the probable GRB 081105.
  100. GRB 081113: Fermi GBM detection

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