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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32582 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. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  6. GRB 081215A: Gamma Repeater?
  7. Possible GRB 081211B: Swift/UVOT Upper Limits
  8. GRB 081210: optical observations
  9. Possible GRB 081211B - Swift-XRT analysis
  10. GRB 081209: Fermi GBM detection
  11. GRB 081007: Detection of a Supernova
  12. GRB 081210: Xinglong TNT R band Upper Limits
  13. GRB 081210, SMARTS optical/IR observations
  14. GRB 081211: Swift-BAT refined analysis
  15. GRB 081211: Swift XRT refined analysis
  16. GRB 081211: Swift/UVOT detection of an optical afterglow
  17. GRB 081210: Swift/UVOT refined analysis
  18. GRB 081210: Swift-XRT refined analysis
  19. GRB081203B: optical observations
  20. GRB 081210: Swift-BAT refined analysis
  21. Konus-Wind observation of GRB 081209
  22. GRB 081203A: optical observations
  23. Radio observation of GRB 081121 with ATCA
  24. Radio observation of GRB 081118 with ATCA
  25. GRB 081128: afterglow observations
  26. GRB 081203B: Suzaku WAM observation of the prompt emission
  27. GRB 081203B: Additional Gemini imaging
  28. Radio observation of GRB 081109 with ATCA
  29. Radio observation of GRB 081104 with ATCA
  30. Radio observation of GRB 081029 with ATCA
  31. Radio observation of GRB 081008 with ATCA
  32. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  33. GRB 081203B: Gemini observations
  34. GRB 081128: optical observation in CrAO
  35. GRB081203A: Optical observations at Ishigaki
  36. GRB 081128: Optical afterglow observations
  37. GRB 081204: GROND Observations
  38. GRB081203B: optical observations
  39. Radio detection of GRB 081203B with the VLA
  40. GRB 081204: Magellan observations
  41. GRB081203A: Radio upper limit at 15 GHz
  42. GRB 081204: Swift/UVOT Upper Limits
  43. GRB 081204: Swift XRT afterglow confirmation
  44. GRB081203A: MITSuME optical observation
  45. GRB 081203A: Optical observations of Xinglong TNT telescope
  46. GRB 081203A: Skynet/GORT Detections
  47. GRB 081204: Swift XRT afterglow candidate
  48. GRB081203A: optical observation
  49. GRB 081204 : a long GRB localized by INTEGRAL
  50. VLA Radio upper limit on GRB 081203A
  51. Swift-XRT observations of GRB 081203B
  52. Konus-Wind observation of GRB 081203A
  53. Konus-Wind observation of GRB 081203B
  54. GRB081203A: Swift-XRT refined analysis
  55. GRB 081203B: optical observations
  56. Swift/UVOT detection of GRB081203B
  57. GRB 081203B: Swift-XRT candidate afterglow.
  58. GRB 081203A: optical observations
  59. Swift UVOT observations of GRB 081203A
  60. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  61. GRB081203A: Swift/UVOT grism redshift
  62. GRB 081203A: Burst detection from Swift-BAT slew data
  63. GRB 081203A: Swift-BAT refined analysis
  64. GRB 081130B: MASTER prompt optical observations
  65. GRB081203: optical observation
  66. GRB 081128: optical observation
  67. Swift Trigger 335971: Swift/UVOT Observations
  68. GRB 081126: afterglow photometry
  69. GRB 081126: Fermi GBM detection
  70. VLA Radio upper limit on GRB 081126
  71. GRB 081128A: optical observations
  72. GRB081128: Swift/UVOT Upper Limits
  73. SGR 1806-20: Fermi GBM detection.
  74. GRB 081128: Swift-XRT refined analysis
  75. GRB 081128: Liverpool Telescope afterglow confirmation
  76. GRB081128: optical observations
  77. GRB081128 : Lulin optical follow-ups
  78. GRB 081128: Swift-BAT refined analysis
  79. GRB 081128: Optical observation of xinglong TNT
  80. GRB081126: Afterglow photometry from Crni Vrh
  81. GRB 081127: Swift/UVOT Upper Limits
  82. GRB 081127: Swift-XRT refined analysis
  83. GRB 081126: Confirmation of the Optical Afterglow
  84. GRB 081127: Swift-BAT refined analysis
  85. Konus-Wind observation of GRB 081126
  86. GRB 081126: Swift-XRT refined analysis
  87. GRB 081126: Swift/UVOT Observations
  88. GRB 081126: optical observations
  89. GRB 081126: Swift-BAT refined analysis
  90. Konus-Wind observation of GRB 081121
  91. GRB 081121, SMARTS optical/IR afterglow observations
  92. GRB081121: Fermi GBM detection
  93. GRB081121: Refined Swift/UVOT observations
  94. GRB 081121: Swift-XRT refined analysis
  95. GRB 081121: GROND observations
  96. GRB 081121: Swift-BAT refined analysis
  97. GRB081121: Swift/UVOT observations
  98. GRB 081121: ROTSE-III Detection of Optical Counterpart
  99. GRB081118 : optical upper limit
  100. GRB 081016b, SMARTS optical/IR observations

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