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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"

21471 results found.

  1. GRB 081211B - possibly a short burst with extended emission
  2. GRB 081118: Zadko observations
  3. Possible GRB 081211B: Swift/UVOT Upper Limits
  4. GRB 081210: optical observations
  5. Possible GRB 081211B - Swift-XRT analysis
  6. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  7. GRB 081211: Swift-BAT refined analysis
  8. GRB 081211: Swift XRT refined analysis
  9. GRB 081211: Swift/UVOT detection of an optical afterglow
  10. GRB 081211: Enhanced Swift-XRT position
  11. GRB 081210: Swift/UVOT refined analysis
  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. IPN triangulation of short hard GRB 081209
  18. Radio observation of GRB 081121 with ATCA
  19. GRB 081128: afterglow observations
  20. GRB 081203B: Suzaku WAM observation of the prompt emission
  21. Radio observation of GRB 081029 with ATCA
  22. Radio observation of GRB 081008 with ATCA
  23. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  24. GRB 081128: optical observation in CrAO
  25. GRB 081128: Optical afterglow observations
  26. GRB 081204: GROND Observations
  27. GRB 081204: Magellan observations
  28. GRB 081204: Swift/UVOT Upper Limits
  29. GRB 081204: Swift XRT afterglow confirmation
  30. GRB 081204: Swift XRT afterglow candidate
  31. Swift-XRT observations of GRB 081203B
  32. Konus-Wind observation of GRB 081203A
  33. Konus-Wind observation of GRB 081203B
  34. GRB081203A: Swift-XRT refined analysis
  35. GRB 081203B: optical observations
  36. Swift/UVOT detection of GRB081203B
  37. GRB 081203B: Swift-XRT candidate afterglow.
  38. GRB 081203A: optical observations
  39. Swift UVOT observations of GRB 081203A
  40. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  41. GRB081203A: Swift/UVOT grism redshift
  42. GRB 081203A: Burst detection from Swift-BAT slew data
  43. GRB 081203A: Swift-BAT refined analysis
  44. GRB 081203: Enhanced Swift-XRT position
  45. GRB081203: optical observation
  46. GRB 081203: Swift detection of a burst with a bright optical counterpart
  47. GRB 081128: optical observation
  48. Swift Trigger 335971: Swift/UVOT Observations
  49. GRB 081126: Fermi GBM detection
  50. GRB 081128A: optical observations
  51. Swift Trigger 335971 is probably not a real source
  52. Trigger 335971: Swift possible detection of a burst
  53. GRB081128: Swift/UVOT Upper Limits
  54. GRB 081128: Swift-XRT refined analysis
  55. GRB 081128: Liverpool Telescope afterglow confirmation
  56. GRB081128: optical observations
  57. GRB081128 : Lulin optical follow-ups
  58. GRB 081128: Swift-BAT refined analysis
  59. GRB 081128: Enhanced Swift-XRT position
  60. GRB 081128: Optical observation of xinglong TNT
  61. GRB 081128: Swift detection of a burst
  62. GRB 081126: Swift observations continuing
  63. GRB081126: Afterglow photometry from Crni Vrh
  64. GRB 081126: GRT Optical Observation
  65. GRB 081127: Swift/UVOT Upper Limits
  66. GRB 081127: Swift-XRT refined analysis
  67. GRB 081127: Enhanced Swift-XRT position
  68. GRB 081126: Confirmation of the Optical Afterglow
  69. GRB 081127: Swift-BAT refined analysis
  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. Konus-Wind observation of GRB 081121
  79. GRB081121: Fermi GBM detection
  80. GRB081121: Refined Swift/UVOT observations
  81. GRB 081121: Swift-XRT refined analysis
  82. GRB 081121: Enhanced Swift-XRT position
  83. GRB 081121: GROND observations
  84. GRB 081121: Swift-BAT refined analysis
  85. GRB081121: Swift/UVOT observations
  86. GRB 081121: Swift detection of a burst
  87. GRB 081121: ROTSE-III Detection of Optical Counterpart
  88. GRB081118 : optical upper limit
  89. GRB 081118: Swift-XRT refined analysis
  90. GRB 081118: GROND detection of afterglow
  91. GRB 081118: optical afterglow candidate
  92. GRB 081118: Swift UVOT Upper Limits
  93. GRB 081118: Swift-BAT refined analysis
  94. GRB 081118: Enhanced Swift-XRT position
  95. GRB 081118: Swift detection of a burst
  96. GRB 081109A: confirmation of possible detection host galaxy
  97. Further Swift-XRT observations of the probable GRB 081105.
  98. GRB 081102: RTT150 Optical observations
  99. GRB 081109: TAROT La Silla observatory optical observations
  100. GRB 081102: MASTER refind and final results

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