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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"

32551 results found.

  1. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  2. GRB 081203B: Gemini observations
  3. GRB 081128: optical observation in CrAO
  4. GRB081203A: Optical observations at Ishigaki
  5. GRB 081128: Optical afterglow observations
  6. GRB 081204: GROND Observations
  7. GRB081203B: optical observations
  8. Radio detection of GRB 081203B with the VLA
  9. GRB 081204: Magellan observations
  10. GRB081203A: Radio upper limit at 15 GHz
  11. GRB 081204: Swift/UVOT Upper Limits
  12. GRB 081204: Swift XRT afterglow confirmation
  13. GRB081203A: MITSuME optical observation
  14. GRB 081203A: Optical observations of Xinglong TNT telescope
  15. GRB 081203A: Skynet/GORT Detections
  16. GRB 081204: Swift XRT afterglow candidate
  17. GRB081203A: optical observation
  18. GRB 081204 : a long GRB localized by INTEGRAL
  19. VLA Radio upper limit on GRB 081203A
  20. Swift-XRT observations of GRB 081203B
  21. Konus-Wind observation of GRB 081203A
  22. Konus-Wind observation of GRB 081203B
  23. GRB081203A: Swift-XRT refined analysis
  24. GRB 081203B: optical observations
  25. Swift/UVOT detection of GRB081203B
  26. GRB 081203B: Swift-XRT candidate afterglow.
  27. GRB 081203A: optical observations
  28. Swift UVOT observations of GRB 081203A
  29. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  30. GRB081203A: Swift/UVOT grism redshift
  31. GRB 081203A: Burst detection from Swift-BAT slew data
  32. GRB 081203A: Swift-BAT refined analysis
  33. GRB 081130B: MASTER prompt optical observations
  34. GRB081203: optical observation
  35. GRB 081128: optical observation
  36. Swift Trigger 335971: Swift/UVOT Observations
  37. GRB 081126: afterglow photometry
  38. GRB 081126: Fermi GBM detection
  39. VLA Radio upper limit on GRB 081126
  40. GRB 081128A: optical observations
  41. GRB081128: Swift/UVOT Upper Limits
  42. SGR 1806-20: Fermi GBM detection.
  43. GRB 081128: Swift-XRT refined analysis
  44. GRB 081128: Liverpool Telescope afterglow confirmation
  45. GRB081128: optical observations
  46. GRB081128 : Lulin optical follow-ups
  47. GRB 081128: Swift-BAT refined analysis
  48. GRB 081128: Optical observation of xinglong TNT
  49. GRB081126: Afterglow photometry from Crni Vrh
  50. GRB 081127: Swift/UVOT Upper Limits
  51. GRB 081127: Swift-XRT refined analysis
  52. GRB 081126: Confirmation of the Optical Afterglow
  53. GRB 081127: Swift-BAT refined analysis
  54. Konus-Wind observation of GRB 081126
  55. GRB 081126: Swift-XRT refined analysis
  56. GRB 081126: Swift/UVOT Observations
  57. GRB 081126: optical observations
  58. GRB 081126: Swift-BAT refined analysis
  59. Konus-Wind observation of GRB 081121
  60. GRB 081121, SMARTS optical/IR afterglow observations
  61. GRB081121: Fermi GBM detection
  62. GRB081121: Refined Swift/UVOT observations
  63. GRB 081121: Swift-XRT refined analysis
  64. GRB 081121: GROND observations
  65. GRB 081121: Swift-BAT refined analysis
  66. GRB081121: Swift/UVOT observations
  67. GRB 081121: ROTSE-III Detection of Optical Counterpart
  68. GRB081118 : optical upper limit
  69. GRB 081016b, SMARTS optical/IR observations
  70. VLA Radio upper limit on GRB 081118
  71. GRB 081118: VLT redshift
  72. GRB 081118: Swift-XRT refined analysis
  73. GRB 081118: GROND detection of afterglow
  74. GRB 081118: optical afterglow candidate
  75. GRB 081118: Swift UVOT Upper Limits
  76. GRB 081118: Swift-BAT refined analysis
  77. GRB 081109A: confirmation of possible detection host galaxy
  78. Further Swift-XRT observations of the probable GRB 081105.
  79. GRB 081102: MASTER refind and final results
  80. GRB 081109: GROND redshift limit and host extinction
  81. GRB 081025: Swift-XRT further analysis
  82. GRB 081024B: Swift-XRT late-time observations
  83. Swift-BAT refined analysis of trigger 334129
  84. GRB 081109B: Swift/UVOT refined analysis
  85. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  86. GRB 081109A: Possible Swift-UVOT detection
  87. GRB 081109A: Faulkes Telescope South observations
  88. GRB 081109A, Swift-BAT refined analysis
  89. GRB 081109A: Swift-XRT refined analysis
  90. GRB 081109: Fermi GBM detection
  91. GRB 081109: Swift/UVOT upper limits
  92. GRB 081109A optical upper limit
  93. GRB 081109: REM NIR afterglow detection
  94. GRB 081028 - PAIRITEL NIR detection
  95. GRB 081104: GROND found no Optical/NIR Afterglow
  96. GRB 081105: GROND Upper Limits
  97. Radio observation of GRB 080523 with ATCA
  98. Radio observation of GRB 080520 with ATCA
  99. UVOT/Swift observations of GRB081105
  100. Swift-XRT observations of GRB 081105

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