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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"

31672 results found.

  1. GRB 081007: Detection of a Supernova
  2. GRB 081210: Xinglong TNT R band Upper Limits
  3. GRB 081210, SMARTS optical/IR observations
  4. GRB 081211: Swift-BAT refined analysis
  5. GRB 081211: Swift XRT refined analysis
  6. GRB 081211: Swift/UVOT detection of an optical afterglow
  7. GRB 081210: Swift/UVOT refined analysis
  8. GRB 081210: Swift-XRT refined analysis
  9. GRB081203B: optical observations
  10. GRB 081210: Swift-BAT refined analysis
  11. Konus-Wind observation of GRB 081209
  12. GRB 081203A: optical observations
  13. Radio observation of GRB 081121 with ATCA
  14. Radio observation of GRB 081118 with ATCA
  15. GRB 081128: afterglow observations
  16. GRB 081203B: Suzaku WAM observation of the prompt emission
  17. GRB 081203B: Additional Gemini imaging
  18. Radio observation of GRB 081109 with ATCA
  19. Radio observation of GRB 081104 with ATCA
  20. Radio observation of GRB 081029 with ATCA
  21. Radio observation of GRB 081008 with ATCA
  22. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  23. GRB 081203B: Gemini observations
  24. GRB 081128: optical observation in CrAO
  25. GRB081203A: Optical observations at Ishigaki
  26. GRB 081128: Optical afterglow observations
  27. GRB 081204: GROND Observations
  28. GRB081203B: optical observations
  29. Radio detection of GRB 081203B with the VLA
  30. GRB 081204: Magellan observations
  31. GRB081203A: Radio upper limit at 15 GHz
  32. GRB 081204: Swift/UVOT Upper Limits
  33. GRB 081204: Swift XRT afterglow confirmation
  34. GRB081203A: MITSuME optical observation
  35. GRB 081203A: Optical observations of Xinglong TNT telescope
  36. GRB 081203A: Skynet/GORT Detections
  37. GRB 081204: Swift XRT afterglow candidate
  38. GRB081203A: optical observation
  39. GRB 081204 : a long GRB localized by INTEGRAL
  40. VLA Radio upper limit on GRB 081203A
  41. Swift-XRT observations of GRB 081203B
  42. Konus-Wind observation of GRB 081203A
  43. Konus-Wind observation of GRB 081203B
  44. GRB081203A: Swift-XRT refined analysis
  45. GRB 081203B: optical observations
  46. Swift/UVOT detection of GRB081203B
  47. GRB 081203B: Swift-XRT candidate afterglow.
  48. GRB 081203A: optical observations
  49. Swift UVOT observations of GRB 081203A
  50. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  51. GRB081203A: Swift/UVOT grism redshift
  52. GRB 081203A: Burst detection from Swift-BAT slew data
  53. GRB 081203A: Swift-BAT refined analysis
  54. GRB 081130B: MASTER prompt optical observations
  55. GRB081203: optical observation
  56. GRB 081128: optical observation
  57. Swift Trigger 335971: Swift/UVOT Observations
  58. GRB 081126: afterglow photometry
  59. GRB 081126: Fermi GBM detection
  60. VLA Radio upper limit on GRB 081126
  61. GRB 081128A: optical observations
  62. GRB081128: Swift/UVOT Upper Limits
  63. SGR 1806-20: Fermi GBM detection.
  64. GRB 081128: Swift-XRT refined analysis
  65. GRB 081128: Liverpool Telescope afterglow confirmation
  66. GRB081128: optical observations
  67. GRB081128 : Lulin optical follow-ups
  68. GRB 081128: Swift-BAT refined analysis
  69. GRB 081128: Optical observation of xinglong TNT
  70. GRB081126: Afterglow photometry from Crni Vrh
  71. GRB 081127: Swift/UVOT Upper Limits
  72. GRB 081127: Swift-XRT refined analysis
  73. GRB 081126: Confirmation of the Optical Afterglow
  74. GRB 081127: Swift-BAT refined analysis
  75. Konus-Wind observation of GRB 081126
  76. GRB 081126: Swift-XRT refined analysis
  77. GRB 081126: Swift/UVOT Observations
  78. GRB 081126: optical observations
  79. GRB 081126: Swift-BAT refined analysis
  80. Konus-Wind observation of GRB 081121
  81. GRB 081121, SMARTS optical/IR afterglow observations
  82. GRB081121: Fermi GBM detection
  83. GRB081121: Refined Swift/UVOT observations
  84. GRB 081121: Swift-XRT refined analysis
  85. GRB 081121: GROND observations
  86. GRB 081121: Swift-BAT refined analysis
  87. GRB081121: Swift/UVOT observations
  88. GRB 081121: ROTSE-III Detection of Optical Counterpart
  89. GRB081118 : optical upper limit
  90. GRB 081016b, SMARTS optical/IR observations
  91. VLA Radio upper limit on GRB 081118
  92. GRB 081118: VLT redshift
  93. GRB 081118: Swift-XRT refined analysis
  94. GRB 081118: GROND detection of afterglow
  95. GRB 081118: optical afterglow candidate
  96. GRB 081118: Swift UVOT Upper Limits
  97. GRB 081118: Swift-BAT refined analysis
  98. GRB 081109A: confirmation of possible detection host galaxy
  99. Further Swift-XRT observations of the probable GRB 081105.
  100. GRB 081102: MASTER refind and final results

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