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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"

38422 results found.

  1. GRB 081210: Xinglong TNT R band Upper Limits
  2. GRB 081210, SMARTS optical/IR observations
  3. GRB 081211: Swift XRT refined analysis
  4. GRB 081211: Swift/UVOT detection of an optical afterglow
  5. GRB 081211: Enhanced Swift-XRT position
  6. GRB 081210: Swift/UVOT refined analysis
  7. GRB 081211: Swift detection of a burst
  8. GRB 081210: Swift-XRT refined analysis
  9. GRB081203B: optical observations
  10. GRB 081210: Enhanced Swift-XRT position
  11. GRB 081210: Swift detection of a burst with optical afterglow
  12. Konus-Wind observation of GRB 081209
  13. IPN triangulation of short hard GRB 081209
  14. GRB 081203A: optical observations
  15. GRB 081206C: Fermi GBM detection
  16. GRB 081206B: Fermi GBM detection
  17. GRB 081206: Fermi GBM detection
  18. GRB 081128: afterglow observations
  19. GRB 081203B: Suzaku WAM observation of the prompt emission
  20. GRB 081203B: Additional Gemini imaging
  21. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  22. GRB 081128: optical observation in CrAO
  23. GRB 081128: Optical afterglow observations
  24. GRB 081204: GROND Observations
  25. GRB081203B: optical observations
  26. Radio detection of GRB 081203B with the VLA
  27. GRB 081204: Magellan observations
  28. GRB081203A: Radio upper limit at 15 GHz
  29. GRB 081204B: Fermi GBM detection
  30. GRB 081204: Swift/UVOT Upper Limits
  31. GRB 081204: Swift XRT afterglow confirmation
  32. GRB081203A: MITSuME optical observation
  33. GRB 081203A: Optical observations of Xinglong TNT telescope
  34. GRB 081204: Swift XRT afterglow candidate
  35. GRB081203A: optical observation
  36. GRB 081204 : a long GRB localized by INTEGRAL
  37. VLA Radio upper limit on GRB 081203A
  38. Swift-XRT observations of GRB 081203B
  39. Konus-Wind observation of GRB 081203A
  40. Konus-Wind observation of GRB 081203B
  41. GRB081203A: Swift-XRT refined analysis
  42. GRB 081203B: optical observations
  43. Swift/UVOT detection of GRB081203B
  44. GRB 081203B: Swift-XRT candidate afterglow.
  45. GRB 081203A: optical observations
  46. Swift UVOT observations of GRB 081203A
  47. GRB081203A: Swift/UVOT grism redshift
  48. GRB 081203: Enhanced Swift-XRT position
  49. GRB081203: optical observation
  50. GRB 081203: Swift detection of a burst with a bright optical counterpart
  51. GRB 081128: optical observation
  52. GRB 081130B: Fermi GBM detection
  53. GRB 081130: Fermi GBM detection
  54. Swift Trigger 335971: Swift/UVOT Observations
  55. GRB 081126: afterglow photometry
  56. GRB 081126: Fermi GBM detection
  57. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  58. VLA Radio upper limit on GRB 081126
  59. GRB 081129: Fermi GBM detection
  60. GRB 081128A: optical observations
  61. Swift Trigger 335971 is probably not a real source
  62. Trigger 335971: Swift possible detection of a burst
  63. GRB081128: Swift/UVOT Upper Limits
  64. SGR 1806-20: Fermi GBM detection.
  65. GRB 081122B: Fermi GBM Detection
  66. GRB 081128: Swift-XRT refined analysis
  67. GRB 081128: Liverpool Telescope afterglow confirmation
  68. GRB081128: optical observations
  69. GRB081128 : Lulin optical follow-ups
  70. GRB 081128: Enhanced Swift-XRT position
  71. GRB 081128: Optical observation of xinglong TNT
  72. GRB 081128: Swift detection of a burst
  73. GRB 081126: Swift observations continuing
  74. GRB081126: Afterglow photometry from Crni Vrh
  75. GRB 081127: Swift/UVOT Upper Limits
  76. GRB 081127: Swift-XRT refined analysis
  77. GRB 081127: Enhanced Swift-XRT position
  78. GRB 081126: Confirmation of the Optical Afterglow
  79. Konus-Wind observation of GRB 081126
  80. GRB 081126: Swift-XRT refined analysis
  81. GRB 081127: Swift detection of a burst
  82. GRB 081126: Swift/UVOT Observations
  83. GRB 081126: optical observations
  84. GRB 081126: Enhanced Swift-XRT position
  85. GRB 081126: Swift detection of a burst
  86. GRB 081125: Fermi GBM detection
  87. GRB 081124: Fermi GBM detection
  88. GRB 081120: Fermi GBM detection
  89. GRB 081118: Fermi GBM detection.
  90. GRB 081122: Fermi GBM detection
  91. Konus-Wind observation of GRB 081121
  92. GRB 081121, SMARTS optical/IR afterglow observations
  93. GRB081121: Fermi GBM detection
  94. Fermi GBM detection of a weak source
  95. GRB081121: Refined Swift/UVOT observations
  96. GRB 081121: Swift-XRT refined analysis
  97. GRB 081121: Magellan Redshift
  98. GRB 081121: Enhanced Swift-XRT position
  99. GRB 081121: GROND observations
  100. GRB081121: Swift/UVOT observations

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