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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"

21904 results found.

  1. GRB081203A: optical observation
  2. VLA Radio upper limit on GRB 081203A
  3. Konus-Wind observation of GRB 081203A
  4. Konus-Wind observation of GRB 081203B
  5. GRB 081203B: optical observations
  6. Swift/UVOT detection of GRB081203B
  7. GRB 081203B: Swift-XRT candidate afterglow.
  8. GRB 081203A: optical observations
  9. GRB 081203: Enhanced Swift-XRT position
  10. GRB 081130B: MASTER prompt optical observations
  11. GRB081203: optical observation
  12. GRB 081203: Swift detection of a burst with a bright optical counterpart
  13. Swift Trigger 335971: Swift/UVOT Observations
  14. GRB 081126: afterglow photometry
  15. VLA Radio upper limit on GRB 081126
  16. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  17. GRB 081128A: optical observations
  18. Trigger 335971: Swift possible detection of a burst
  19. GRB081128: Swift/UVOT Upper Limits
  20. GRB 081128: Swift-XRT refined analysis
  21. GRB 081128: Liverpool Telescope afterglow confirmation
  22. GRB081128: optical observations
  23. GRB 081128: Enhanced Swift-XRT position
  24. GRB 081128: Optical observation of xinglong TNT
  25. GRB 081128: Swift detection of a burst
  26. GRB081126: Afterglow photometry from Crni Vrh
  27. GRB 081126: GRT Optical Observation
  28. GRB 081127: Swift/UVOT Upper Limits
  29. GRB 081127: Enhanced Swift-XRT position
  30. GRB 081126: Swift-XRT refined analysis
  31. GRB 081127: Swift detection of a burst
  32. GRB 081126: Swift/UVOT Observations
  33. GRB 081126: optical observations
  34. GRB 081126: Enhanced Swift-XRT position
  35. GRB 081126: TAROT Calern observatory optical observations
  36. GRB 081126: Swift detection of a burst
  37. GRB 081120: Fermi GBM detection
  38. GRB 081122: Fermi GBM detection
  39. Konus-Wind observation of GRB 081121
  40. GRB 081121, SMARTS optical/IR afterglow observations
  41. GRB081121: Refined Swift/UVOT observations
  42. GRB 081121: Swift-XRT refined analysis
  43. GRB 081121: Enhanced Swift-XRT position
  44. GRB 081121: GROND observations
  45. GRB 081121: Swift-BAT refined analysis
  46. GRB081121: Swift/UVOT observations
  47. GRB081118 : optical upper limit
  48. VLA Radio upper limit on GRB 081118
  49. GRB 081118: Swift-XRT refined analysis
  50. GRB 081118: GROND detection of afterglow
  51. GRB 081118: optical afterglow candidate
  52. GRB 081118: Swift UVOT Upper Limits
  53. GRB 081118: Enhanced Swift-XRT position
  54. GRB 081118: Swift detection of a burst
  55. GRB 081109A: confirmation of possible detection host galaxy
  56. Further Swift-XRT observations of the probable GRB 081105.
  57. GRB 081102: RTT150 Optical observations
  58. GRB 081110: Fermi GBM detection
  59. GRB 081109: TAROT La Silla observatory optical observations
  60. GRB 081102: MASTER refind and final results
  61. GRB 081109: GROND redshift limit and host extinction
  62. GRB 081025: Swift-XRT further analysis
  63. GRB 081024B: Swift-XRT late-time observations
  64. GRB 081109B: Swift/UVOT refined analysis
  65. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  66. GRB 081109A, Swift-BAT refined analysis
  67. GRB 081109A: Swift-XRT refined analysis
  68. Swift-BAT Trigger 334129: possible burst
  69. GRB 081109: REM NIR afterglow detection
  70. GRB 081109: Swift detection of a burst
  71. SGR 1806-20: Fermi GBM detection
  72. GRB 081104: GROND found no Optical/NIR Afterglow
  73. GRB 081105: GROND Upper Limits
  74. Radio observation of GRB 080523 with ATCA
  75. Radio observation of GRB 080520 with ATCA
  76. GRB 081105: Observations from OSN
  77. Swift-XRT observations of GRB 081105
  78. GRB 081101B: Fermi GBM detection
  79. Radio observation of GRB 080516 with ATCA
  80. GRB 081105 Swift/BAT and IPN Localization
  81. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  82. GRB 081104: refined XRT analysis
  83. GRB 081104: Enhanced Swift-XRT position
  84. GRB081104: Swift/UVOT Upper Limits
  85. GRB 081104 : Faulkes Telescope South observations
  86. Radio observation of GRB 080130 with ATCA
  87. GRB 081102: MASTER prompt optical limit
  88. GRB 081102: Swift-XRT refined analysis
  89. GRB 081102: Swift/UVOT refined analysis
  90. GRB 081102: Enhanced Swift-XRT position
  91. Radio observation of GRB 080218b with ATCA
  92. Radio observation of GRB 080229a with ATCA
  93. GRB 081102: MASTER VWF promt observation
  94. GRB 081102: Swift detection of a burst
  95. SGR 0501+4516: optical observations in August
  96. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  97. GRB 081024B: BTA deep optical observations
  98. GRB 081024B: new Swift-XRT observations
  99. Radio observation of GRB 080229b with ATCA
  100. GRB 081024B: VLA radio observation

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