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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"

32720 results found.

  1. GRB 081203A: Swift-BAT refined analysis
  2. GRB 081130B: MASTER prompt optical observations
  3. GRB081203: optical observation
  4. GRB 081128: optical observation
  5. Swift Trigger 335971: Swift/UVOT Observations
  6. GRB 081126: afterglow photometry
  7. GRB 081126: Fermi GBM detection
  8. VLA Radio upper limit on GRB 081126
  9. GRB 081128A: optical observations
  10. GRB081128: Swift/UVOT Upper Limits
  11. SGR 1806-20: Fermi GBM detection.
  12. GRB 081128: Swift-XRT refined analysis
  13. GRB 081128: Liverpool Telescope afterglow confirmation
  14. GRB081128: optical observations
  15. GRB081128 : Lulin optical follow-ups
  16. GRB 081128: Swift-BAT refined analysis
  17. GRB 081128: Optical observation of xinglong TNT
  18. GRB081126: Afterglow photometry from Crni Vrh
  19. GRB 081127: Swift/UVOT Upper Limits
  20. GRB 081127: Swift-XRT refined analysis
  21. GRB 081126: Confirmation of the Optical Afterglow
  22. GRB 081127: Swift-BAT refined analysis
  23. Konus-Wind observation of GRB 081126
  24. GRB 081126: Swift-XRT refined analysis
  25. GRB 081126: Swift/UVOT Observations
  26. GRB 081126: optical observations
  27. GRB 081126: Swift-BAT refined analysis
  28. Konus-Wind observation of GRB 081121
  29. GRB 081121, SMARTS optical/IR afterglow observations
  30. GRB081121: Fermi GBM detection
  31. GRB081121: Refined Swift/UVOT observations
  32. GRB 081121: Swift-XRT refined analysis
  33. GRB 081121: GROND observations
  34. GRB 081121: Swift-BAT refined analysis
  35. GRB081121: Swift/UVOT observations
  36. GRB 081121: ROTSE-III Detection of Optical Counterpart
  37. GRB081118 : optical upper limit
  38. GRB 081016b, SMARTS optical/IR observations
  39. VLA Radio upper limit on GRB 081118
  40. GRB 081118: VLT redshift
  41. GRB 081118: Swift-XRT refined analysis
  42. GRB 081118: GROND detection of afterglow
  43. GRB 081118: optical afterglow candidate
  44. GRB 081118: Swift UVOT Upper Limits
  45. GRB 081118: Swift-BAT refined analysis
  46. GRB 081109A: confirmation of possible detection host galaxy
  47. Further Swift-XRT observations of the probable GRB 081105.
  48. GRB 081102: MASTER refind and final results
  49. GRB 081109: GROND redshift limit and host extinction
  50. GRB 081025: Swift-XRT further analysis
  51. GRB 081024B: Swift-XRT late-time observations
  52. Swift-BAT refined analysis of trigger 334129
  53. GRB 081109B: Swift/UVOT refined analysis
  54. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  55. GRB 081109A: Possible Swift-UVOT detection
  56. GRB 081109A: Faulkes Telescope South observations
  57. GRB 081109A, Swift-BAT refined analysis
  58. GRB 081109A: Swift-XRT refined analysis
  59. GRB 081109: Fermi GBM detection
  60. GRB 081109: Swift/UVOT upper limits
  61. GRB 081109A optical upper limit
  62. GRB 081109: REM NIR afterglow detection
  63. GRB 081028 - PAIRITEL NIR detection
  64. GRB 081104: GROND found no Optical/NIR Afterglow
  65. GRB 081105: GROND Upper Limits
  66. Radio observation of GRB 080523 with ATCA
  67. Radio observation of GRB 080520 with ATCA
  68. UVOT/Swift observations of GRB081105
  69. Swift-XRT observations of GRB 081105
  70. Radio observation of GRB 080516 with ATCA
  71. GRB 081025: Fermi GBM observation
  72. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  73. GRB 081104: refined XRT analysis
  74. GRB 081104: Swift-BAT refined analysis
  75. GRB081104: Swift/UVOT Upper Limits
  76. Fermi-GBM detection of a Solar Flare
  77. Fermi Detection of GRB 081102
  78. GRB 081104 : Faulkes Telescope South observations
  79. GRB 081104: Swift-XRT position
  80. Radio observation of GRB 080130 with ATCA
  81. GRB 081102: MASTER prompt optical limit
  82. GRB 081102: Swift-XRT refined analysis
  83. GRB 081102: Swift/UVOT refined analysis
  84. GRB 081102: Swift-BAT refined analysis
  85. Radio observation of GRB 080218b with ATCA
  86. Radio observation of GRB 080229a with ATCA
  87. GRB 081102: MASTER VWF promt observation
  88. GRB 081102: OPTIMA-Burst optical upper limit
  89. SGR 0501+4516: optical observations in August
  90. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  91. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  92. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  93. GRB 081024B: BTA deep optical observations
  94. GRB 081028: CrAO optical observations
  95. GRB 081024B: new Swift-XRT observations
  96. Radio observation of GRB 080229b with ATCA
  97. GRB 081029, SMARTS optical/IR afterglow observations
  98. GRB 081024B: VLA radio observation
  99. GRB 081029: PROMPT Detections
  100. GRB 081029: Redshift Confirmation from Gemini-South

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