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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"

32688 results found.

  1. GRB 050502a: RBO Observations
  2. GRB 050502A: WSRT Radio Observations
  3. GRB050502A: Optical Observations
  4. GRB050502B Swift-BAT refined analysis
  5. GRB050502B: I band source in XRT error circle
  6. Swift UVOT refined analysis
  7. Retraction of Swift-BAT trigger 116145
  8. GRB 050502a : R band observation at Lulin observatory
  9. GRB 050502b : optical observation at Lulin observatory
  10. GRB 050502b: Swift XRT Position
  11. GRB050502B: Optical Limits from ANU 1m
  12. GRB 050502: INTEGRAL results
  13. GRB050502: ANU 1m optical Observations
  14. GRB 050502: Confirmed variability of the afterglow candidate +
  15. GRB 050502: PAIRITEL IR Observations
  16. GRB 050502: ROTSE-III Detection of Possible Counterpart
  17. Swift-BAT Trigger 115881 is not a real GRB
  18. Swift/BAT possible detection of a weak burst GRB050430
  19. GRB 050401: Rc observation
  20. GRB050416a: Radio Detection
  21. GRB 050422: Swift-UVOT observation
  22. GRB 050422: Swift-BAT refined analysis
  23. GRB 050422: Swift XRT Position
  24. GRB 050421: NIR observations
  25. GRB 050416: Optical/NIR observations
  26. GRB 050421: SLOTIS observations
  27. GRB 050421: Further Analysis of IR imaging
  28. GRB050421: Radio Observations
  29. GRB050421: Radio Observations
  30. GRB 050421: Swift-UVOT observation
  31. GRB 050421: IR Observations
  32. GRB 050421: Swift-BAT refined analysis
  33. GRB 050421: ROTSE-III Optical Limits
  34. GRB 050421: NIR observations re-examination
  35. GRB050421
  36. GRB 050421: early Swift XRT analysis results
  37. GRB 050421: NIR observations
  38. GRB050421: P60 Observations
  39. GRB 050421: BOOTES-2 simultaneous optical observations
  40. GRB 050421: Optical observations at the INT
  41. Swift Detection of GRB050421
  42. GRB 050416b: Tentative Swift XRT Position
  43. GRB 050315: potential host galaxy
  44. GRB050418: Null Optical Observations
  45. GRB 050412: Chandra observations
  46. GRB050416A, optical observations
  47. GRB 050418: Swift-BAT refined analysis
  48. GRB 050416: Mitsume optical observation
  49. GRB 050416 : optical observation at Xinglong observatory
  50. GRB 050416B: optical observations
  51. GRB 050416b: Swift-BAT refined analysis
  52. GRB 050416b: LCO observations
  53. GRB 050416b: LCO observations
  54. GRB050416B: IR observations
  55. GRB 050416: Swift/UVOT refined analysis
  56. GRB050412: Radio Observations
  57. GRB 050416: Swift/UVOT detection of afterglow emission
  58. GRB050416: Refined Swift-XRT analysis
  59. GRB 050416: Swift-BAT refined analysis
  60. GRB 050416: ART observations
  61. GRB 050416: KAIT observations
  62. GRB050416: P200 NIR Observations
  63. GRB 050416: Swift XRT Position
  64. GRB 050416: Radio observations
  65. GRB 050412: Subaru observations
  66. GRB 050408: RTT150 optical observations
  67. GRB050408: optical observation
  68. GRB 050412: PROMPT VRcIc Observations
  69. GRB 050408: Kuiper 1.5m observations
  70. GRB 050412: optical limit
  71. GRB 050412: optical observations
  72. GRB 050408: refined XRT analysis, no jet break seen yet
  73. GRB 050412: early Swift XRT analysis results
  74. GRB 050412 : XingLong optical observation
  75. GRB 050412: Swift-BAT refined analysis
  76. GRB 050412: ANU 2.3m observations
  77. GRB 050412: Early Optical/Ultraviolet Observations with
  78. GRB 050412: retraction of UVOT transient report
  79. GRB 050412: Optical limit
  80. GRB 050412: LCO Optical Observations
  81. GRB 050412: Optical observations
  82. GRB050412: P60 Observations
  83. GRB 050412: Swift XRT Position
  84. GRB050412: optical limit before and during GRB
  85. GRB 050412: LCO optical observations
  86. GRB050412: ROTSE-III Optical Limits
  87. GRB050408: Radio Observations
  88. GRB 050401: Optical limit
  89. GRB 050408: Optical limit
  90. GRB050410: P60 Observations
  91. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  92. GRB 050410, optical observations
  93. GRB 050408: PROMPT VRcIc Observations
  94. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  95. GRB050410 : Null detection report
  96. GRB 050410, optical observations
  97. GRB050410: Radio Observations
  98. GRB 050410: Early observations with Swift-UVOT
  99. Swift-BAT detection of GRB 050410
  100. GRB 050408: Retraction of Proposed Host Galaxy

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