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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"

26119 results found.

  1. Swift-BAT Trigger 115881 is not a real GRB
  2. Swift/BAT possible detection of a weak burst GRB050430
  3. GRB 050401: Rc observation
  4. GRB050416a: Radio Detection
  5. GRB 050422: Swift-UVOT observation
  6. GRB 050422: Swift-BAT refined analysis
  7. GRB 050422: Swift XRT Position
  8. Swift Detection of GRB 050422
  9. GRB 050421: NIR observations
  10. GRB 050416: Optical/NIR observations
  11. GRB 050421: SLOTIS observations
  12. GRB 050421: Further Analysis of IR imaging
  13. GRB050421: Radio Observations
  14. GRB050421: Radio Observations
  15. GRB 050421: Swift-UVOT observation
  16. GRB 050421: IR Observations
  17. GRB 050421: Swift-BAT refined analysis
  18. GRB 050421: ROTSE-III Optical Limits
  19. GRB 050421: NIR observations re-examination
  20. GRB 050421: early Swift XRT analysis results
  21. GRB 050421: NIR observations
  22. GRB050421: P60 Observations
  23. GRB 050421: BOOTES-2 simultaneous optical observations
  24. GRB 050421: Optical observations at the INT
  25. Swift Detection of GRB050421
  26. GRB 050416b: Tentative Swift XRT Position
  27. GRB 050315: potential host galaxy
  28. GRB050326: analysis of the XMM-Newton observation
  29. GRB 050412: Chandra observations
  30. GRB 050418: Swift-BAT refined analysis
  31. Swift-BAT detection of the bright and long GRB 050418
  32. GRB 050416: Mitsume optical observation
  33. GRB 050416 : optical observation at Xinglong observatory
  34. GRB 050416B: optical observations
  35. GRB 050416b: Swift-BAT refined analysis
  36. GRB 050416: Swift/UVOT refined analysis
  37. Swift-BAT detection of GRB 050416b
  38. GRB050412: Radio Observations
  39. GRB 050416: Swift/UVOT detection of afterglow emission
  40. GRB050416: Refined Swift-XRT analysis
  41. GRB050416: Maidanak optical observations
  42. GRB 050416: Swift-BAT refined analysis
  43. GRB 050416: ART observations
  44. GRB 050416,optical observation
  45. GRB 050416: KAIT observations
  46. GRB050416: P200 NIR Observations
  47. GRB 050416: Swift XRT Position
  48. GRB 050416: Radio observations
  49. Confirmation of OT for GRB050416
  50. GRB050416: P60 Afterglow Candidate
  51. Swift BAT/XRT Detection of GRB 050416
  52. GRB 050412: Subaru observations
  53. GRB050408: optical observation
  54. GRB 050412: PROMPT VRcIc Observations
  55. GRB 050412: optical limit
  56. GRB 050412: optical observations
  57. GRB 050408: refined XRT analysis, no jet break seen yet
  58. GRB 050412: early Swift XRT analysis results
  59. GRB 050412 : XingLong optical observation
  60. GRB 050412: Swift-BAT refined analysis
  61. GRB 050412: ANU 2.3m observations
  62. GRB 050412: Early Optical/Ultraviolet Observations with
  63. GRB 050412: retraction of UVOT transient report
  64. GRB 050412: UVOT transient not in XRT error circle
  65. GRB 050412: LCO Optical Observations
  66. GRB 050412: Optical observations
  67. GRB050412: P60 Observations
  68. GRB 050412: Swift XRT Position
  69. GRB050412: optical limit before and during GRB
  70. GRB050412: ROTSE-III Optical Limits
  71. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  72. GRB 050412: IR Observations
  73. GRB050408: Radio Observations
  74. GRB 050401: Optical limit
  75. GRB 050408: Optical limit
  76. GRB050410: P60 Observations
  77. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  78. GRB 050410, optical observations
  79. GRB 050408: PROMPT VRcIc Observations
  80. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  81. GRB 050410 R band Optical Observations
  82. GRB050410 : Null detection report
  83. GRB 050410, optical observations
  84. GRB050410: Radio Observations
  85. GRB 050408: Swift XRT measurement of possible jet break
  86. GRB050410: MASTER optical observations
  87. GRB 050410: Early observations with Swift-UVOT
  88. Swift-BAT detection of GRB 050410
  89. GRB 050410: Swift XRT Position
  90. GRB 050408: Retraction of Proposed Host Galaxy
  91. GRB 050408: Inconsistency of host galaxy identification
  92. GRB 050408: Subaru Observations
  93. GRB 050408: WIDGET simultaneous optical observations
  94. GRB 050408: SOAR UBVRc Observations
  95. GRB 050408: Properties of the Host Galaxy
  96. GRB 050408: Mercator Optical Observations
  97. GRB050408: Radio Observations
  98. GRB 050408: Swift XRT analysis
  99. GRB 050408, SMARTS optical/IR afterglow observations
  100. GRB 050408: Optical limit at 20 min after the burst

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