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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"

45908 results found.

  1. GRB 050422: Swift XRT Position
  2. Swift Detection of GRB 050422
  3. GRB 050421: NIR observations
  4. GRB 050416: Optical/NIR observations
  5. GRB 050421: SLOTIS observations
  6. GRB 050421: Further Analysis of IR imaging
  7. GRB050421: Radio Observations
  8. GRB050421: Radio Observations
  9. GRB 050421: Swift-UVOT observation
  10. GRB 050421: IR Observations
  11. GRB 050421: Swift-BAT refined analysis
  12. GRB 050421: ROTSE-III Optical Limits
  13. GRB 050421: NIR observations re-examination
  14. GRB050421
  15. GRB 050421: early Swift XRT analysis results
  16. GRB 050421: NIR observations
  17. GRB050421: P60 Observations
  18. GRB 050421: BOOTES-2 simultaneous optical observations
  19. GRB 050421: Optical observations at the INT
  20. Swift Detection of GRB050421
  21. GRB 050416b: Tentative Swift XRT Position
  22. GRB 050315: potential host galaxy
  23. GRB050326: analysis of the XMM-Newton observation
  24. GRB050418: Null Optical Observations
  25. GRB 050412: Chandra observations
  26. GRB050416A, optical observations
  27. GRB 050418: Swift-BAT refined analysis
  28. Swift-BAT detection of the bright and long GRB 050418
  29. GRB 050416: Mitsume optical observation
  30. GRB 050416 : optical observation at Xinglong observatory
  31. GRB 050416B: optical observations
  32. GRB 050416b: Swift-BAT refined analysis
  33. GRB 050416b: LCO observations
  34. GRB 050416b: LCO observations
  35. GRB050416B: IR observations
  36. GRB 050416: Swift/UVOT refined analysis
  37. Swift-BAT detection of GRB 050416b
  38. IBAS GRB Alert # 2463: not a GRB
  39. GRB050412: Radio Observations
  40. GRB 050416: Swift/UVOT detection of afterglow emission
  41. GRB050416: Refined Swift-XRT analysis
  42. GRB050416: Maidanak optical observations
  43. GRB 050416: Swift-BAT refined analysis
  44. GRB 050416: ART observations
  45. GRB 050416,optical observation
  46. GRB 050416: KAIT observations
  47. GRB050416: P200 NIR Observations
  48. GRB 050416: Swift XRT Position
  49. GRB 050416: Radio observations
  50. Confirmation of OT for GRB050416
  51. GRB050416: P60 Afterglow Candidate
  52. Swift BAT/XRT Detection of GRB 050416
  53. GRB 050412: Subaru observations
  54. GRB 050408: RTT150 optical observations
  55. GRB050408: optical observation
  56. GRB 050412: PROMPT VRcIc Observations
  57. GRB 050408: Kuiper 1.5m observations
  58. GRB 050412: optical limit
  59. GRB 050412: optical observations
  60. GRB 050408: refined XRT analysis, no jet break seen yet
  61. GRB 050412: early Swift XRT analysis results
  62. GRB 050412 : XingLong optical observation
  63. GRB 050412: Swift-BAT refined analysis
  64. GRB 050412: ANU 2.3m observations
  65. GRB 050412: Early Optical/Ultraviolet Observations with
  66. GRB 050412: retraction of UVOT transient report
  67. GRB 050412: UVOT transient not in XRT error circle
  68. GRB 050408: SDSS Field Calibration
  69. GRB 050412: Optical limit
  70. GRB 050412: LCO Optical Observations
  71. GRB 050412: Optical observations
  72. GRB050412: P60 Observations
  73. GRB 050412: Swift XRT Position
  74. GRB050412: optical limit before and during GRB
  75. GRB 050412: LCO optical observations
  76. GRB050412: ROTSE-III Optical Limits
  77. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  78. GRB 050412: IR and Optical observations
  79. GRB 050412: IR Observations
  80. GRB050408: Radio Observations
  81. GRB 050401: Optical limit
  82. GRB 050408: Optical limit
  83. GRB050410: P60 Observations
  84. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  85. GRB 050410, optical observations
  86. GRB 050408: PROMPT VRcIc Observations
  87. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  88. GRB 050410 R band Optical Observations
  89. GRB050410 : Null detection report
  90. GRB 050410, optical observations
  91. GRB050410: Radio Observations
  92. GRB 050408: Swift XRT measurement of possible jet break
  93. GRB050410: MASTER optical observations
  94. GRB 050410: Early observations with Swift-UVOT
  95. Swift-BAT detection of GRB 050410
  96. GRB 050410: Swift XRT Position
  97. GRB 050408: Retraction of Proposed Host Galaxy
  98. GRB 050408: Inconsistency of host galaxy identification
  99. GRB 050408: Subaru Observations
  100. GRB 050408: WIDGET simultaneous optical observations

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