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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"

45898 results found.

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

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