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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"

32693 results found.

  1. GRB 050504, R band Observations
  2. GRB050504: P60 Observations
  3. GRB 050502b, Optical observations
  4. GRB050502a: P60 Observations (Correction)
  5. GRB050502a: P60 Observations
  6. GRB 050502a: RBO Observations
  7. GRB 050502A: WSRT Radio Observations
  8. GRB050502A: Optical Observations
  9. GRB050502B Swift-BAT refined analysis
  10. GRB050502B: I band source in XRT error circle
  11. Swift UVOT refined analysis
  12. Retraction of Swift-BAT trigger 116145
  13. GRB 050502a : R band observation at Lulin observatory
  14. GRB 050502b : optical observation at Lulin observatory
  15. GRB 050502b: Swift XRT Position
  16. GRB050502B: Optical Limits from ANU 1m
  17. GRB 050502: INTEGRAL results
  18. GRB050502: ANU 1m optical Observations
  19. GRB 050502: Confirmed variability of the afterglow candidate +
  20. GRB 050502: PAIRITEL IR Observations
  21. GRB 050502: ROTSE-III Detection of Possible Counterpart
  22. Swift-BAT Trigger 115881 is not a real GRB
  23. Swift/BAT possible detection of a weak burst GRB050430
  24. GRB 050401: Rc observation
  25. GRB050416a: Radio Detection
  26. GRB 050422: Swift-UVOT observation
  27. GRB 050422: Swift-BAT refined analysis
  28. GRB 050422: Swift XRT Position
  29. GRB 050421: NIR observations
  30. GRB 050416: Optical/NIR observations
  31. GRB 050421: SLOTIS observations
  32. GRB 050421: Further Analysis of IR imaging
  33. GRB050421: Radio Observations
  34. GRB050421: Radio Observations
  35. GRB 050421: Swift-UVOT observation
  36. GRB 050421: IR Observations
  37. GRB 050421: Swift-BAT refined analysis
  38. GRB 050421: ROTSE-III Optical Limits
  39. GRB 050421: NIR observations re-examination
  40. GRB050421
  41. GRB 050421: early Swift XRT analysis results
  42. GRB 050421: NIR observations
  43. GRB050421: P60 Observations
  44. GRB 050421: BOOTES-2 simultaneous optical observations
  45. GRB 050421: Optical observations at the INT
  46. Swift Detection of GRB050421
  47. GRB 050416b: Tentative Swift XRT Position
  48. GRB 050315: potential host galaxy
  49. GRB050418: Null Optical Observations
  50. GRB 050412: Chandra observations
  51. GRB050416A, optical observations
  52. GRB 050418: Swift-BAT refined analysis
  53. GRB 050416: Mitsume optical observation
  54. GRB 050416 : optical observation at Xinglong observatory
  55. GRB 050416B: optical observations
  56. GRB 050416b: Swift-BAT refined analysis
  57. GRB 050416b: LCO observations
  58. GRB 050416b: LCO observations
  59. GRB050416B: IR observations
  60. GRB 050416: Swift/UVOT refined analysis
  61. GRB050412: Radio Observations
  62. GRB 050416: Swift/UVOT detection of afterglow emission
  63. GRB050416: Refined Swift-XRT analysis
  64. GRB 050416: Swift-BAT refined analysis
  65. GRB 050416: ART observations
  66. GRB 050416: KAIT observations
  67. GRB050416: P200 NIR Observations
  68. GRB 050416: Swift XRT Position
  69. GRB 050416: Radio observations
  70. GRB 050412: Subaru observations
  71. GRB 050408: RTT150 optical observations
  72. GRB050408: optical observation
  73. GRB 050412: PROMPT VRcIc Observations
  74. GRB 050408: Kuiper 1.5m observations
  75. GRB 050412: optical limit
  76. GRB 050412: optical observations
  77. GRB 050408: refined XRT analysis, no jet break seen yet
  78. GRB 050412: early Swift XRT analysis results
  79. GRB 050412 : XingLong optical observation
  80. GRB 050412: Swift-BAT refined analysis
  81. GRB 050412: ANU 2.3m observations
  82. GRB 050412: Early Optical/Ultraviolet Observations with
  83. GRB 050412: retraction of UVOT transient report
  84. GRB 050412: Optical limit
  85. GRB 050412: LCO Optical Observations
  86. GRB 050412: Optical observations
  87. GRB050412: P60 Observations
  88. GRB 050412: Swift XRT Position
  89. GRB050412: optical limit before and during GRB
  90. GRB 050412: LCO optical observations
  91. GRB050412: ROTSE-III Optical Limits
  92. GRB050408: Radio Observations
  93. GRB 050401: Optical limit
  94. GRB 050408: Optical limit
  95. GRB050410: P60 Observations
  96. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  97. GRB 050410, optical observations
  98. GRB 050408: PROMPT VRcIc Observations
  99. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  100. GRB050410 : Null detection report

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