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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"

37945 results found.

  1. Swift UVOT observation of GRB 050504
  2. GRB 050504, R band Observations
  3. GRB 050502b, V band Observations
  4. GRB050504: P60 Observations
  5. GRB 050504: A long GRB detected with INTEGRAL
  6. GRB (?) 050504: IR Observations, Intriguing Source
  7. GRB 050502b, Optical observations
  8. GRB050502a: P60 Observations (Correction)
  9. GRB050502a: P60 Observations
  10. Renewal of SGR 1806-20 activity
  11. GRB 050502a: RBO Observations
  12. GRB 050502A: WSRT Radio Observations
  13. GRB050502A: Optical Observations
  14. GRB050502B Swift-BAT refined analysis
  15. GRB050502B: I band source in XRT error circle
  16. Swift UVOT refined analysis
  17. Retraction of Swift-BAT trigger 116145
  18. GRB 050502a : R band observation at Lulin observatory
  19. GRB 050502b : optical observation at Lulin observatory
  20. GRB 050502b: Swift XRT Position
  21. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  22. GRB050502B: Optical Limits from ANU 1m
  23. Swift Detection of the Bright Burst GRB050502b
  24. GRB 050502: INTEGRAL results
  25. GRB050502: ANU 1m optical Observations
  26. GRB 050502: Confirmed variability of the afterglow candidate +
  27. GRB 050502: PAIRITEL IR Observations
  28. GRB050502 - Correction on the Optical Candidate from the Liverpool
  29. GRB 050502 - A long GRB detected with INTEGRAL
  30. GRB 050502: ROTSE-III Detection of Possible Counterpart
  31. Swift-BAT Trigger 115881 is not a real GRB
  32. Swift/BAT possible detection of a weak burst GRB050430
  33. GRB 050401: Rc observation
  34. GRB050416a: Radio Detection
  35. GRB 050422: Swift-UVOT observation
  36. GRB 050422: Swift-BAT refined analysis
  37. GRB 050422: Swift XRT Position
  38. Swift Detection of GRB 050422
  39. GRB 050421: NIR observations
  40. GRB 050416: Optical/NIR observations
  41. GRB 050421: SLOTIS observations
  42. GRB 050421: Further Analysis of IR imaging
  43. GRB050421: Radio Observations
  44. GRB050421: Radio Observations
  45. GRB 050421: Swift-UVOT observation
  46. GRB 050421: IR Observations
  47. GRB 050421: Swift-BAT refined analysis
  48. GRB 050421: ROTSE-III Optical Limits
  49. GRB 050421: NIR observations re-examination
  50. GRB 050421: early Swift XRT analysis results
  51. GRB 050421: NIR observations
  52. GRB050421: P60 Observations
  53. GRB 050421: BOOTES-2 simultaneous optical observations
  54. GRB 050421: Optical observations at the INT
  55. Swift Detection of GRB050421
  56. GRB 050416b: Tentative Swift XRT Position
  57. GRB 050315: potential host galaxy
  58. GRB050326: analysis of the XMM-Newton observation
  59. GRB 050412: Chandra observations
  60. GRB050416A, optical observations
  61. GRB 050418: Swift-BAT refined analysis
  62. Swift-BAT detection of the bright and long GRB 050418
  63. GRB 050416: Mitsume optical observation
  64. GRB 050416 : optical observation at Xinglong observatory
  65. GRB 050416B: optical observations
  66. GRB 050416b: Swift-BAT refined analysis
  67. GRB 050416b: LCO observations
  68. GRB 050416b: LCO observations
  69. GRB050416B: IR observations
  70. GRB 050416: Swift/UVOT refined analysis
  71. Swift-BAT detection of GRB 050416b
  72. IBAS GRB Alert # 2463: not a GRB
  73. GRB050412: Radio Observations
  74. GRB 050416: Swift/UVOT detection of afterglow emission
  75. GRB050416: Refined Swift-XRT analysis
  76. GRB050416: Maidanak optical observations
  77. GRB 050416: Swift-BAT refined analysis
  78. GRB 050416: ART observations
  79. GRB 050416,optical observation
  80. GRB 050416: KAIT observations
  81. GRB050416: P200 NIR Observations
  82. GRB 050416: Swift XRT Position
  83. GRB 050416: Radio observations
  84. Confirmation of OT for GRB050416
  85. GRB050416: P60 Afterglow Candidate
  86. Swift BAT/XRT Detection of GRB 050416
  87. GRB 050412: Subaru observations
  88. GRB 050408: RTT150 optical observations
  89. GRB 050412: PROMPT VRcIc Observations
  90. GRB 050408: Kuiper 1.5m observations
  91. GRB 050412: optical limit
  92. GRB 050412: optical observations
  93. GRB 050408: refined XRT analysis, no jet break seen yet
  94. GRB 050412: early Swift XRT analysis results
  95. GRB 050412 : XingLong optical observation
  96. GRB 050412: Swift-BAT refined analysis
  97. GRB 050412: ANU 2.3m observations
  98. GRB 050412: Early Optical/Ultraviolet Observations with
  99. GRB 050412: retraction of UVOT transient report
  100. GRB 050412: UVOT transient not in XRT error circle

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