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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"

41733 results found.

  1. GRB 050416b:Swift XRT afterglow upper limits
  2. GRB 050416b:Swift XRT afterglow upper limits
  3. Swift-BAT detection of GRB050505
  4. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  5. GRB050502b: Afterglow Confirmation
  6. GRB050502: P200 Observations (Correction)
  7. GRB050502: P200 Observations
  8. GRB 050504 : R band observation at Lulin observatory
  9. Swift UVOT observation of GRB 050504
  10. GRB 050504, R band Observations
  11. GRB050504: Faulkes North optical robotic limit
  12. GRB 050502b, V band Observations
  13. GRB050504: P60 Observations
  14. GRB 050504: A long GRB detected with INTEGRAL
  15. GRB (?) 050504: IR Observations, Intriguing Source
  16. GRB 050502b, Optical observations
  17. GRB050502a: P60 Observations (Correction)
  18. GRB050502a: P60 Observations
  19. Renewal of SGR 1806-20 activity
  20. GRB 050502a: RBO Observations
  21. GRB 050502A: WSRT Radio Observations
  22. GRB050502A: Optical Observations
  23. GRB050502B Swift-BAT refined analysis
  24. GRB050502B: I band source in XRT error circle
  25. Swift UVOT refined analysis
  26. GRB 050502a : R band observation at Lulin observatory
  27. GRB 050502b : optical observation at Lulin observatory
  28. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  29. GRB050502B: Optical Limits from ANU 1m
  30. Swift Detection of the Bright Burst GRB050502b
  31. GRB050502: ANU 1m optical Observations
  32. GRB 050502: PAIRITEL IR Observations
  33. GRB 050502 - A long GRB detected with INTEGRAL
  34. GRB 050502: ROTSE-III Detection of Possible Counterpart
  35. Swift/BAT possible detection of a weak burst GRB050430
  36. GRB 050401: Rc observation
  37. GRB050416a: Radio Detection
  38. GRB 050422: Swift-UVOT observation
  39. GRB 050422: Swift-BAT refined analysis
  40. Swift Detection of GRB 050422
  41. GRB 050421: NIR observations
  42. GRB 050416: Optical/NIR observations
  43. GRB 050421: SLOTIS observations
  44. GRB 050421: Further Analysis of IR imaging
  45. GRB050421: Radio Observations
  46. GRB050421: Radio Observations
  47. GRB 050421: Swift-UVOT observation
  48. GRB 050421: IR Observations
  49. GRB 050421: Swift-BAT refined analysis
  50. GRB 050421: ROTSE-III Optical Limits
  51. GRB 050421: NIR observations re-examination
  52. GRB050421
  53. GRB 050421: early Swift XRT analysis results
  54. GRB 050421: NIR observations
  55. GRB050421: P60 Observations
  56. GRB 050421: BOOTES-2 simultaneous optical observations
  57. GRB 050421: Optical observations at the INT
  58. Swift Detection of GRB050421
  59. GRB 050416b: Tentative Swift XRT Position
  60. GRB 050315: potential host galaxy
  61. GRB050326: analysis of the XMM-Newton observation
  62. GRB050418: Null Optical Observations
  63. GRB 050412: Chandra observations
  64. GRB050416A, optical observations
  65. GRB 050418: Swift-BAT refined analysis
  66. GRB 050416: Mitsume optical observation
  67. GRB 050416 : optical observation at Xinglong observatory
  68. GRB 050416B: optical observations
  69. GRB 050416b: LCO observations
  70. GRB 050416b: LCO observations
  71. GRB050416B: IR observations
  72. GRB 050416: Swift/UVOT refined analysis
  73. Swift-BAT detection of GRB 050416b
  74. GRB050412: Radio Observations
  75. GRB 050416: Swift/UVOT detection of afterglow emission
  76. GRB050416: Refined Swift-XRT analysis
  77. GRB050416: Maidanak optical observations
  78. GRB 050416: ART observations
  79. GRB 050416,optical observation
  80. GRB 050416: KAIT observations
  81. GRB050416: P200 NIR Observations
  82. GRB 050416: Radio observations
  83. Confirmation of OT for GRB050416
  84. GRB050416: P60 Afterglow Candidate
  85. Swift BAT/XRT Detection of GRB 050416
  86. GRB 050412: Subaru observations
  87. GRB 050408: RTT150 optical observations
  88. GRB050408: optical observation
  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 : XingLong optical observation
  95. GRB 050412: Swift-BAT refined analysis
  96. GRB 050412: ANU 2.3m observations
  97. GRB 050412: Early Optical/Ultraviolet Observations with
  98. GRB 050412: UVOT transient not in XRT error circle
  99. GRB 050412: Optical limit
  100. GRB 050412: LCO Optical Observations

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