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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"

28255 results found.

  1. GRB 050502A: Redshift measurement based on Keck HIRES Observations
  2. Swift Detection of the Bright Burst GRB050502b
  3. GRB 050502: INTEGRAL results
  4. GRB 050502: ROTSE-III Detection of Possible Counterpart
  5. Swift/BAT possible detection of a weak burst GRB050430
  6. GRB050416a: Radio Detection
  7. GRB 050422: Swift-UVOT observation
  8. GRB 050422: Swift-BAT refined analysis
  9. Swift Detection of GRB 050422
  10. GRB 050421: SLOTIS observations
  11. GRB 050421: Further Analysis of IR imaging
  12. GRB050421: Radio Observations
  13. GRB050421: Radio Observations
  14. GRB 050421: IR Observations
  15. GRB 050421: Swift-BAT refined analysis
  16. GRB050421
  17. GRB 050421: early Swift XRT analysis results
  18. GRB 050421: NIR observations
  19. GRB050421: P60 Observations
  20. GRB 050421: BOOTES-2 simultaneous optical observations
  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. GRB050416A, optical observations
  26. GRB 050418: Swift-BAT refined analysis
  27. GRB 050416: Mitsume optical observation
  28. GRB050416B: IR observations
  29. GRB050412: Radio Observations
  30. GRB 050416: Swift/UVOT detection of afterglow emission
  31. GRB050416: Refined Swift-XRT analysis
  32. GRB 050416,optical observation
  33. GRB050416: P200 NIR Observations
  34. GRB 050416: Radio observations
  35. Swift BAT/XRT Detection of GRB 050416
  36. GRB 050412: PROMPT VRcIc Observations
  37. GRB 050408: Kuiper 1.5m observations
  38. GRB 050412: early Swift XRT analysis results
  39. GRB 050412: Early Optical/Ultraviolet Observations with
  40. GRB 050408: SDSS Field Calibration
  41. GRB050412: P60 Observations
  42. GRB 050412: Swift XRT Position
  43. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  44. GRB 050412: IR and Optical observations
  45. GRB 050412: IR Observations
  46. GRB050408: Radio Observations
  47. GRB 050401: Optical limit
  48. GRB050410: P60 Observations
  49. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  50. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  51. GRB050410: Radio Observations
  52. GRB050410: MASTER optical observations
  53. GRB 050410: Early observations with Swift-UVOT
  54. Swift-BAT detection of GRB 050410
  55. GRB 050408: Inconsistency of host galaxy identification
  56. GRB 050408: Subaru Observations
  57. GRB 050408: WIDGET simultaneous optical observations
  58. GRB 050408: Properties of the Host Galaxy
  59. GRB050408: Radio Observations
  60. GRB 050408: Swift XRT analysis
  61. GRB 050408: Optical limit at 20 min after the burst
  62. GRB050408: REM NIR and Optical observation
  63. GRB 050408,optical observation
  64. GRB 050408: Mercator Optical Observations
  65. GRB 050408: Optical afterglow confirmed
  66. GRB 050408: opitcal observation
  67. GRB 050408, optical observations
  68. GRB 050408 optical candidate
  69. GRB 050408: Swift XRT Position
  70. GRB050408: MASTER optical observations
  71. GRB050401: Radio Detection
  72. GRB 050406: early Swift XRT analysis results
  73. GRB 050406 BAT refined analysis
  74. GRB 050406: Early observations with Swift-UVOT
  75. Swift-BAT detection of GRB 050406
  76. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  77. GRB 050401: VLT spectroscopic redshift
  78. GRB 050401 BAT refined analysis
  79. GRB050401: TNG R-band observation
  80. GRB 050402: Early observations with Swift-UVOT
  81. Swift Trigger 113225: P60 Observations
  82. GRB 050401: Optical afterglow confirmed
  83. GRB 050401: Prompt XRT position
  84. Retraction of three Swift GRB triggers
  85. GRB050331: No Afterglow Detected
  86. Swift-BAT detection of GRB 050331b
  87. GRB 050331: Swift UVOT Source
  88. Swift-BAT detection of GRB 050331
  89. GRB 050326: Early observations with Swift-UVOT
  90. GRB 050326 XMM-Newton observation
  91. GRB 050326: Swift XRT Position
  92. GRB 050326 BAT refined analysis
  93. GRB050326: delayed XRT observation
  94. GRB050319, color indices
  95. GRB050319: optical observation, March 20-22
  96. GRB050319: RTT150 Optical Observations
  97. Swift-BAT trigger 112060 is not a real GRB
  98. GRB 050318: Swift-BAT refined analysis
  99. GRB050319: VLA Observations
  100. GRB050319: radio observation

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