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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"

28253 results found.

  1. GRB 050502: INTEGRAL results
  2. GRB 050502: ROTSE-III Detection of Possible Counterpart
  3. Swift/BAT possible detection of a weak burst GRB050430
  4. GRB050416a: Radio Detection
  5. GRB 050422: Swift-UVOT observation
  6. GRB 050422: Swift-BAT refined analysis
  7. Swift Detection of GRB 050422
  8. GRB 050421: SLOTIS observations
  9. GRB 050421: Further Analysis of IR imaging
  10. GRB050421: Radio Observations
  11. GRB050421: Radio Observations
  12. GRB 050421: IR Observations
  13. GRB 050421: Swift-BAT refined analysis
  14. GRB050421
  15. GRB 050421: early Swift XRT analysis results
  16. GRB 050421: NIR observations
  17. GRB050421: P60 Observations
  18. GRB 050421: BOOTES-2 simultaneous optical observations
  19. GRB 050416b: Tentative Swift XRT Position
  20. GRB 050315: potential host galaxy
  21. GRB050326: analysis of the XMM-Newton observation
  22. GRB050418: Null Optical Observations
  23. GRB050416A, optical observations
  24. GRB 050418: Swift-BAT refined analysis
  25. GRB 050416: Mitsume optical observation
  26. GRB050416B: IR observations
  27. GRB050412: Radio Observations
  28. GRB 050416: Swift/UVOT detection of afterglow emission
  29. GRB050416: Refined Swift-XRT analysis
  30. GRB 050416,optical observation
  31. GRB050416: P200 NIR Observations
  32. GRB 050416: Radio observations
  33. Swift BAT/XRT Detection of GRB 050416
  34. GRB 050412: PROMPT VRcIc Observations
  35. GRB 050408: Kuiper 1.5m observations
  36. GRB 050412: early Swift XRT analysis results
  37. GRB 050412: Early Optical/Ultraviolet Observations with
  38. GRB 050408: SDSS Field Calibration
  39. GRB050412: P60 Observations
  40. GRB 050412: Swift XRT Position
  41. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  42. GRB 050412: IR and Optical observations
  43. GRB 050412: IR Observations
  44. GRB050408: Radio Observations
  45. GRB 050401: Optical limit
  46. GRB050410: P60 Observations
  47. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  48. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  49. GRB050410: Radio Observations
  50. GRB050410: MASTER optical observations
  51. GRB 050410: Early observations with Swift-UVOT
  52. Swift-BAT detection of GRB 050410
  53. GRB 050408: Inconsistency of host galaxy identification
  54. GRB 050408: Subaru Observations
  55. GRB 050408: WIDGET simultaneous optical observations
  56. GRB 050408: Properties of the Host Galaxy
  57. GRB050408: Radio Observations
  58. GRB 050408: Swift XRT analysis
  59. GRB 050408: Optical limit at 20 min after the burst
  60. GRB050408: REM NIR and Optical observation
  61. GRB 050408,optical observation
  62. GRB 050408: Mercator Optical Observations
  63. GRB 050408: Optical afterglow confirmed
  64. GRB 050408: opitcal observation
  65. GRB 050408, optical observations
  66. GRB 050408 optical candidate
  67. GRB 050408: Swift XRT Position
  68. GRB050408: MASTER optical observations
  69. GRB050401: Radio Detection
  70. GRB 050406: early Swift XRT analysis results
  71. GRB 050406 BAT refined analysis
  72. GRB 050406: Early observations with Swift-UVOT
  73. Swift-BAT detection of GRB 050406
  74. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  75. GRB 050401: VLT spectroscopic redshift
  76. GRB 050401 BAT refined analysis
  77. GRB050401: TNG R-band observation
  78. GRB 050402: Early observations with Swift-UVOT
  79. Swift Trigger 113225: P60 Observations
  80. GRB 050401: Optical afterglow confirmed
  81. GRB 050401: Prompt XRT position
  82. Retraction of three Swift GRB triggers
  83. GRB050331: No Afterglow Detected
  84. Swift-BAT detection of GRB 050331b
  85. GRB 050331: Swift UVOT Source
  86. Swift-BAT detection of GRB 050331
  87. GRB 050326: Early observations with Swift-UVOT
  88. GRB 050326 XMM-Newton observation
  89. GRB 050326: Swift XRT Position
  90. GRB 050326 BAT refined analysis
  91. GRB050326: delayed XRT observation
  92. GRB050319, color indices
  93. GRB050319: optical observation, March 20-22
  94. GRB050319: RTT150 Optical Observations
  95. Swift-BAT trigger 112060 is not a real GRB
  96. GRB 050318: Swift-BAT refined analysis
  97. GRB050319: VLA Observations
  98. GRB050319: radio observation
  99. GRB 050319: Swift-UVOT detection of the afterglow
  100. GRB 050315: Variability Analysis of Swift BAT Time History

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