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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"

23690 results found.

  1. GRB050505 Swift-BAT refined analysis
  2. GRB 050502a: Optical Observations
  3. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  4. GRB050502b: Afterglow Confirmation
  5. GRB050502: P200 Observations (Correction)
  6. GRB050502: P200 Observations
  7. GRB 050504 : R band observation at Lulin observatory
  8. Swift UVOT observation of GRB 050504
  9. GRB 050504, R band Observations
  10. GRB050504: Faulkes North optical robotic limit
  11. GRB 050502b, V band Observations
  12. GRB 050504: A long GRB detected with INTEGRAL
  13. GRB 050502b, Optical observations
  14. Renewal of SGR 1806-20 activity
  15. GRB050502A: Optical Observations
  16. GRB050502B Swift-BAT refined analysis
  17. GRB 050502a : R band observation at Lulin observatory
  18. GRB 050502b : optical observation at Lulin observatory
  19. Swift Detection of the Bright Burst GRB050502b
  20. GRB 050502: INTEGRAL results
  21. GRB 050502 - A long GRB detected with INTEGRAL
  22. Swift/BAT possible detection of a weak burst GRB050430
  23. GRB 050401: Rc observation
  24. GRB050416a: Radio Detection
  25. GRB 050422: Swift-UVOT observation
  26. GRB 050422: Swift-BAT refined analysis
  27. Swift Detection of GRB 050422
  28. GRB050421: Radio Observations
  29. GRB050421: Radio Observations
  30. GRB 050421: Swift-UVOT observation
  31. GRB 050421: Swift-BAT refined analysis
  32. GRB 050421: NIR observations re-examination
  33. GRB 050421: early Swift XRT analysis results
  34. GRB 050421: NIR observations
  35. GRB 050421: BOOTES-2 simultaneous optical observations
  36. GRB 050421: Optical observations at the INT
  37. Swift Detection of GRB050421
  38. GRB 050418: Swift-BAT refined analysis
  39. Swift-BAT detection of the bright and long GRB 050418
  40. GRB 050416 : optical observation at Xinglong observatory
  41. GRB 050416B: optical observations
  42. GRB 050416b: Swift-BAT refined analysis
  43. GRB050416B: IR observations
  44. Swift-BAT detection of GRB 050416b
  45. GRB050412: Radio Observations
  46. GRB050416: Refined Swift-XRT analysis
  47. GRB050416: Maidanak optical observations
  48. GRB 050416: Swift-BAT refined analysis
  49. GRB050416: P200 NIR Observations
  50. GRB 050416: Radio observations
  51. Confirmation of OT for GRB050416
  52. Swift BAT/XRT Detection of GRB 050416
  53. GRB 050408: RTT150 optical observations
  54. GRB050408: optical observation
  55. GRB 050412: PROMPT VRcIc Observations
  56. GRB 050412: optical limit
  57. GRB 050412: optical observations
  58. GRB 050408: refined XRT analysis, no jet break seen yet
  59. GRB 050412: early Swift XRT analysis results
  60. GRB 050412 : XingLong optical observation
  61. GRB 050412: Swift-BAT refined analysis
  62. GRB 050412: ANU 2.3m observations
  63. GRB 050408: SDSS Field Calibration
  64. GRB 050412: Optical limit
  65. GRB050412: P60 Observations
  66. GRB 050412: Swift XRT Position
  67. GRB050412: ROTSE-III Optical Limits
  68. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  69. GRB 050412: IR and Optical observations
  70. GRB050408: Radio Observations
  71. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  72. GRB 050408: PROMPT VRcIc Observations
  73. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  74. GRB 050410 R band Optical Observations
  75. GRB050410: Radio Observations
  76. GRB 050408: Swift XRT measurement of possible jet break
  77. GRB050410: MASTER optical observations
  78. GRB 050410: Early observations with Swift-UVOT
  79. Swift-BAT detection of GRB 050410
  80. GRB 050410: Swift XRT Position
  81. GRB 050408: Inconsistency of host galaxy identification
  82. GRB 050408: WIDGET simultaneous optical observations
  83. GRB 050408: SOAR UBVRc Observations
  84. GRB050408: Radio Observations
  85. GRB 050408: Swift XRT analysis
  86. GRB050408: REM NIR and Optical observation
  87. GRB 050408: Emission and absorption redshift
  88. GRB 050408: First Optical observations with TFOSC at the RTT150
  89. GRB 050408: steepening of the optical decay
  90. GRB 050408 optical candidate
  91. GRB 050408: Swift XRT Position
  92. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  93. GRB050408: MASTER optical observations
  94. GRB050401: Radio Detection
  95. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  96. GRB 050406: early Swift XRT analysis results
  97. GRB 050406 BAT refined analysis
  98. GRB 050406: Early observations with Swift-UVOT
  99. GRB 050406: Swift XRT Position
  100. Swift-BAT detection of GRB 050406

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