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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"

27462 results found.

  1. GRB050505: Infrared observations
  2. GRB 050505: Further Swift UVOT observations.
  3. GRB 050505 UVOT
  4. GRB 050505: Swift XRT Position
  5. GRB050505 Swift-BAT refined analysis
  6. GRB 050416b:Swift XRT afterglow upper limits
  7. GRB 050416b:Swift XRT afterglow upper limits
  8. Swift-BAT detection of GRB050505
  9. Swift UVOT observation of GRB 050504
  10. GRB050504: Faulkes North optical robotic limit
  11. GRB 050502b, V band Observations
  12. GRB (?) 050504: IR Observations, Intriguing Source
  13. Renewal of SGR 1806-20 activity
  14. GRB050502B Swift-BAT refined analysis
  15. Swift UVOT refined analysis
  16. Retraction of Swift-BAT trigger 116145
  17. GRB 050502b: Swift XRT Position
  18. Swift Detection of the Bright Burst GRB050502b
  19. GRB050502: ANU 1m optical Observations
  20. GRB 050502: ROTSE-III Detection of Possible Counterpart
  21. Swift-BAT Trigger 115881 is not a real GRB
  22. Swift/BAT possible detection of a weak burst GRB050430
  23. GRB 050422: Swift-UVOT observation
  24. GRB 050422: Swift-BAT refined analysis
  25. GRB 050422: Swift XRT Position
  26. Swift Detection of GRB 050422
  27. GRB 050421: SLOTIS observations
  28. GRB050421: Radio Observations
  29. GRB050421: Radio Observations
  30. GRB 050421: Swift-UVOT observation
  31. GRB 050421: Swift-BAT refined analysis
  32. GRB 050421: ROTSE-III Optical Limits
  33. GRB050421
  34. GRB 050421: early Swift XRT analysis results
  35. GRB 050421: BOOTES-2 simultaneous optical observations
  36. GRB 050421: Optical observations at the INT
  37. Swift Detection of GRB050421
  38. GRB 050416b: Tentative Swift XRT Position
  39. GRB 050418: Swift-BAT refined analysis
  40. Swift-BAT detection of the bright and long GRB 050418
  41. GRB 050416B: optical observations
  42. GRB 050416b: Swift-BAT refined analysis
  43. GRB 050416b: LCO observations
  44. GRB 050416b: LCO observations
  45. GRB050416B: IR observations
  46. GRB 050416: Swift/UVOT refined analysis
  47. Swift-BAT detection of GRB 050416b
  48. GRB 050416: Swift/UVOT detection of afterglow emission
  49. GRB050416: Refined Swift-XRT analysis
  50. GRB 050416: Swift-BAT refined analysis
  51. GRB 050416: ART observations
  52. GRB 050416,optical observation
  53. GRB 050416: KAIT observations
  54. GRB 050416: Swift XRT Position
  55. GRB 050416: Radio observations
  56. Confirmation of OT for GRB050416
  57. Swift BAT/XRT Detection of GRB 050416
  58. GRB 050412: PROMPT VRcIc Observations
  59. GRB 050412: optical limit
  60. GRB 050412: early Swift XRT analysis results
  61. GRB 050412: Swift-BAT refined analysis
  62. GRB 050412: Optical limit
  63. GRB 050412: Optical observations
  64. GRB 050412: Swift XRT Position
  65. GRB050412: optical limit before and during GRB
  66. GRB 050412: LCO optical observations
  67. GRB050412: ROTSE-III Optical Limits
  68. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  69. GRB 050412: IR Observations
  70. GRB 050401: Optical limit
  71. GRB 050408: Optical limit
  72. GRB 050410, optical observations
  73. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  74. GRB 050410 R band Optical Observations
  75. GRB 050408: Swift XRT measurement of possible jet break
  76. GRB 050410: Early observations with Swift-UVOT
  77. Swift-BAT detection of GRB 050410
  78. GRB 050410: Swift XRT Position
  79. GRB 050408: Swift XRT analysis
  80. GRB 050408,optical observation
  81. GRB 050408: Magellan astrometry and photometry
  82. GRB 050408: ROTSE-III Optical Limits
  83. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  84. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  85. GRB 050406: early Swift XRT analysis results
  86. GRB 050406 BAT refined analysis
  87. GRB 050406: Early observations with Swift-UVOT
  88. GRB 050406: Swift XRT Position
  89. Swift-BAT detection of GRB 050406
  90. Konus-Wind observation of GRB 050401
  91. GRB050401: Radio observation at 610 MHz with GMRT
  92. GRB 050401 Optical Observations
  93. GRB 050401 BAT refined analysis
  94. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  95. GRB 050402: Early observations with Swift-UVOT
  96. Swift Trigger 113225: P60 Observations
  97. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  98. GRB 050401: Optical afterglow candidate
  99. Swift-BAT detection of GRB 050401
  100. GRB 050401: Prompt XRT position

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