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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"

18481 results found.

  1. GRB (?) 050504: IR Observations, Intriguing Source
  2. GRB 050502b, Optical observations
  3. GRB050502a: P60 Observations (Correction)
  4. GRB050502a: P60 Observations
  5. GRB050502B Swift-BAT refined analysis
  6. GRB050502B: I band source in XRT error circle
  7. Swift UVOT refined analysis
  8. GRB050502B: Optical Limits from ANU 1m
  9. GRB 050502: ROTSE-III Detection of Possible Counterpart
  10. Swift/BAT possible detection of a weak burst GRB050430
  11. GRB050416a: Radio Detection
  12. Swift Detection of GRB 050422
  13. GRB 050421: SLOTIS observations
  14. GRB 050421: Further Analysis of IR imaging
  15. GRB050421: Radio Observations
  16. GRB050421: Radio Observations
  17. GRB 050421: Swift-UVOT observation
  18. GRB 050421: IR Observations
  19. GRB050421
  20. GRB 050421: NIR observations
  21. GRB050421: P60 Observations
  22. GRB 050421: BOOTES-2 simultaneous optical observations
  23. GRB 050416b: Tentative Swift XRT Position
  24. GRB 050315: potential host galaxy
  25. GRB050326: analysis of the XMM-Newton observation
  26. GRB050418: Null Optical Observations
  27. GRB050416A, optical observations
  28. GRB 050416: Mitsume optical observation
  29. GRB050416B: IR observations
  30. GRB 050416: Swift/UVOT refined analysis
  31. GRB050412: Radio Observations
  32. GRB 050416: Swift/UVOT detection of afterglow emission
  33. GRB 050416,optical observation
  34. GRB050416: P200 NIR Observations
  35. GRB 050416: Radio observations
  36. Swift BAT/XRT Detection of GRB 050416
  37. GRB 050412: Subaru observations
  38. GRB050408: optical observation
  39. GRB 050408: Kuiper 1.5m observations
  40. GRB 050412: optical observations
  41. GRB 050412: Early Optical/Ultraviolet Observations with
  42. GRB 050408: SDSS Field Calibration
  43. GRB050412: P60 Observations
  44. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  45. GRB 050412: IR and Optical observations
  46. GRB 050412: IR Observations
  47. GRB050408: Radio Observations
  48. GRB050410: P60 Observations
  49. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  50. GRB 050408: PROMPT VRcIc Observations
  51. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  52. GRB050410: Radio Observations
  53. GRB 050408: Swift XRT measurement of possible jet break
  54. GRB050410: MASTER optical observations
  55. GRB 050410: Early observations with Swift-UVOT
  56. Swift-BAT detection of GRB 050410
  57. GRB 050408: Inconsistency of host galaxy identification
  58. GRB 050408: Subaru Observations
  59. GRB 050408: WIDGET simultaneous optical observations
  60. GRB 050408: SOAR UBVRc Observations
  61. GRB 050408: Properties of the Host Galaxy
  62. GRB050408: Radio Observations
  63. GRB050408: REM NIR and Optical observation
  64. GRB 050408,optical observation
  65. GRB 050408: Magellan astrometry and photometry
  66. GRB 050408: Optical afterglow confirmed
  67. GRB 050408: opitcal observation
  68. GRB 050408, optical observations
  69. GRB 050408: Swift XRT Position
  70. GRB050408: MASTER optical observations
  71. GRB050401: Radio Detection
  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. GRB050401: TNG R-band observation
  76. GRB 050402: Early observations with Swift-UVOT
  77. Swift Trigger 113225: P60 Observations
  78. GRB 050401: Optical afterglow confirmed
  79. Swift-BAT detection of GRB 050401
  80. GRB 050401: Prompt XRT position
  81. GRB050331: No Afterglow Detected
  82. GRB 050331: Swift UVOT Source
  83. GRB 050326: Early observations with Swift-UVOT
  84. GRB 050326 XMM-Newton observation
  85. GRB 050326: Swift XRT Position
  86. GRB050326: optical limit 33min before GRB
  87. GRB 050326 BAT refined analysis
  88. GRB050326: delayed XRT observation
  89. GRB050319: optical observation, March 20-22
  90. GRB050319: RTT150 Optical Observations
  91. GRB050319: VLA Observations
  92. GRB050319: radio observation
  93. GRB 050319: Swift-UVOT detection of the afterglow
  94. GRB050319: Radio Observations
  95. GRB 050319: NIR afterglow candidate
  96. GRB 050319:Near IR afterglow
  97. GRB050319,optical observation
  98. GRB 050318: Swift/UVOT detection of afterglow emission
  99. RXTE Observations of GRB050318
  100. GRB050223: analysis of the XMM-Newton observation

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