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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"

28232 results found.

  1. GRB050418: Null Optical Observations
  2. GRB050416A, optical observations
  3. GRB 050418: Swift-BAT refined analysis
  4. GRB 050416: Mitsume optical observation
  5. GRB050416B: IR observations
  6. GRB050412: Radio Observations
  7. GRB 050416: Swift/UVOT detection of afterglow emission
  8. GRB050416: Refined Swift-XRT analysis
  9. GRB 050416,optical observation
  10. GRB050416: P200 NIR Observations
  11. GRB 050416: Radio observations
  12. Swift BAT/XRT Detection of GRB 050416
  13. GRB 050412: PROMPT VRcIc Observations
  14. GRB 050408: Kuiper 1.5m observations
  15. GRB 050412: early Swift XRT analysis results
  16. GRB 050412: Early Optical/Ultraviolet Observations with
  17. GRB 050408: SDSS Field Calibration
  18. GRB050412: P60 Observations
  19. GRB 050412: Swift XRT Position
  20. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  21. GRB 050412: IR and Optical observations
  22. GRB 050412: IR Observations
  23. GRB050408: Radio Observations
  24. GRB 050401: Optical limit
  25. GRB050410: P60 Observations
  26. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  27. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  28. GRB050410: Radio Observations
  29. GRB050410: MASTER optical observations
  30. GRB 050410: Early observations with Swift-UVOT
  31. Swift-BAT detection of GRB 050410
  32. GRB 050408: Inconsistency of host galaxy identification
  33. GRB 050408: Subaru Observations
  34. GRB 050408: WIDGET simultaneous optical observations
  35. GRB 050408: Properties of the Host Galaxy
  36. GRB050408: Radio Observations
  37. GRB 050408: Swift XRT analysis
  38. GRB 050408: Optical limit at 20 min after the burst
  39. GRB050408: REM NIR and Optical observation
  40. GRB 050408,optical observation
  41. GRB 050408: Mercator Optical Observations
  42. GRB 050408: Optical afterglow confirmed
  43. GRB 050408: opitcal observation
  44. GRB 050408, optical observations
  45. GRB 050408 optical candidate
  46. GRB 050408: Swift XRT Position
  47. GRB050408: MASTER optical observations
  48. GRB050401: Radio Detection
  49. GRB 050406: early Swift XRT analysis results
  50. GRB 050406 BAT refined analysis
  51. GRB 050406: Early observations with Swift-UVOT
  52. Swift-BAT detection of GRB 050406
  53. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  54. GRB 050401: VLT spectroscopic redshift
  55. GRB 050401 BAT refined analysis
  56. GRB050401: TNG R-band observation
  57. GRB 050402: Early observations with Swift-UVOT
  58. Swift Trigger 113225: P60 Observations
  59. GRB 050401: Optical afterglow confirmed
  60. GRB 050401: Prompt XRT position
  61. Retraction of three Swift GRB triggers
  62. GRB050331: No Afterglow Detected
  63. Swift-BAT detection of GRB 050331b
  64. GRB 050331: Swift UVOT Source
  65. Swift-BAT detection of GRB 050331
  66. GRB 050326: Early observations with Swift-UVOT
  67. GRB 050326 XMM-Newton observation
  68. GRB 050326: Swift XRT Position
  69. GRB 050326 BAT refined analysis
  70. GRB050326: delayed XRT observation
  71. GRB050319, color indices
  72. GRB050319: optical observation, March 20-22
  73. GRB050319: RTT150 Optical Observations
  74. Swift-BAT trigger 112060 is not a real GRB
  75. GRB 050318: Swift-BAT refined analysis
  76. GRB050319: VLA Observations
  77. GRB050319: radio observation
  78. GRB 050319: Swift-UVOT detection of the afterglow
  79. GRB 050315: Variability Analysis of Swift BAT Time History
  80. GRB050319: Radio Observations
  81. GRB 050319: NIR afterglow candidate
  82. GRB 050319:Near IR afterglow
  83. GRB 050318: SWIFT-UVOT refined analysis
  84. GRB 050319 : Confirmation of optical afterglow decay
  85. GRB 050319: Swift-BAT refined analysis
  86. GRB050319,optical observation
  87. GRB 050318: Swift/UVOT detection of afterglow emission
  88. RXTE Observations of GRB050318
  89. GRB050223: analysis of the XMM-Newton observation
  90. GRB050316: MASTER before, simultanious and follow up optical
  91. GRB 050306: ROTSE-III early limits
  92. GRB050316: MASTER optical observations
  93. GRB 050315: Swift-BAT further refined analysis
  94. GRB 050315 I-band observations
  95. GRB050315: Radio afterglow
  96. GRB050315: Swift-BAT Refined analysis
  97. Non-detection of GRB050315 in ATCA Radio Observations
  98. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  99. GRB 050315: Early Observations with Swift/UVOT
  100. GRB 050306: Radio Observations

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