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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"

19665 results found.

  1. GRB 090423: Swift detection of a burst
  2. GRB 090422: Liverpool Telescope possible candidate
  3. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  4. GRB 090422: Swift-BAT refined analysis
  5. GRB 090422: Enhanced Swift-XRT position
  6. GRB 090422: Liverpool Telescope observations
  7. GRB 090422: Swift detection of a burst
  8. GRB 090418A: Swift/UVOT Detection of the Neighbouring Galaxy
  9. Swift-BAT trigger 349718 is not a burst
  10. GRB 090417B: Optical observation
  11. GRB 090418A: optical observations
  12. GRB 090419: Swift/UVOT Observations
  13. GRB 090418B: Faulkes Telescope North observations
  14. GRB 090418A: Swift/UVOT Observations
  15. GRB 090417B: Swift/UVOT Upper Limits
  16. GRB 090417B Correction to the BAT refined analysis position
  17. GRB 090419: Swift-XRT refined analysis
  18. Konus-Wind observation of GRB 090418B
  19. GRB 090419: GROND detection of afterglow candidate
  20. GRB 090419: Swift-BAT refined analysis
  21. VLA radio upper limit on GRB 090417B
  22. GRB 090419: Enhanced Swift-XRT position
  23. GRB 090418: Swift XRT refined analysis
  24. GRB 090418A: ROTSE-III Refined Analysis
  25. GRB 090419: Swift detection of a burst
  26. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  27. GRB 090418: Swift-BAT refined analysis
  28. GRB 090417B: Swift-XRT refined analysis
  29. GRB 090418: Enhanced Swift-XRT position
  30. GRB 090417B: Swift-BAT further refined analysis
  31. GRB 090418: PAIRITEL NIR detection
  32. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  33. GRB 090418: Swift detection of a burst with optical afterglow
  34. GRB 090417B: Liverpool Telescope observations
  35. GRB 090417B: Swift-BAT refined analysis
  36. GRB 090417A: Swift-BAT refined analysis
  37. GRB 090417B: Swift detection of a burst
  38. GRB 090417: 2MASS galaxy within BAT Localization
  39. GRB 090417: Swift detection of a short burst
  40. GRB 090410: Suzaku WAM observation of the prompt emission
  41. GRB 090410: Swift-BAT refined analysis
  42. GRB 090410: Swift detection of a burst
  43. Swift-BAT Trigger 348781 is not a GRB
  44. Swift-BAT Trigger 348720 is not a GRB
  45. GRB090408, RIMOTS optical upper limits
  46. Swift-BAT trigger 348781: almost certainly not a burst
  47. GRB 090408B: MASTER II-Kourovka optical observations
  48. GRB 090408: Swift detection of a burst
  49. GRB 090407: Swift-XRT refined analysis
  50. GRB 090407: Swift UVOT Upper Limits
  51. GRB 090407: Enhanced Swift-XRT position
  52. GRB 090407: Swift-BAT refined analysis
  53. GRB 090407: ROTSE-III Optical Limits
  54. GRB 090407: Swift detection of a burst
  55. GRB 090404: millimeter detection
  56. GRB 090404: nIR observations at Calar Alto
  57. Swift/UVOT observations of GRB090404
  58. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  59. GRB 090404: Swift-XRT Team refined analysis
  60. GRB 090404: Swift-BAT refined analysis
  61. GRB 090404: Enhanced Swift-XRT position
  62. GRB 090404: Swift detection of a burst
  63. GRB 090401A: Suzaku WAM observation of the prompt emission
  64. GRB 090401B: Suzaku WAM observation of the prompt emission
  65. Konus-Wind observation of GRB 090401B
  66. GRB 090401B: VLA radio upper limit
  67. GRB090401B, RIMOTS optical upper limits
  68. Swift/UVOT observations of GRB090401B
  69. Swift/UVOT observations of GRB090401B
  70. GRB 090401B: Swift XRT Refined Analysis
  71. Konus-Wind observation of GRB 090401A
  72. GRB 090401B: Enhanced Swift-XRT position
  73. GRB 090401B: Swift-BAT refined analysis
  74. Swift/UVOT detection of GRB090401B
  75. GRB 090401B: Swift detection of a burst
  76. GRB 090401, Swift-BAT refined analysis
  77. GRB 090401: Swift detection of a burst
  78. GRB 090328: Swift XRT refined analysis
  79. GRB 090328: Swift UVOT observations
  80. GRB 090328: Updated position/optical afterglow candidate
  81. GRB 090328: Possible Swift/XRT detection
  82. Fermi LAT and GBM detections of GRB090328
  83. GRB 090323: UVOT Detection of Afterglow
  84. GRB 090323: Swift-XRT refined analysis
  85. GRB 090323: GROND Detection of the Afterglow and Photo-z
  86. GRB 090323: Possible XRT Counterpart
  87. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  88. Further Swift/UVOT observations of GRB 090313
  89. GRB 090313: detection with CARMA in 3mm band
  90. GRB 090313: TAROT La Silla observatory optical detection
  91. GRB 090313: Zadko Telescope observations
  92. GRB 090313 - PAIRITEL NIR detections
  93. GRB 090313: Swift-XRT refined analysis
  94. GRB 090313: Swift/UVOT upper limits
  95. GRB 090313: Faulkes Telescope North observations
  96. GRB 090306B: Confirmation of the X-ray afterglow
  97. GRB 090313: Swift-BAT refined analysis
  98. GRB 090313, GROND observations
  99. GRB 090309, Swift-BAT lag analysis
  100. GRB 090313: Swift detection of a burst

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