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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"

27927 results found.

  1. GRB 090419: Swift-BAT refined analysis
  2. VLA radio detection of GRB 090418
  3. VLA radio upper limit on GRB 090417B
  4. GRB 090419: Enhanced Swift-XRT position
  5. GRB 090418: Swift XRT refined analysis
  6. GRB 090418A: ROTSE-III Refined Analysis
  7. GRB 090419: Swift detection of a burst
  8. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  9. GRB 090418: Swift-BAT refined analysis
  10. GRB 090417B: Swift-XRT refined analysis
  11. GRB 090418: Enhanced Swift-XRT position
  12. GRB 090417B: Swift-BAT further refined analysis
  13. GRB 090418: PAIRITEL NIR detection
  14. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  15. GRB 090418: Swift detection of a burst with optical afterglow
  16. GRB 090417B: Liverpool Telescope observations
  17. GRB 090417B: Swift-BAT refined analysis
  18. GRB 090417A: Swift-BAT refined analysis
  19. GRB 090417B: Swift detection of a burst
  20. GRB 090417: 2MASS galaxy within BAT Localization
  21. GRB 090417: Swift detection of a short burst
  22. GRB 090412: Fermi GBM detection
  23. GRB 090411B: Fermi GBM detection
  24. GRB 090411A: Fermi GBM detection
  25. GRB 090410: Suzaku WAM observation of the prompt emission
  26. GRB 090410: Swift-BAT refined analysis
  27. GRB 090410: Swift detection of a burst
  28. GRB 090409: Fermi GBM detection
  29. Swift-BAT Trigger 348781 is not a GRB
  30. Swift-BAT Trigger 348720 is not a GRB
  31. GRB090408, RIMOTS optical upper limits
  32. Swift-BAT trigger 348781: almost certainly not a burst
  33. Fermi GBM Detection of a weak source
  34. GRB 090408B: MASTER II-Kourovka optical observations
  35. GRB 090408: Swift detection of a burst
  36. GRB 090407: Swift-XRT refined analysis
  37. GRB 090407: Swift UVOT Upper Limits
  38. GRB 090407: Enhanced Swift-XRT position
  39. GRB 090407: Swift-BAT refined analysis
  40. GRB 090407: ROTSE-III Optical Limits
  41. GRB 090407: Swift detection of a burst
  42. GRB 090404: millimeter detection
  43. GRB 090404: nIR observations at Calar Alto
  44. GRB 090405: Fermi GBM Detection
  45. GRB 090403: Fermi GBM detection
  46. Swift/UVOT observations of GRB090404
  47. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  48. GRB 090404: Swift-XRT Team refined analysis
  49. GRB 090404: Swift-BAT refined analysis
  50. GRB 090404: Enhanced Swift-XRT position
  51. GRB 090404: Swift detection of a burst
  52. GRB 090401A: Suzaku WAM observation of the prompt emission
  53. GRB 090401B: Suzaku WAM observation of the prompt emission
  54. Konus-Wind observation of GRB 090401B
  55. GRB 090401B: VLA radio upper limit
  56. GRB090401B, RIMOTS optical upper limits
  57. Swift/UVOT observations of GRB090401B
  58. GRB 090401B: AGILE refined analysis
  59. Swift/UVOT observations of GRB090401B
  60. GRB 090401B: Swift XRT Refined Analysis
  61. GRB 090331: Fermi GBM detection
  62. Konus-Wind observation of GRB 090401A
  63. GRB 090401B: Enhanced Swift-XRT position
  64. AGILE Gamma-ray detection of GRB 090401B
  65. GRB 090401B: Swift-BAT refined analysis
  66. Swift/UVOT detection of GRB090401B
  67. GRB 090401B: Swift detection of a burst
  68. GRB 090401, Swift-BAT refined analysis
  69. GRB 090323: Further TLS detections - a break?
  70. GRB 090401: Swift detection of a burst
  71. GRB 090328: Radio afterglow detection
  72. GRB 090326: Fermi GBM detection
  73. GRB 090328: BOOTES-3 optical observations
  74. GRB 090328B: Fermi GBM Detection
  75. GRB 090330: Fermi GBM detection
  76. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  77. GRB 090328: Swift XRT refined analysis
  78. GRB 090328: Swift UVOT observations
  79. GRB 090323: WSRT Radio Detection
  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: Radio afterglow detection
  84. GRB 090323: TLS detection at 5 days, no break
  85. GRB 090327: Fermi GBM detection
  86. GRB 090323 TLS detection - still bright
  87. GRB 090323: UVOT Detection of Afterglow
  88. GRB 090323: Swift-XRT refined analysis
  89. GRB 090323: GROND Detection of the Afterglow and Photo-z
  90. GRB 090323: Possible XRT Counterpart
  91. GRB 090320C: Fermi GBM Detection
  92. GRB 090320B: Fermi GBM detection.
  93. GRB 090319: Fermi GBM detection
  94. GRB 090320A: Fermi GBM detection
  95. GRB 090313: WSRT Radio Detection
  96. X-shooter observations of GRB 090313
  97. GRB 090313: VLT spectroscopy
  98. GRB090313: radio detection with the VLA
  99. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  100. Further Swift/UVOT observations of GRB 090313

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