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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"

29139 results found.

  1. Fermi GBM detection of a weak source
  2. GRB081121: Refined Swift/UVOT observations
  3. GRB 081121: Swift-XRT refined analysis
  4. GRB 081121: GROND observations
  5. GRB 081121: Swift-BAT refined analysis
  6. GRB081121: Swift/UVOT observations
  7. GRB 081121: Swift detection of a burst
  8. GRB 081121: ROTSE-III Detection of Optical Counterpart
  9. GRB081118 : optical upper limit
  10. GRB 081119: Fermi GBM detection
  11. GRB 081118: Swift-XRT refined analysis
  12. GRB 081118: GROND detection of afterglow
  13. GRB 081118: Swift UVOT Upper Limits
  14. GRB 081118: Swift-BAT refined analysis
  15. GRB 081118: Swift detection of a burst
  16. Further Swift-XRT observations of the probable GRB 081105.
  17. GRB 081113: Fermi GBM detection
  18. GRB 081110: Fermi GBM detection
  19. GRB 081110: MASTER: first optical observations Fermi GRB
  20. GRB 081109: TAROT La Silla observatory optical observations
  21. GRB 081102: MASTER refind and final results
  22. GRB 081109: GROND redshift limit and host extinction
  23. GRB 081024B: Swift-XRT late-time observations
  24. Swift-BAT refined analysis of trigger 334129
  25. GRB 081109B: Swift/UVOT refined analysis
  26. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  27. GRB 081109A: Possible Swift-UVOT detection
  28. GRB 081109A, Swift-BAT refined analysis
  29. GRB 081109A: Swift-XRT refined analysis
  30. GRB 081109: Fermi GBM detection
  31. GRB 081109: Swift/UVOT upper limits
  32. Swift-BAT Trigger 334129: possible burst
  33. GRB 081109: Swift detection of a burst
  34. GRB 081028 - PAIRITEL NIR detection
  35. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  36. SGR 1806-20: Fermi GBM detection
  37. GRB 081102B: Fermi GBM detection
  38. GRB 081105B: Fermi GBM detection
  39. GRB 081107: Fermi GBM detection
  40. GRB 081104: GROND found no Optical/NIR Afterglow
  41. GRB 081105: GROND Upper Limits
  42. UVOT/Swift observations of GRB081105
  43. Swift-XRT observations of GRB 081105
  44. GRB 081101B: Fermi GBM detection
  45. GRB 081105 Swift/BAT and IPN Localization
  46. GRB 081025: Fermi GBM observation
  47. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  48. GRB 081104: refined XRT analysis
  49. GRB 081104: Swift-BAT refined analysis
  50. GRB081104: Swift/UVOT Upper Limits
  51. Fermi-GBM detection of a Solar Flare
  52. Fermi Detection of GRB 081102
  53. GRB 081104 : Faulkes Telescope South observations
  54. GRB 081104: Swift-XRT position
  55. GRB 081104: Swift detection of a burst
  56. GRB 081102: MASTER prompt optical limit
  57. GRB 081102: Swift-XRT refined analysis
  58. GRB 081102: Swift/UVOT refined analysis
  59. GRB 081102: Swift-BAT refined analysis
  60. GRB 081102: Swift detection of a burst
  61. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  62. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  63. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  64. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  65. GRB 081024B: new Swift-XRT observations
  66. GRB 081024B: VLA radio observation
  67. GRB 081029: UVOT Detection of the Optical Afterglow
  68. GRB 081029: PROMPT Detections
  69. GRB 081029: Swift-BAT refined analysis
  70. GRB 081024B: Suzaku WAM observation of the prompt emission
  71. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  72. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  73. GRB 081029: ROTSE-III Detection of Optical Counterpart
  74. GRB 081029: Swift detection of a burst
  75. GRB 081028B: Fermi GBM detection
  76. GRB 081021: Fermi GBM detection
  77. GRB081028: UVOT detection of a brightening afterglow
  78. Swift UVOT observations of GRB081028
  79. GRB 081028: Swift-XRT refined analysis
  80. GRB 081028, Swift-BAT refined analysis
  81. GRB 081028: TAROT Calern observatory optical observations
  82. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  83. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  84. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  85. GRB 081028: Swift detection of a burst
  86. GRB 081024B: Swift-XRT further observations
  87. Swift UVOT observations of GRB081025
  88. Swift UVOT observations of GRB081024B
  89. GRB 081025: Swift-XRT position
  90. GRB 081024B: Swift-XRT observations
  91. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  92. Fermi-LAT observation of GRB 081024B
  93. Swift UVOT observations of GRB 081024
  94. GRB 081024, Swift-BAT refined analysis
  95. GRB 081024: Faulkes Telescope North optical observations
  96. GRB 081024: Early Super-LOTIS Observations
  97. GRB 081024A: ROTSE-III Optical Limits
  98. GRB 081024: Swift detection of a burst
  99. GRB 081022, Swift-BAT refined analysis
  100. GRB 081016A: Swift-XRT refined analysis

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