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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"

29112 results found.

  1. GRB 081109A, Swift-BAT refined analysis
  2. GRB 081109A: Swift-XRT refined analysis
  3. GRB 081109: Fermi GBM detection
  4. GRB 081109: Swift/UVOT upper limits
  5. Swift-BAT Trigger 334129: possible burst
  6. GRB 081109: Swift detection of a burst
  7. GRB 081028 - PAIRITEL NIR detection
  8. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  9. SGR 1806-20: Fermi GBM detection
  10. GRB 081102B: Fermi GBM detection
  11. GRB 081105B: Fermi GBM detection
  12. GRB 081107: Fermi GBM detection
  13. GRB 081104: GROND found no Optical/NIR Afterglow
  14. GRB 081105: GROND Upper Limits
  15. UVOT/Swift observations of GRB081105
  16. Swift-XRT observations of GRB 081105
  17. GRB 081101B: Fermi GBM detection
  18. GRB 081105 Swift/BAT and IPN Localization
  19. GRB 081025: Fermi GBM observation
  20. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  21. GRB 081104: refined XRT analysis
  22. GRB 081104: Swift-BAT refined analysis
  23. GRB081104: Swift/UVOT Upper Limits
  24. Fermi-GBM detection of a Solar Flare
  25. Fermi Detection of GRB 081102
  26. GRB 081104 : Faulkes Telescope South observations
  27. GRB 081104: Swift-XRT position
  28. GRB 081104: Swift detection of a burst
  29. GRB 081102: MASTER prompt optical limit
  30. GRB 081102: Swift-XRT refined analysis
  31. GRB 081102: Swift/UVOT refined analysis
  32. GRB 081102: Swift-BAT refined analysis
  33. GRB 081102: Swift detection of a burst
  34. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  35. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  36. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  37. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  38. GRB 081024B: new Swift-XRT observations
  39. GRB 081024B: VLA radio observation
  40. GRB 081029: UVOT Detection of the Optical Afterglow
  41. GRB 081029: PROMPT Detections
  42. GRB 081029: Swift-BAT refined analysis
  43. GRB 081024B: Suzaku WAM observation of the prompt emission
  44. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  45. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  46. GRB 081029: ROTSE-III Detection of Optical Counterpart
  47. GRB 081029: Swift detection of a burst
  48. GRB 081028B: Fermi GBM detection
  49. GRB 081021: Fermi GBM detection
  50. GRB081028: UVOT detection of a brightening afterglow
  51. Swift UVOT observations of GRB081028
  52. GRB 081028: Swift-XRT refined analysis
  53. GRB 081028, Swift-BAT refined analysis
  54. GRB 081028: TAROT Calern observatory optical observations
  55. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  56. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  57. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  58. GRB 081028: Swift detection of a burst
  59. GRB 081024B: Swift-XRT further observations
  60. Swift UVOT observations of GRB081025
  61. Swift UVOT observations of GRB081024B
  62. GRB 081025: Swift-XRT position
  63. GRB 081024B: Swift-XRT observations
  64. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  65. Fermi-LAT observation of GRB 081024B
  66. Swift UVOT observations of GRB 081024
  67. GRB 081024, Swift-BAT refined analysis
  68. GRB 081024: Faulkes Telescope North optical observations
  69. GRB 081024: Early Super-LOTIS Observations
  70. GRB 081024A: ROTSE-III Optical Limits
  71. GRB 081024: Swift detection of a burst
  72. GRB 081022, Swift-BAT refined analysis
  73. GRB 081016A: Swift-XRT refined analysis
  74. GRB 081022: Swift detection of a burst
  75. Swift trigger 332287 is not a GRB
  76. Swift detection of a possible burst (trigger 332287)
  77. GRB 081017, Swift-BAT refined analysis
  78. GRB 081017: Swift detection of a burst
  79. GRB 081016B, Swift-BAT refined analysis
  80. GRB 081016B: Swift/UVOT Upper Limits
  81. GRB 081011: Swift XRT refined analysis
  82. GRB 081016B: Swift-XRT Team refined Analysis
  83. GRB 081016B: ROTSE-III Optical Limits
  84. GRB 081016B: Swift detection of a burst
  85. GRB 081016: Swift-XRT candidate afterglow detection
  86. Swift detection of flare on CC Eri
  87. Trigger 331721 Due to Swift startracker loss-of-lock
  88. Detection of flare star Algol in Swift-BAT slew data
  89. GRB 081009: Fermi GBM detection
  90. GRB 081012: GROND upper limits
  91. Swift-BAT triggered on the flare star Algol
  92. GRB 081012: Fermi GBM detection
  93. GRB 081007 and GRB 081007B: Fermi GBM detection
  94. GRB 081012: Swift/UVOT analysis of initial observations
  95. GRB 081012: Swift/XRT detection
  96. GRB 081012, Swift-BAT refined analysis
  97. GRB 081012: ROTSE-III Optical Limits
  98. GRB 081012: Swift detection of a burst
  99. GRB081011: UVOT detection of an optical afterglow
  100. GRB 081011: Swift/XRT detection

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