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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27289 results found.

  1. GRB 081210: optical observations
  2. Possible GRB 081211B - Swift-XRT analysis
  3. GRB 081207: Fermi GBM detection
  4. GRB 081209: Fermi GBM detection
  5. GRB 081007: Detection of a Supernova
  6. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  7. GRB 081211: Swift-BAT refined analysis
  8. GRB 081211: Swift XRT refined analysis
  9. GRB 081211: Swift/UVOT detection of an optical afterglow
  10. GRB 081211: Enhanced Swift-XRT position
  11. GRB 081210: Swift/UVOT refined analysis
  12. GRB 081211: Swift detection of a burst
  13. GRB 081210: Swift-XRT refined analysis
  14. GRB 081210: Enhanced Swift-XRT position
  15. GRB 081210: Swift-BAT refined analysis
  16. GRB 081210: Swift detection of a burst with optical afterglow
  17. IPN triangulation of short hard GRB 081209
  18. GRB 081206C: Fermi GBM detection
  19. Radio observation of GRB 081121 with ATCA
  20. GRB 081206B: Fermi GBM detection
  21. GRB 081206: Fermi GBM detection
  22. GRB 081128: afterglow observations
  23. GRB 081203B: Suzaku WAM observation of the prompt emission
  24. Radio observation of GRB 081029 with ATCA
  25. Radio observation of GRB 081008 with ATCA
  26. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  27. GRB 081128: optical observation in CrAO
  28. GRB 081128: Optical afterglow observations
  29. GRB 081204: GROND Observations
  30. Radio detection of GRB 081203B with the VLA
  31. GRB081203A: Radio upper limit at 15 GHz
  32. GRB 081204B: Fermi GBM detection
  33. GRB 081204: Swift/UVOT Upper Limits
  34. GRB 081204: Swift XRT afterglow confirmation
  35. GRB 081204: Swift XRT afterglow candidate
  36. Swift-XRT observations of GRB 081203B
  37. Konus-Wind observation of GRB 081203A
  38. Konus-Wind observation of GRB 081203B
  39. GRB081203A: Swift-XRT refined analysis
  40. GRB 081203B: optical observations
  41. Swift/UVOT detection of GRB081203B
  42. GRB 081203B: Swift-XRT candidate afterglow.
  43. GRB 081203A: optical observations
  44. Swift UVOT observations of GRB 081203A
  45. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  46. GRB081203A: Swift/UVOT grism redshift
  47. GRB 081203A: Burst detection from Swift-BAT slew data
  48. GRB 081203A: Swift-BAT refined analysis
  49. GRB 081203: Enhanced Swift-XRT position
  50. GRB081203: optical observation
  51. GRB 081203: Swift detection of a burst with a bright optical counterpart
  52. GRB 081128: optical observation
  53. GRB 081130B: Fermi GBM detection
  54. GRB 081130: Fermi GBM detection
  55. Swift Trigger 335971: Swift/UVOT Observations
  56. GRB 081126: Fermi GBM detection
  57. GRB 081129: Fermi GBM detection
  58. Swift Trigger 335971 is probably not a real source
  59. Trigger 335971: Swift possible detection of a burst
  60. GRB081128: Swift/UVOT Upper Limits
  61. SGR 1806-20: Fermi GBM detection.
  62. GRB 081122B: Fermi GBM Detection
  63. GRB 081128: Swift-XRT refined analysis
  64. GRB081128: optical observations
  65. GRB 081128: Swift-BAT refined analysis
  66. GRB 081128: Enhanced Swift-XRT position
  67. GRB 081128: Swift detection of a burst
  68. GRB 081126: Swift observations continuing
  69. GRB081126: Afterglow photometry from Crni Vrh
  70. GRB 081126: GRT Optical Observation
  71. GRB 081127: Swift/UVOT Upper Limits
  72. GRB 081127: Swift-XRT refined analysis
  73. GRB 081127: Enhanced Swift-XRT position
  74. GRB 081126: Confirmation of the Optical Afterglow
  75. GRB 081127: Swift-BAT refined analysis
  76. GRB 081126: Swift-XRT refined analysis
  77. GRB 081127: Swift detection of a burst
  78. GRB 081126: Swift/UVOT Observations
  79. GRB 081126: optical observations
  80. GRB 081126: Swift-BAT refined analysis
  81. GRB 081126: Enhanced Swift-XRT position
  82. GRB 081126: TAROT Calern observatory optical observations
  83. GRB 081126: Swift detection of a burst
  84. GRB 081125: Fermi GBM detection
  85. GRB 081124: Fermi GBM detection
  86. GRB 081120: Fermi GBM detection
  87. GRB 081118: Fermi GBM detection.
  88. GRB 081122: Fermi GBM detection
  89. Konus-Wind observation of GRB 081121
  90. GRB081121: Fermi GBM detection
  91. Fermi GBM detection of a weak source
  92. GRB081121: Refined Swift/UVOT observations
  93. GRB 081121: Swift-XRT refined analysis
  94. GRB 081121: Enhanced Swift-XRT position
  95. GRB 081121: GROND observations
  96. GRB 081121: Swift-BAT refined analysis
  97. GRB081121: Swift/UVOT observations
  98. GRB 081121: Swift detection of a burst
  99. GRB 081121: ROTSE-III Detection of Optical Counterpart
  100. GRB081118 : optical upper limit

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