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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"

27029 results found.

  1. GRB081222, optical observation
  2. GRB081222: Swift/UVOT detection of an optical afterglow
  3. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  4. GRB 081222: Swift detection of a burst with a bright optical afterglow
  5. GRB 081221: Swift detection of a burst
  6. GRB 081217: Fermi GBM detection
  7. Modification of Swift/UVOT response to bright GRBs
  8. GRB 081215B: Fermi GBM detection
  9. GRB 081216: Suzaku WAM observation of the prompt emission
  10. GRB 081216 : Fermi GBM observation
  11. GRB 081215A: Fermi GBM detection
  12. IPN localization of short hard GRB 081216
  13. GRB 081118: Zadko observations
  14. GRB 081213: Fermi GBM detection
  15. GRB 081207: Fermi GBM detection
  16. GRB 081209: Fermi GBM detection
  17. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  18. GRB 081211: Swift-BAT refined analysis
  19. GRB 081211: Swift XRT refined analysis
  20. GRB 081211: Swift/UVOT detection of an optical afterglow
  21. GRB 081210: Swift/UVOT refined analysis
  22. GRB 081211: Swift detection of a burst
  23. GRB 081210: Swift-XRT refined analysis
  24. GRB 081210: Swift-BAT refined analysis
  25. GRB 081210: Swift detection of a burst with optical afterglow
  26. Konus-Wind observation of GRB 081209
  27. IPN triangulation of short hard GRB 081209
  28. GRB 081206C: Fermi GBM detection
  29. GRB 081206B: Fermi GBM detection
  30. GRB 081206: Fermi GBM detection
  31. GRB 081203B: Suzaku WAM observation of the prompt emission
  32. GRB081203A: Optical observations at Ishigaki
  33. GRB 081204: GROND Observations
  34. GRB 081204B: Fermi GBM detection
  35. GRB 081204: Swift XRT afterglow confirmation
  36. GRB081203A: MITSuME optical observation
  37. GRB 081203A: Skynet/GORT Detections
  38. GRB 081204: Swift XRT afterglow candidate
  39. Konus-Wind observation of GRB 081203A
  40. GRB081203A: Swift-XRT refined analysis
  41. Swift/UVOT detection of GRB081203B
  42. GRB 081203B: Swift-XRT candidate afterglow.
  43. Swift UVOT observations of GRB 081203A
  44. GRB081203A: Swift/UVOT grism redshift
  45. GRB 081203A: Burst detection from Swift-BAT slew data
  46. GRB 081203A: Swift-BAT refined analysis
  47. GRB 081130B: MASTER prompt optical observations
  48. GRB 081203: Swift detection of a burst with a bright optical counterpart
  49. GRB 081130B: Fermi GBM detection
  50. GRB 081130: Fermi GBM detection
  51. Swift Trigger 335971: Swift/UVOT Observations
  52. GRB 081126: Fermi GBM detection
  53. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  54. GRB 081129: Fermi GBM detection
  55. Swift Trigger 335971 is probably not a real source
  56. Trigger 335971: Swift possible detection of a burst
  57. GRB081128: Swift/UVOT Upper Limits
  58. SGR 1806-20: Fermi GBM detection.
  59. GRB 081122B: Fermi GBM Detection
  60. GRB 081128: Swift-XRT refined analysis
  61. GRB 081128: Swift-BAT refined analysis
  62. GRB 081128: Swift detection of a burst
  63. GRB 081126: GRT Optical Observation
  64. GRB 081127: Swift/UVOT Upper Limits
  65. GRB 081127: Swift-BAT refined analysis
  66. GRB 081126: Swift-XRT refined analysis
  67. GRB 081127: Swift detection of a burst
  68. GRB 081126: Swift/UVOT Observations
  69. GRB 081126: optical observations
  70. GRB 081126: Swift-BAT refined analysis
  71. GRB 081126: TAROT Calern observatory optical observations
  72. GRB 081126: Swift detection of a burst
  73. GRB 081125: Fermi GBM detection
  74. GRB 081124: Fermi GBM detection
  75. GRB 081120: Fermi GBM detection
  76. GRB 081118: Fermi GBM detection.
  77. GRB 081122: Fermi GBM detection
  78. Konus-Wind observation of GRB 081121
  79. GRB081121: Fermi GBM detection
  80. Fermi GBM detection of a weak source
  81. GRB081121: Refined Swift/UVOT observations
  82. GRB 081121: Swift-XRT refined analysis
  83. GRB 081121: GROND observations
  84. GRB 081121: Swift-BAT refined analysis
  85. GRB081121: Swift/UVOT observations
  86. GRB 081121: Swift detection of a burst
  87. GRB 081121: ROTSE-III Detection of Optical Counterpart
  88. GRB081118 : optical upper limit
  89. GRB 081119: Fermi GBM detection
  90. GRB 081118: Swift-XRT refined analysis
  91. GRB 081118: GROND detection of afterglow
  92. GRB 081118: Swift UVOT Upper Limits
  93. GRB 081118: Swift-BAT refined analysis
  94. GRB 081118: Swift detection of a burst
  95. Further Swift-XRT observations of the probable GRB 081105.
  96. GRB 081113: Fermi GBM detection
  97. GRB 081110: Fermi GBM detection
  98. GRB 081110: MASTER: first optical observations Fermi GRB
  99. GRB 081109: TAROT La Silla observatory optical observations
  100. GRB 081102: MASTER refind and final results

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