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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"

45443 results found.

  1. GRB 081206C: Fermi GBM detection
  2. Radio observation of GRB 081121 with ATCA
  3. Radio observation of GRB 081118 with ATCA
  4. GRB 081206B: Fermi GBM detection
  5. GRB 081206: Fermi GBM detection
  6. GRB 081128: afterglow observations
  7. GRB 081203B: Suzaku WAM observation of the prompt emission
  8. GRB 081203B: Additional Gemini imaging
  9. Radio observation of GRB 081109 with ATCA
  10. Radio observation of GRB 081104 with ATCA
  11. Radio observation of GRB 081029 with ATCA
  12. Radio observation of GRB 081008 with ATCA
  13. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  14. GRB 081203B: Gemini observations
  15. GRB 081128: optical observation in CrAO
  16. GRB081203A: Optical observations at Ishigaki
  17. GRB 081128: Optical afterglow observations
  18. GRB 081204: GROND Observations
  19. GRB081203B: optical observations
  20. Radio detection of GRB 081203B with the VLA
  21. GRB 081204: Magellan observations
  22. GRB081203A: Radio upper limit at 15 GHz
  23. GRB 081204B: Fermi GBM detection
  24. GRB 081204: Swift/UVOT Upper Limits
  25. GRB 081204: Swift XRT afterglow confirmation
  26. GRB081203A: MITSuME optical observation
  27. GRB 081203A: Optical observations of Xinglong TNT telescope
  28. GRB 081203A: Skynet/GORT Detections
  29. GRB 081204: Swift XRT afterglow candidate
  30. GRB081203A: optical observation
  31. GRB 081204 : a long GRB localized by INTEGRAL
  32. VLA Radio upper limit on GRB 081203A
  33. Swift-XRT observations of GRB 081203B
  34. Konus-Wind observation of GRB 081203A
  35. Konus-Wind observation of GRB 081203B
  36. GRB081203A: Swift-XRT refined analysis
  37. GRB 081203B: optical observations
  38. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  39. Swift/UVOT detection of GRB081203B
  40. GRB 081203B: Swift-XRT candidate afterglow.
  41. GRB 081203A: optical observations
  42. Swift UVOT observations of GRB 081203A
  43. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  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 081203: Enhanced Swift-XRT position
  48. GRB 081130B: MASTER prompt optical observations
  49. GRB081203: optical observation
  50. GRB 081203: Swift detection of a burst with a bright optical counterpart
  51. GRB 081128: optical observation
  52. GRB 081130B: Fermi GBM detection
  53. GRB 081130: Fermi GBM detection
  54. Swift Trigger 335971: Swift/UVOT Observations
  55. GRB 081126: afterglow photometry
  56. GRB 081126: Fermi GBM detection
  57. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  58. VLA Radio upper limit on GRB 081126
  59. GRB 081129: Fermi GBM detection
  60. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  61. GRB 081128A: optical observations
  62. Swift Trigger 335971 is probably not a real source
  63. Trigger 335971: Swift possible detection of a burst
  64. GRB081128: Swift/UVOT Upper Limits
  65. SGR 1806-20: Fermi GBM detection.
  66. GRB 081122B: Fermi GBM Detection
  67. GRB 081128: Swift-XRT refined analysis
  68. GRB 081128: Liverpool Telescope afterglow confirmation
  69. GRB081128: optical observations
  70. GRB081128 : Lulin optical follow-ups
  71. GRB 081128: Swift-BAT refined analysis
  72. GRB 081128: Enhanced Swift-XRT position
  73. GRB 081128: Optical observation of xinglong TNT
  74. GRB 081128: Swift detection of a burst
  75. GRB 081126: Swift observations continuing
  76. GRB081126: Afterglow photometry from Crni Vrh
  77. GRB 081126: GRT Optical Observation
  78. GRB 081127: Swift/UVOT Upper Limits
  79. GRB 081127: Swift-XRT refined analysis
  80. GRB 081127: Enhanced Swift-XRT position
  81. GRB 081126: Confirmation of the Optical Afterglow
  82. GRB 081127: Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 081126
  84. GRB 081126: Swift-XRT refined analysis
  85. GRB 081127: Swift detection of a burst
  86. GRB 081126: Swift/UVOT Observations
  87. GRB 081126: optical observations
  88. GRB 081126: Swift-BAT refined analysis
  89. GRB 081126: Enhanced Swift-XRT position
  90. GRB 081126: TAROT Calern observatory optical observations
  91. GRB 081126: Swift detection of a burst
  92. GRB 081125: Fermi GBM detection
  93. GRB 081124: Fermi GBM detection
  94. GRB 081120: Fermi GBM detection
  95. GRB 081118: Fermi GBM detection.
  96. GRB 081122: Fermi GBM detection
  97. Konus-Wind observation of GRB 081121
  98. GRB 081121, SMARTS optical/IR afterglow observations
  99. GRB081121: Fermi GBM detection
  100. Fermi GBM detection of a weak source

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