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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"

27394 results found.

  1. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  2. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  3. Possible GRB 081211B: Swift/UVOT Upper Limits
  4. GRB 081213: Fermi GBM detection
  5. Possible GRB 081211B - Swift-XRT analysis
  6. GRB 081207: Fermi GBM detection
  7. GRB 081209: Fermi GBM detection
  8. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  9. GRB 081210, SMARTS optical/IR observations
  10. GRB 081211: Swift-BAT refined analysis
  11. GRB 081211: Swift XRT refined analysis
  12. GRB 081211: Enhanced Swift-XRT position
  13. GRB 081211: Swift detection of a burst
  14. GRB 081210: Swift-XRT refined analysis
  15. GRB081203B: optical observations
  16. GRB 081210: Enhanced Swift-XRT position
  17. GRB 081210: Swift-BAT refined analysis
  18. GRB 081210: Swift detection of a burst with optical afterglow
  19. IPN triangulation of short hard GRB 081209
  20. GRB 081203A: optical observations
  21. GRB 081206C: Fermi GBM detection
  22. Radio observation of GRB 081121 with ATCA
  23. Radio observation of GRB 081118 with ATCA
  24. GRB 081206B: Fermi GBM detection
  25. GRB 081206: Fermi GBM detection
  26. GRB 081128: afterglow observations
  27. GRB 081203B: Suzaku WAM observation of the prompt emission
  28. Radio observation of GRB 081109 with ATCA
  29. Radio observation of GRB 081104 with ATCA
  30. Radio observation of GRB 081029 with ATCA
  31. Radio observation of GRB 081008 with ATCA
  32. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  33. GRB081203A: Optical observations at Ishigaki
  34. GRB 081204: GROND Observations
  35. Radio detection of GRB 081203B with the VLA
  36. GRB081203A: Radio upper limit at 15 GHz
  37. GRB 081204B: Fermi GBM detection
  38. GRB 081204: Swift/UVOT Upper Limits
  39. GRB 081204: Swift XRT afterglow confirmation
  40. GRB081203A: MITSuME optical observation
  41. GRB081203A: optical observation
  42. GRB 081204 : a long GRB localized by INTEGRAL
  43. VLA Radio upper limit on GRB 081203A
  44. Swift-XRT observations of GRB 081203B
  45. GRB081203A: Swift-XRT refined analysis
  46. GRB 081203B: optical observations
  47. Swift/UVOT detection of GRB081203B
  48. GRB 081203B: Swift-XRT candidate afterglow.
  49. GRB 081203A: optical observations
  50. GRB081203A: Swift/UVOT grism redshift
  51. GRB 081203A: Burst detection from Swift-BAT slew data
  52. GRB 081203A: Swift-BAT refined analysis
  53. GRB 081203: Enhanced Swift-XRT position
  54. GRB 081130B: MASTER prompt optical observations
  55. GRB081203: optical observation
  56. GRB 081203: Swift detection of a burst with a bright optical counterpart
  57. GRB 081130B: Fermi GBM detection
  58. GRB 081130: Fermi GBM detection
  59. Swift Trigger 335971: Swift/UVOT Observations
  60. GRB 081126: afterglow photometry
  61. GRB 081126: Fermi GBM detection
  62. VLA Radio upper limit on GRB 081126
  63. GRB 081129: Fermi GBM detection
  64. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  65. GRB 081128A: optical observations
  66. Trigger 335971: Swift possible detection of a burst
  67. GRB081128: Swift/UVOT Upper Limits
  68. GRB 081122B: Fermi GBM Detection
  69. GRB 081128: Swift-XRT refined analysis
  70. GRB 081128: Liverpool Telescope afterglow confirmation
  71. GRB081128: optical observations
  72. GRB 081128: Swift-BAT refined analysis
  73. GRB 081128: Enhanced Swift-XRT position
  74. GRB 081128: Optical observation of xinglong TNT
  75. GRB 081128: Swift detection of a burst
  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 081127: Swift-BAT refined analysis
  82. GRB 081126: Swift-XRT refined analysis
  83. GRB 081127: Swift detection of a burst
  84. GRB 081126: Swift/UVOT Observations
  85. GRB 081126: optical observations
  86. GRB 081126: Swift-BAT refined analysis
  87. GRB 081126: Enhanced Swift-XRT position
  88. GRB 081126: TAROT Calern observatory optical observations
  89. GRB 081126: Swift detection of a burst
  90. GRB 081125: Fermi GBM detection
  91. GRB 081124: Fermi GBM detection
  92. GRB 081120: Fermi GBM detection
  93. GRB 081118: Fermi GBM detection.
  94. GRB 081122: Fermi GBM detection
  95. GRB 081121, SMARTS optical/IR afterglow observations
  96. Fermi GBM detection of a weak source
  97. GRB081121: Refined Swift/UVOT observations
  98. GRB 081121: Swift-XRT refined analysis
  99. GRB 081121: Enhanced Swift-XRT position
  100. GRB 081121: GROND observations

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