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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"

27391 results found.

  1. GRB 081213: Fermi GBM detection
  2. Possible GRB 081211B - Swift-XRT analysis
  3. GRB 081207: Fermi GBM detection
  4. GRB 081209: Fermi GBM detection
  5. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  6. GRB 081210, SMARTS optical/IR observations
  7. GRB 081211: Swift-BAT refined analysis
  8. GRB 081211: Swift XRT refined analysis
  9. GRB 081211: Enhanced Swift-XRT position
  10. GRB 081211: Swift detection of a burst
  11. GRB 081210: Swift-XRT refined analysis
  12. GRB081203B: optical observations
  13. GRB 081210: Enhanced Swift-XRT position
  14. GRB 081210: Swift-BAT refined analysis
  15. GRB 081210: Swift detection of a burst with optical afterglow
  16. IPN triangulation of short hard GRB 081209
  17. GRB 081203A: optical observations
  18. GRB 081206C: Fermi GBM detection
  19. Radio observation of GRB 081121 with ATCA
  20. Radio observation of GRB 081118 with ATCA
  21. GRB 081206B: Fermi GBM detection
  22. GRB 081206: Fermi GBM detection
  23. GRB 081128: afterglow observations
  24. GRB 081203B: Suzaku WAM observation of the prompt emission
  25. Radio observation of GRB 081109 with ATCA
  26. Radio observation of GRB 081104 with ATCA
  27. Radio observation of GRB 081029 with ATCA
  28. Radio observation of GRB 081008 with ATCA
  29. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  30. GRB081203A: Optical observations at Ishigaki
  31. GRB 081204: GROND Observations
  32. Radio detection of GRB 081203B with the VLA
  33. GRB081203A: Radio upper limit at 15 GHz
  34. GRB 081204B: Fermi GBM detection
  35. GRB 081204: Swift/UVOT Upper Limits
  36. GRB 081204: Swift XRT afterglow confirmation
  37. GRB081203A: MITSuME optical observation
  38. GRB081203A: optical observation
  39. GRB 081204 : a long GRB localized by INTEGRAL
  40. VLA Radio upper limit on GRB 081203A
  41. Swift-XRT observations of GRB 081203B
  42. GRB081203A: Swift-XRT refined analysis
  43. GRB 081203B: optical observations
  44. Swift/UVOT detection of GRB081203B
  45. GRB 081203B: Swift-XRT candidate afterglow.
  46. GRB 081203A: optical observations
  47. GRB081203A: Swift/UVOT grism redshift
  48. GRB 081203A: Burst detection from Swift-BAT slew data
  49. GRB 081203A: Swift-BAT refined analysis
  50. GRB 081203: Enhanced Swift-XRT position
  51. GRB 081130B: MASTER prompt optical observations
  52. GRB081203: optical observation
  53. GRB 081203: Swift detection of a burst with a bright optical counterpart
  54. GRB 081130B: Fermi GBM detection
  55. GRB 081130: Fermi GBM detection
  56. Swift Trigger 335971: Swift/UVOT Observations
  57. GRB 081126: afterglow photometry
  58. GRB 081126: Fermi GBM detection
  59. VLA Radio upper limit on GRB 081126
  60. GRB 081129: Fermi GBM detection
  61. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  62. GRB 081128A: optical observations
  63. Trigger 335971: Swift possible detection of a burst
  64. GRB081128: Swift/UVOT Upper Limits
  65. GRB 081122B: Fermi GBM Detection
  66. GRB 081128: Swift-XRT refined analysis
  67. GRB 081128: Liverpool Telescope afterglow confirmation
  68. GRB081128: optical observations
  69. GRB 081128: Swift-BAT refined analysis
  70. GRB 081128: Enhanced Swift-XRT position
  71. GRB 081128: Optical observation of xinglong TNT
  72. GRB 081128: Swift detection of a burst
  73. GRB081126: Afterglow photometry from Crni Vrh
  74. GRB 081126: GRT Optical Observation
  75. GRB 081127: Swift/UVOT Upper Limits
  76. GRB 081127: Swift-XRT refined analysis
  77. GRB 081127: Enhanced Swift-XRT position
  78. GRB 081127: Swift-BAT refined analysis
  79. GRB 081126: Swift-XRT refined analysis
  80. GRB 081127: Swift detection of a burst
  81. GRB 081126: Swift/UVOT Observations
  82. GRB 081126: optical observations
  83. GRB 081126: Swift-BAT refined analysis
  84. GRB 081126: Enhanced Swift-XRT position
  85. GRB 081126: TAROT Calern observatory optical observations
  86. GRB 081126: Swift detection of a burst
  87. GRB 081125: Fermi GBM detection
  88. GRB 081124: Fermi GBM detection
  89. GRB 081120: Fermi GBM detection
  90. GRB 081118: Fermi GBM detection.
  91. GRB 081122: Fermi GBM detection
  92. GRB 081121, SMARTS optical/IR afterglow observations
  93. Fermi GBM detection of a weak source
  94. GRB081121: Refined Swift/UVOT observations
  95. GRB 081121: Swift-XRT refined analysis
  96. GRB 081121: Enhanced Swift-XRT position
  97. GRB 081121: GROND observations
  98. GRB 081121: Swift-BAT refined analysis
  99. GRB081121: Swift/UVOT observations
  100. GRB 081121: ROTSE-III Detection of Optical Counterpart

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