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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19608 results found.

  1. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  2. GRB081222, optical observation
  3. GRB081222: Swift/UVOT detection of an optical afterglow
  4. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  5. GRB 081222: Swift detection of a burst with a bright optical afterglow
  6. GRB 081221: Enhanced Swift-XRT position
  7. GRB 081221: Swift detection of a burst
  8. Modification of Swift/UVOT response to bright GRBs
  9. GRB 081211B: Further Swift-XRT analysis
  10. GRB 081211B - possibly a short burst with extended emission
  11. Possible GRB 081211B: Swift/UVOT Upper Limits
  12. GRB 081210: optical observations
  13. Possible GRB 081211B - Swift-XRT analysis
  14. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  15. GRB 081211: Swift-BAT refined analysis
  16. GRB 081211: Swift XRT refined analysis
  17. GRB 081211: Swift/UVOT detection of an optical afterglow
  18. GRB 081211: Enhanced Swift-XRT position
  19. GRB 081210: Swift/UVOT refined analysis
  20. GRB 081211: Swift detection of a burst
  21. GRB 081210: Swift-XRT refined analysis
  22. GRB 081210: Enhanced Swift-XRT position
  23. GRB 081210: Swift-BAT refined analysis
  24. GRB 081210: Swift detection of a burst with optical afterglow
  25. IPN triangulation of short hard GRB 081209
  26. Radio observation of GRB 081121 with ATCA
  27. GRB 081203B: Suzaku WAM observation of the prompt emission
  28. Radio observation of GRB 081029 with ATCA
  29. Radio observation of GRB 081008 with ATCA
  30. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  31. GRB 081128: optical observation in CrAO
  32. GRB 081128: Optical afterglow observations
  33. GRB 081204: GROND Observations
  34. GRB 081204: Swift/UVOT Upper Limits
  35. GRB 081204: Swift XRT afterglow confirmation
  36. GRB 081204: Swift XRT afterglow candidate
  37. Swift-XRT observations of GRB 081203B
  38. Konus-Wind observation of GRB 081203A
  39. Konus-Wind observation of GRB 081203B
  40. GRB081203A: Swift-XRT refined analysis
  41. GRB 081203B: optical observations
  42. Swift/UVOT detection of GRB081203B
  43. GRB 081203B: Swift-XRT candidate afterglow.
  44. GRB 081203A: optical observations
  45. Swift UVOT observations of GRB 081203A
  46. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  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. GRB081203: optical observation
  52. GRB 081203: Swift detection of a burst with a bright optical counterpart
  53. GRB 081128: optical observation
  54. Swift Trigger 335971: Swift/UVOT Observations
  55. GRB 081126: Fermi GBM detection
  56. Swift Trigger 335971 is probably not a real source
  57. Trigger 335971: Swift possible detection of a burst
  58. GRB081128: Swift/UVOT Upper Limits
  59. GRB 081128: Swift-XRT refined analysis
  60. GRB081128: optical observations
  61. GRB 081128: Swift-BAT refined analysis
  62. GRB 081128: Enhanced Swift-XRT position
  63. GRB 081128: Swift detection of a burst
  64. GRB 081126: Swift observations continuing
  65. GRB081126: Afterglow photometry from Crni Vrh
  66. GRB 081126: GRT Optical Observation
  67. GRB 081127: Swift/UVOT Upper Limits
  68. GRB 081127: Swift-XRT refined analysis
  69. GRB 081127: Enhanced Swift-XRT position
  70. GRB 081126: Confirmation of the Optical Afterglow
  71. GRB 081127: Swift-BAT refined analysis
  72. GRB 081126: Swift-XRT refined analysis
  73. GRB 081127: Swift detection of a burst
  74. GRB 081126: Swift/UVOT Observations
  75. GRB 081126: optical observations
  76. GRB 081126: Swift-BAT refined analysis
  77. GRB 081126: Enhanced Swift-XRT position
  78. GRB 081126: TAROT Calern observatory optical observations
  79. GRB 081126: Swift detection of a burst
  80. Konus-Wind observation of GRB 081121
  81. GRB081121: Fermi GBM detection
  82. GRB081121: Refined Swift/UVOT observations
  83. GRB 081121: Swift-XRT refined analysis
  84. GRB 081121: Enhanced Swift-XRT position
  85. GRB 081121: GROND observations
  86. GRB 081121: Swift-BAT refined analysis
  87. GRB081121: Swift/UVOT observations
  88. GRB 081121: Swift detection of a burst
  89. GRB 081121: ROTSE-III Detection of Optical Counterpart
  90. GRB081118 : optical upper limit
  91. GRB 081118: Swift-XRT refined analysis
  92. GRB 081118: GROND detection of afterglow
  93. GRB 081118: Swift UVOT Upper Limits
  94. GRB 081118: Swift-BAT refined analysis
  95. GRB 081118: Enhanced Swift-XRT position
  96. GRB 081118: Swift detection of a burst
  97. GRB 081109A: confirmation of possible detection host galaxy
  98. Further Swift-XRT observations of the probable GRB 081105.
  99. GRB 081102: RTT150 Optical observations
  100. GRB 081109: TAROT La Silla observatory optical observations

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