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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"

29122 results found.

  1. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  2. GRB 081222: Swift detection of a burst with a bright optical afterglow
  3. GRB 081221: Swift detection of a burst
  4. GRB 081217: Fermi GBM detection
  5. Modification of Swift/UVOT response to bright GRBs
  6. GRB081215A: Fermi-LAT observations
  7. GRB 081215B: Fermi GBM detection
  8. GRB 081216: Suzaku WAM observation of the prompt emission
  9. GRB 081216 : Fermi GBM observation
  10. GRB 081215A: Fermi GBM detection (correction to event fluence)
  11. GRB 081215A: Fermi GBM detection
  12. IPN localization of short hard GRB 081216
  13. GRB 081118: Zadko observations
  14. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  15. GRB 0811215A: MASTER prompt optical observations
  16. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  17. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  18. GRB 081213: Fermi GBM detection
  19. GRB 081207: Fermi GBM detection
  20. GRB 081209: Fermi GBM detection
  21. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  22. GRB 081211: Swift-BAT refined analysis
  23. GRB 081211: Swift XRT refined analysis
  24. GRB 081211: Swift/UVOT detection of an optical afterglow
  25. GRB 081210: Swift/UVOT refined analysis
  26. GRB 081211: Swift detection of a burst
  27. GRB 081210: Swift-XRT refined analysis
  28. GRB 081210: Swift-BAT refined analysis
  29. GRB 081210: Swift detection of a burst with optical afterglow
  30. Konus-Wind observation of GRB 081209
  31. IPN triangulation of short hard GRB 081209
  32. GRB 081206C: Fermi GBM detection
  33. GRB 081206B: Fermi GBM detection
  34. GRB 081206: Fermi GBM detection
  35. GRB081203A: Optical observations at Ishigaki
  36. GRB 081204: GROND Observations
  37. GRB 081204B: Fermi GBM detection
  38. GRB 081204: Swift XRT afterglow confirmation
  39. GRB081203A: MITSuME optical observation
  40. GRB 081203A: Skynet/GORT Detections
  41. GRB 081204: Swift XRT afterglow candidate
  42. Konus-Wind observation of GRB 081203A
  43. GRB081203A: Swift-XRT refined analysis
  44. Swift/UVOT detection of GRB081203B
  45. GRB 081203B: Swift-XRT candidate afterglow.
  46. Swift UVOT observations of GRB 081203A
  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 081130B: MASTER prompt optical observations
  51. GRB 081203: Swift detection of a burst with a bright optical counterpart
  52. GRB 081130B: Fermi GBM detection
  53. GRB 081130: Fermi GBM detection
  54. Swift Trigger 335971: Swift/UVOT Observations
  55. GRB 081126: Fermi GBM detection
  56. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  57. GRB 081129: Fermi GBM detection
  58. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  59. Swift Trigger 335971 is probably not a real source
  60. Trigger 335971: Swift possible detection of a burst
  61. GRB081128: Swift/UVOT Upper Limits
  62. SGR 1806-20: Fermi GBM detection.
  63. GRB 081122B: Fermi GBM Detection
  64. GRB 081128: Swift-XRT refined analysis
  65. GRB 081128: Swift-BAT refined analysis
  66. GRB 081128: Swift detection of a burst
  67. GRB 081126: GRT Optical Observation
  68. GRB 081127: Swift/UVOT Upper Limits
  69. GRB 081127: Swift-BAT refined analysis
  70. GRB 081126: Swift-XRT refined analysis
  71. GRB 081127: Swift detection of a burst
  72. GRB 081126: Swift/UVOT Observations
  73. GRB 081126: optical observations
  74. GRB 081126: Swift-BAT refined analysis
  75. GRB 081126: TAROT Calern observatory optical observations
  76. GRB 081126: Swift detection of a burst
  77. GRB 081125: Fermi GBM detection
  78. GRB 081124: Fermi GBM detection
  79. GRB 081120: Fermi GBM detection
  80. GRB 081118: Fermi GBM detection.
  81. GRB 081122: Fermi GBM detection
  82. Konus-Wind observation of GRB 081121
  83. GRB081121: Fermi GBM detection
  84. Fermi GBM detection of a weak source
  85. GRB081121: Refined Swift/UVOT observations
  86. GRB 081121: Swift-XRT refined analysis
  87. GRB 081121: GROND observations
  88. GRB 081121: Swift-BAT refined analysis
  89. GRB081121: Swift/UVOT observations
  90. GRB 081121: Swift detection of a burst
  91. GRB 081121: ROTSE-III Detection of Optical Counterpart
  92. GRB081118 : optical upper limit
  93. GRB 081119: Fermi GBM detection
  94. GRB 081118: Swift-XRT refined analysis
  95. GRB 081118: GROND detection of afterglow
  96. GRB 081118: Swift UVOT Upper Limits
  97. GRB 081118: Swift-BAT refined analysis
  98. GRB 081118: Swift detection of a burst
  99. Further Swift-XRT observations of the probable GRB 081105.
  100. GRB 081113: Fermi GBM detection

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