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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"

28116 results found.

  1. IPN triangulation of bright GRB 081215A
  2. GRB 081222: Faulkes Telescope South observations
  3. GRB 081221: Gemini-N nIR imaging
  4. GRB081222, optical observation
  5. GRB081203A: BTA observation
  6. Konus-Wind observation of GRB 081221
  7. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  8. GRB081222: REM candidate afterglow
  9. GRB 081222: Swift detection of a burst with a bright optical afterglow
  10. GRB 081221: Enhanced Swift-XRT position
  11. GRB 081221: further NOT observations
  12. GRB 081221: NOT observations
  13. GRB 081221: Swift detection of a burst
  14. GRB 081217: Fermi GBM detection
  15. GRB 081211B: Further Swift-XRT analysis
  16. GRB 081215B: Fermi GBM detection
  17. GRB 081216: Suzaku WAM observation of the prompt emission
  18. GRB 081216 : Fermi GBM observation
  19. GRB 081215A: Fermi GBM detection
  20. GRB 081118: Zadko observations
  21. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  22. GRB 0811215A: MASTER prompt optical observations
  23. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  24. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  25. Possible GRB 081211B: Swift/UVOT Upper Limits
  26. GRB 081213: Fermi GBM detection
  27. Possible GRB 081211B - Swift-XRT analysis
  28. GRB 081207: Fermi GBM detection
  29. GRB 081209: Fermi GBM detection
  30. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  31. GRB 081210, SMARTS optical/IR observations
  32. GRB 081211: Swift-BAT refined analysis
  33. GRB 081211: Swift XRT refined analysis
  34. GRB 081211: Enhanced Swift-XRT position
  35. GRB 081211: Swift detection of a burst
  36. GRB 081210: Swift-XRT refined analysis
  37. GRB081203B: optical observations
  38. GRB 081210: Enhanced Swift-XRT position
  39. GRB 081210: Swift-BAT refined analysis
  40. GRB 081210: Swift detection of a burst with optical afterglow
  41. IPN triangulation of short hard GRB 081209
  42. GRB 081203A: optical observations
  43. GRB 081206C: Fermi GBM detection
  44. Radio observation of GRB 081121 with ATCA
  45. Radio observation of GRB 081118 with ATCA
  46. GRB 081206B: Fermi GBM detection
  47. GRB 081206: Fermi GBM detection
  48. GRB 081128: afterglow observations
  49. GRB 081203B: Suzaku WAM observation of the prompt emission
  50. Radio observation of GRB 081109 with ATCA
  51. Radio observation of GRB 081104 with ATCA
  52. Radio observation of GRB 081029 with ATCA
  53. Radio observation of GRB 081008 with ATCA
  54. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  55. GRB081203A: Optical observations at Ishigaki
  56. GRB 081204: GROND Observations
  57. Radio detection of GRB 081203B with the VLA
  58. GRB081203A: Radio upper limit at 15 GHz
  59. GRB 081204B: Fermi GBM detection
  60. GRB 081204: Swift/UVOT Upper Limits
  61. GRB 081204: Swift XRT afterglow confirmation
  62. GRB081203A: MITSuME optical observation
  63. GRB081203A: optical observation
  64. GRB 081204 : a long GRB localized by INTEGRAL
  65. VLA Radio upper limit on GRB 081203A
  66. Swift-XRT observations of GRB 081203B
  67. GRB081203A: Swift-XRT refined analysis
  68. GRB 081203B: optical observations
  69. Swift/UVOT detection of GRB081203B
  70. GRB 081203B: Swift-XRT candidate afterglow.
  71. GRB 081203A: optical observations
  72. GRB081203A: Swift/UVOT grism redshift
  73. GRB 081203A: Burst detection from Swift-BAT slew data
  74. GRB 081203A: Swift-BAT refined analysis
  75. GRB 081203: Enhanced Swift-XRT position
  76. GRB 081130B: MASTER prompt optical observations
  77. GRB081203: optical observation
  78. GRB 081203: Swift detection of a burst with a bright optical counterpart
  79. GRB 081130B: Fermi GBM detection
  80. GRB 081130: Fermi GBM detection
  81. Swift Trigger 335971: Swift/UVOT Observations
  82. GRB 081126: afterglow photometry
  83. GRB 081126: Fermi GBM detection
  84. VLA Radio upper limit on GRB 081126
  85. GRB 081129: Fermi GBM detection
  86. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  87. GRB 081128A: optical observations
  88. Trigger 335971: Swift possible detection of a burst
  89. GRB081128: Swift/UVOT Upper Limits
  90. GRB 081122B: Fermi GBM Detection
  91. GRB 081128: Swift-XRT refined analysis
  92. GRB 081128: Liverpool Telescope afterglow confirmation
  93. GRB081128: optical observations
  94. GRB 081128: Swift-BAT refined analysis
  95. GRB 081128: Enhanced Swift-XRT position
  96. GRB 081128: Optical observation of xinglong TNT
  97. GRB 081128: Swift detection of a burst
  98. GRB081126: Afterglow photometry from Crni Vrh
  99. GRB 081126: GRT Optical Observation
  100. GRB 081127: Swift/UVOT Upper Limits

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