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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"

18364 results found.

  1. GRB 081226: ROTSE-III Optical Limits
  2. GRB 081226: Swift detection of a possible short-hard burst
  3. GRB 080810: optical observations
  4. GRB 081211B: optical observations
  5. GRB 081224: Swift-XRT observation
  6. GRB 081222: MITSuME optical observation
  7. GRB 081221: GROND observations
  8. GRB 081222:Optical afterglow observation
  9. VLA radio upper limit on GRB 081222
  10. GRB 081222: Fermi GBM observation
  11. GRB 081221: Probable host galaxy in Keck imaging
  12. GRB 081222, Swift-BAT refined analysis
  13. GRB081222 optical limit by "Pi of the Sky"
  14. GRB 081222: Swift XRT refined analysis
  15. GRB081221: Fermi GBM observation
  16. IPN triangulation of bright GRB 081215A
  17. GRB 081221: Swift-XRT Refined Analysis
  18. GRB 081222: Faulkes Telescope South observations
  19. GRB 081221: Gemini-N nIR imaging
  20. GRB081222, optical observation
  21. GRB081203A: BTA observation
  22. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  23. GRB081222: REM candidate afterglow
  24. GRB 081222: Swift detection of a burst with a bright optical afterglow
  25. GRB 081221: Enhanced Swift-XRT position
  26. GRB 081221: further NOT observations
  27. GRB 081221: NOT observations
  28. GRB 081221: Swift detection of a burst
  29. GRB 081118: Zadko observations
  30. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  31. GRB 0811215A: MASTER prompt optical observations
  32. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  33. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  34. Possible GRB 081211B: Swift/UVOT Upper Limits
  35. Possible GRB 081211B - Swift-XRT analysis
  36. GRB 081209: Fermi GBM detection
  37. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  38. GRB 081210, SMARTS optical/IR observations
  39. GRB 081211: Enhanced Swift-XRT position
  40. GRB 081211: Swift detection of a burst
  41. GRB081203B: optical observations
  42. GRB 081210: Enhanced Swift-XRT position
  43. GRB 081210: Swift detection of a burst with optical afterglow
  44. IPN triangulation of short hard GRB 081209
  45. GRB 081203A: optical observations
  46. GRB 081128: afterglow observations
  47. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  48. GRB081203A: Optical observations at Ishigaki
  49. GRB 081204: GROND Observations
  50. Radio detection of GRB 081203B with the VLA
  51. GRB081203A: Radio upper limit at 15 GHz
  52. GRB 081204: Swift/UVOT Upper Limits
  53. GRB081203A: MITSuME optical observation
  54. GRB081203A: optical observation
  55. VLA Radio upper limit on GRB 081203A
  56. GRB 081203B: optical observations
  57. Swift/UVOT detection of GRB081203B
  58. GRB 081203B: Swift-XRT candidate afterglow.
  59. GRB 081203A: optical observations
  60. GRB 081203: Enhanced Swift-XRT position
  61. GRB 081130B: MASTER prompt optical observations
  62. GRB081203: optical observation
  63. GRB 081203: Swift detection of a burst with a bright optical counterpart
  64. Swift Trigger 335971: Swift/UVOT Observations
  65. GRB 081126: afterglow photometry
  66. VLA Radio upper limit on GRB 081126
  67. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  68. GRB 081128A: optical observations
  69. Trigger 335971: Swift possible detection of a burst
  70. GRB081128: Swift/UVOT Upper Limits
  71. GRB 081128: Liverpool Telescope afterglow confirmation
  72. GRB081128: optical observations
  73. GRB 081128: Enhanced Swift-XRT position
  74. GRB 081128: Optical observation of xinglong TNT
  75. GRB 081128: Swift detection of a burst
  76. GRB 081126: GRT Optical Observation
  77. GRB 081127: Swift/UVOT Upper Limits
  78. GRB 081127: Enhanced Swift-XRT position
  79. GRB 081127: Swift detection of a burst
  80. GRB 081126: Swift/UVOT Observations
  81. GRB 081126: optical observations
  82. GRB 081126: Enhanced Swift-XRT position
  83. GRB 081126: TAROT Calern observatory optical observations
  84. GRB 081126: Swift detection of a burst
  85. GRB 081121, SMARTS optical/IR afterglow observations
  86. GRB081121: Refined Swift/UVOT observations
  87. GRB 081121: Swift-XRT refined analysis
  88. GRB 081121: Enhanced Swift-XRT position
  89. GRB 081121: GROND observations
  90. GRB081121: Swift/UVOT observations
  91. GRB081118 : optical upper limit
  92. VLA Radio upper limit on GRB 081118
  93. GRB 081118: Swift-XRT refined analysis
  94. GRB 081118: GROND detection of afterglow
  95. GRB 081118: optical afterglow candidate
  96. GRB 081118: Swift UVOT Upper Limits
  97. GRB 081118: Enhanced Swift-XRT position
  98. GRB 081118: Swift detection of a burst
  99. GRB 081109A: confirmation of possible detection host galaxy
  100. Further Swift-XRT observations of the probable GRB 081105.

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