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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"

36140 results found.

  1. GRB 081128: afterglow observations
  2. GRB 081203B: Suzaku WAM observation of the prompt emission
  3. GRB 081203B: Additional Gemini imaging
  4. Radio observation of GRB 081109 with ATCA
  5. Radio observation of GRB 081104 with ATCA
  6. Radio observation of GRB 081029 with ATCA
  7. Radio observation of GRB 081008 with ATCA
  8. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  9. GRB 081203B: Gemini observations
  10. GRB 081128: optical observation in CrAO
  11. GRB081203A: Optical observations at Ishigaki
  12. GRB 081128: Optical afterglow observations
  13. GRB 081204: GROND Observations
  14. GRB081203B: optical observations
  15. Radio detection of GRB 081203B with the VLA
  16. GRB 081204: Magellan observations
  17. GRB081203A: Radio upper limit at 15 GHz
  18. GRB 081204B: Fermi GBM detection
  19. GRB 081204: Swift/UVOT Upper Limits
  20. GRB 081204: Swift XRT afterglow confirmation
  21. GRB081203A: MITSuME optical observation
  22. GRB 081203A: Optical observations of Xinglong TNT telescope
  23. GRB 081203A: Skynet/GORT Detections
  24. GRB 081204: Swift XRT afterglow candidate
  25. GRB081203A: optical observation
  26. GRB 081204 : a long GRB localized by INTEGRAL
  27. VLA Radio upper limit on GRB 081203A
  28. Swift-XRT observations of GRB 081203B
  29. Konus-Wind observation of GRB 081203A
  30. Konus-Wind observation of GRB 081203B
  31. GRB081203A: Swift-XRT refined analysis
  32. GRB 081203B: optical observations
  33. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  34. Swift/UVOT detection of GRB081203B
  35. GRB 081203B: Swift-XRT candidate afterglow.
  36. GRB 081203A: optical observations
  37. Swift UVOT observations of GRB 081203A
  38. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  39. GRB081203A: Swift/UVOT grism redshift
  40. GRB 081203A: Burst detection from Swift-BAT slew data
  41. GRB 081203A: Swift-BAT refined analysis
  42. GRB 081203: Enhanced Swift-XRT position
  43. GRB 081130B: MASTER prompt optical observations
  44. GRB081203: optical observation
  45. GRB 081203: Swift detection of a burst with a bright optical counterpart
  46. GRB 081128: optical observation
  47. GRB 081130B: Fermi GBM detection
  48. GRB 081130: Fermi GBM detection
  49. GRB 081126: afterglow photometry
  50. GRB 081126: Fermi GBM detection
  51. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  52. VLA Radio upper limit on GRB 081126
  53. GRB 081129: Fermi GBM detection
  54. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  55. GRB 081128A: optical observations
  56. Trigger 335971: Swift possible detection of a burst
  57. GRB081128: Swift/UVOT Upper Limits
  58. GRB 081122B: Fermi GBM Detection
  59. GRB 081128: Swift-XRT refined analysis
  60. GRB 081128: Liverpool Telescope afterglow confirmation
  61. GRB081128: optical observations
  62. GRB 081128: Swift-BAT refined analysis
  63. GRB 081128: Enhanced Swift-XRT position
  64. GRB 081128: Optical observation of xinglong TNT
  65. GRB 081128: Swift detection of a burst
  66. GRB 081126: Swift observations continuing
  67. GRB081126: Afterglow photometry from Crni Vrh
  68. GRB 081126: GRT Optical Observation
  69. GRB 081127: Swift/UVOT Upper Limits
  70. GRB 081127: Swift-XRT refined analysis
  71. GRB 081127: Enhanced Swift-XRT position
  72. GRB 081126: Confirmation of the Optical Afterglow
  73. GRB 081127: Swift-BAT refined analysis
  74. Konus-Wind observation of GRB 081126
  75. GRB 081126: Swift-XRT refined analysis
  76. GRB 081127: Swift detection of a burst
  77. GRB 081126: Swift/UVOT Observations
  78. GRB 081126: optical observations
  79. GRB 081126: Swift-BAT refined analysis
  80. GRB 081126: Enhanced Swift-XRT position
  81. GRB 081126: TAROT Calern observatory optical observations
  82. GRB 081126: Swift detection of a burst
  83. GRB 081125: Fermi GBM detection
  84. GRB 081124: Fermi GBM detection
  85. GRB 081120: Fermi GBM detection
  86. GRB 081118: Fermi GBM detection.
  87. GRB 081122: Fermi GBM detection
  88. Konus-Wind observation of GRB 081121
  89. GRB 081121, SMARTS optical/IR afterglow observations
  90. GRB081121: Fermi GBM detection
  91. Fermi GBM detection of a weak source
  92. GRB081121: Refined Swift/UVOT observations
  93. GRB 081121: Swift-XRT refined analysis
  94. GRB 081121: Magellan Redshift
  95. GRB 081121: Enhanced Swift-XRT position
  96. GRB 081121: GROND observations
  97. GRB 081121: Swift-BAT refined analysis
  98. GRB 081121: Swift detection of a burst
  99. GRB 081121: ROTSE-III Detection of Optical Counterpart
  100. GRB 081016b, SMARTS optical/IR observations

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