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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"

38125 results found.

  1. GRB 081204: Magellan observations
  2. GRB081203A: Radio upper limit at 15 GHz
  3. GRB 081204B: Fermi GBM detection
  4. GRB 081204: Swift/UVOT Upper Limits
  5. GRB 081204: Swift XRT afterglow confirmation
  6. GRB081203A: MITSuME optical observation
  7. GRB 081203A: Optical observations of Xinglong TNT telescope
  8. GRB 081203A: Skynet/GORT Detections
  9. GRB 081204: Swift XRT afterglow candidate
  10. GRB081203A: optical observation
  11. GRB 081204 : a long GRB localized by INTEGRAL
  12. VLA Radio upper limit on GRB 081203A
  13. Swift-XRT observations of GRB 081203B
  14. Konus-Wind observation of GRB 081203A
  15. Konus-Wind observation of GRB 081203B
  16. GRB081203A: Swift-XRT refined analysis
  17. GRB 081203B: optical observations
  18. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  19. Swift/UVOT detection of GRB081203B
  20. GRB 081203B: Swift-XRT candidate afterglow.
  21. GRB 081203A: optical observations
  22. Swift UVOT observations of GRB 081203A
  23. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  24. GRB081203A: Swift/UVOT grism redshift
  25. GRB 081203A: Burst detection from Swift-BAT slew data
  26. GRB 081203A: Swift-BAT refined analysis
  27. GRB 081203: Enhanced Swift-XRT position
  28. GRB 081130B: MASTER prompt optical observations
  29. GRB081203: optical observation
  30. GRB 081203: Swift detection of a burst with a bright optical counterpart
  31. GRB 081128: optical observation
  32. GRB 081130B: Fermi GBM detection
  33. GRB 081130: Fermi GBM detection
  34. GRB 081126: afterglow photometry
  35. GRB 081126: Fermi GBM detection
  36. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  37. VLA Radio upper limit on GRB 081126
  38. GRB 081129: Fermi GBM detection
  39. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  40. GRB 081128A: optical observations
  41. Trigger 335971: Swift possible detection of a burst
  42. GRB081128: Swift/UVOT Upper Limits
  43. GRB 081122B: Fermi GBM Detection
  44. GRB 081128: Swift-XRT refined analysis
  45. GRB 081128: Liverpool Telescope afterglow confirmation
  46. GRB081128: optical observations
  47. GRB 081128: Swift-BAT refined analysis
  48. GRB 081128: Enhanced Swift-XRT position
  49. GRB 081128: Optical observation of xinglong TNT
  50. GRB 081128: Swift detection of a burst
  51. GRB 081126: Swift observations continuing
  52. GRB081126: Afterglow photometry from Crni Vrh
  53. GRB 081126: GRT Optical Observation
  54. GRB 081127: Swift/UVOT Upper Limits
  55. GRB 081127: Swift-XRT refined analysis
  56. GRB 081127: Enhanced Swift-XRT position
  57. GRB 081126: Confirmation of the Optical Afterglow
  58. GRB 081127: Swift-BAT refined analysis
  59. Konus-Wind observation of GRB 081126
  60. GRB 081126: Swift-XRT refined analysis
  61. GRB 081127: Swift detection of a burst
  62. GRB 081126: Swift/UVOT Observations
  63. GRB 081126: optical observations
  64. GRB 081126: Swift-BAT refined analysis
  65. GRB 081126: Enhanced Swift-XRT position
  66. GRB 081126: TAROT Calern observatory optical observations
  67. GRB 081126: Swift detection of a burst
  68. GRB 081125: Fermi GBM detection
  69. GRB 081124: Fermi GBM detection
  70. GRB 081120: Fermi GBM detection
  71. GRB 081118: Fermi GBM detection.
  72. GRB 081122: Fermi GBM detection
  73. Konus-Wind observation of GRB 081121
  74. GRB 081121, SMARTS optical/IR afterglow observations
  75. GRB081121: Fermi GBM detection
  76. Fermi GBM detection of a weak source
  77. GRB081121: Refined Swift/UVOT observations
  78. GRB 081121: Swift-XRT refined analysis
  79. GRB 081121: Magellan Redshift
  80. GRB 081121: Enhanced Swift-XRT position
  81. GRB 081121: GROND observations
  82. GRB 081121: Swift-BAT refined analysis
  83. GRB 081121: Swift detection of a burst
  84. GRB 081121: ROTSE-III Detection of Optical Counterpart
  85. GRB 081016b, SMARTS optical/IR observations
  86. GRB 081119: Fermi GBM detection
  87. VLA Radio upper limit on GRB 081118
  88. GRB 081118: VLT redshift
  89. GRB 081118: Swift-XRT refined analysis
  90. GRB 081118: GROND detection of afterglow
  91. GRB 081118: optical afterglow candidate
  92. GRB 081118: Swift UVOT Upper Limits
  93. GRB 081118: Swift-BAT refined analysis
  94. GRB 081118: Enhanced Swift-XRT position
  95. GRB 081118: Swift detection of a burst
  96. GRB 081109A: confirmation of possible detection host galaxy
  97. Further Swift-XRT observations of the probable GRB 081105.
  98. GRB 081113: Fermi GBM detection
  99. GRB 081102: RTT150 Optical observations
  100. GRB 081110: Fermi GBM detection

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