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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"

36194 results found.

  1. GRB051008: Radio Observation
  2. GRB 051008: Swift XRT position
  3. GRB 051008, optical observations
  4. GRB 051008: early Swift XRT analysis
  5. GRB 051008: Swift UVOT Candidate
  6. GRB 051006: P60 Observations
  7. grb test
  8. GRB 051006: XRT refined analysis
  9. GRB 051006: optical observations at Sierra Nevada
  10. GRB 051006: XRT position
  11. GRB 050906, summary of radio observations
  12. GRB 050925: Second Epoch WSRT Radio Observations
  13. GRB 051001: Swift XRT refined analysis
  14. GRB 051001, optical observations at Mt. John
  15. GRB 051001: I-band limit
  16. GRB 051001: AAT infra-red observations
  17. GRB 051001: Swift-BAT refined analysis
  18. GRB 051001: Swift Detection of a Burst
  19. GRB 051001: ROTSE-III Optical Limits
  20. GRB050908: optical observations
  21. GRB050922C: optical observation
  22. GRB050922B: optical limit
  23. GRB 050922C: further VLT observations
  24. GRB 050820A: NIR photometry at the TNG
  25. GRB050922C: UVES/VLT high resolution spectroscopy
  26. GRB050925: Swift/XRT limits
  27. GRB/SGR 050925: IR Observations
  28. GRB 050922C: break in the lightcurve
  29. GRB 050925: WSRT Radio Observations
  30. GRB 050925 : I-band observation at Xinglong observatory
  31. GRB050925: Faulkes Telescope North R-band limit
  32. GRB050925: Swift-BAT detection of a short burst
  33. GRB 050922B: Correction to BAT refined analysis, longer burst
  34. GRB050922C: TNG spectroscopic observations
  35. GRB050922B: refined XRT analysis
  36. Konus-Wind observation of GRB 050922C
  37. GRB 050922C: Refined redshift
  38. GRB OT observation
  39. GRB050922C: observation at MonteBoo
  40. INT 2.5m limit for GRB050922B
  41. GRB 050922B: optical limit
  42. GRB050922C: Optical Observations
  43. GRB 050922C: Swift XRT refined analysis
  44. HETE Fregate observations of GRB 050922C
  45. GRB 050922C: Swift-BAT refined analysis
  46. GRB 050922B: Swift-BAT refined analysis
  47. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  48. GRB 050922C: optical obserations
  49. GRB 050922C: NOT optical observations
  50. GRB 050922A: Analysis of Swift/XRT TOO observation
  51. GRB 050922C: Swift detection of a bright burst
  52. GRB 050922C: ROTSE-IIId Refined Analysis
  53. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  54. GRB 050922B: ROTSE-III Optical Limits
  55. GRB 050922B,optical observation
  56. GRB050922B: Swift-BAT detection of a weak long burst
  57. Possible GRB 050922 detected by INTEGRAL
  58. GRB050820B: analysis of the XMM-Newton observation
  59. GRB050916: Swift/UVOT Upper Limits
  60. GRB 050916: Swift-BAT refined analysis
  61. GRB 050918 - A long GRB detected by INTEGRAL
  62. GRB 050915a: Radio Observations
  63. Swift-BAT trigger 155764 is not a GRB
  64. Swift-BAT trigger 155764 is probably not a GRB
  65. Swift-BAT trigger 155535 is definitely not a GRB
  66. GRB 050916: XRT position
  67. GRB 050915b, SMARTS optical/IR observations of the XRT position
  68. GRB 050915B: Swift-BAT refined analysis
  69. GRB 050915B: Swift/UVOT Upper Limits
  70. GRB 050915a: IR Transient
  71. GRB 050915B: XRT position
  72. GRB 050915b, SMARTS optical/IR observations
  73. GRB 050915: KAIT optical limit
  74. GRB 050915: IR Observations
  75. GRB 050915: Swift XRT refined analysis
  76. GRB 050915: Swift-BAT refined analysis
  77. GRB050915: P60 Optical Observations
  78. GRB 050915: ROTSE-III optical limits
  79. GRB 050915: Swift detection of a GRB
  80. GRB050911: Upper limit on X-ray afterglow
  81. Swift-BAT trigger 155072 ground analysis
  82. Swift-BAT trigger 155072 is probably not a GRB
  83. GRB 050911: LCO limits on a variable source
  84. GRB 050908: DEIMOS spectrum and further analysis
  85. Swift is in normal operation
  86. GRB 050911, optical content of Swift/XRT error box
  87. GRB 050911: LCO observations
  88. GRB 050911, optical observations
  89. GRB 050911: Swift-BAT refined analysis
  90. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  91. GRB 050911: z~0.16 cluster in the field
  92. GRB 050910a: TAROT early optical limits
  93. RBO GRB 050908 observations
  94. WIRO observations in I of GRB 050908
  95. GRB 050906: Possible X-ray Counterpart
  96. GRB 050906: RTT150 optical observations
  97. GRB050908: VLT R-band decay index.
  98. GRB 050908: Swift-BAT refined analysis
  99. GRB 050908: Optical observations
  100. Gemini Spectroscopy of GRB 050908

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