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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"

36096 results found.

  1. IBAS Alert 2673: not a real GRB
  2. GRB051011: MASTER optical observation
  3. GRB051008: optical observation
  4. GRB051008: Swift XRT refined analysis
  5. GRB051008 - Swift UVOT upper limits
  6. Konus-Wind observation of GRB 051008
  7. GRB051008: Final refined analysis of the Swift-BAT burst
  8. GRB 051008: R-band upper limit
  9. GRB051008: Radio Observation
  10. GRB 051008: Swift XRT position
  11. GRB 051008, optical observations
  12. GRB 051008: early Swift XRT analysis
  13. GRB 051008: Swift UVOT Candidate
  14. GRB 051006: P60 Observations
  15. grb test
  16. GRB 051006: XRT refined analysis
  17. GRB 051006: optical observations at Sierra Nevada
  18. GRB 051006: XRT position
  19. GRB 050906, summary of radio observations
  20. GRB 050925: Second Epoch WSRT Radio Observations
  21. GRB 051001: Swift XRT refined analysis
  22. GRB 051001, optical observations at Mt. John
  23. GRB 051001: I-band limit
  24. GRB 051001: AAT infra-red observations
  25. GRB 051001: Swift-BAT refined analysis
  26. GRB 051001: Swift Detection of a Burst
  27. GRB 051001: ROTSE-III Optical Limits
  28. GRB050908: optical observations
  29. GRB050922C: optical observation
  30. GRB050922B: optical limit
  31. GRB 050922C: further VLT observations
  32. GRB 050820A: NIR photometry at the TNG
  33. GRB050922C: UVES/VLT high resolution spectroscopy
  34. GRB050925: Swift/XRT limits
  35. GRB/SGR 050925: IR Observations
  36. GRB 050922C: break in the lightcurve
  37. GRB 050925: WSRT Radio Observations
  38. GRB 050925 : I-band observation at Xinglong observatory
  39. GRB050925: Faulkes Telescope North R-band limit
  40. GRB050925: Swift-BAT detection of a short burst
  41. GRB 050922B: Correction to BAT refined analysis, longer burst
  42. GRB050922C: TNG spectroscopic observations
  43. GRB050922B: refined XRT analysis
  44. Konus-Wind observation of GRB 050922C
  45. GRB 050922C: Refined redshift
  46. GRB OT observation
  47. GRB050922C: observation at MonteBoo
  48. INT 2.5m limit for GRB050922B
  49. GRB 050922B: optical limit
  50. GRB050922C: Optical Observations
  51. GRB 050922C: Swift XRT refined analysis
  52. HETE Fregate observations of GRB 050922C
  53. GRB 050922C: Swift-BAT refined analysis
  54. GRB 050922B: Swift-BAT refined analysis
  55. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  56. GRB 050922C: optical obserations
  57. GRB 050922C: NOT optical observations
  58. GRB 050922A: Analysis of Swift/XRT TOO observation
  59. GRB 050922C: Swift detection of a bright burst
  60. GRB 050922C: ROTSE-IIId Refined Analysis
  61. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  62. GRB 050922B: ROTSE-III Optical Limits
  63. GRB 050922B,optical observation
  64. GRB050922B: Swift-BAT detection of a weak long burst
  65. Possible GRB 050922 detected by INTEGRAL
  66. GRB050820B: analysis of the XMM-Newton observation
  67. GRB050916: Swift/UVOT Upper Limits
  68. GRB 050916: Swift-BAT refined analysis
  69. GRB 050918 - A long GRB detected by INTEGRAL
  70. GRB 050915a: Radio Observations
  71. Swift-BAT trigger 155764 is not a GRB
  72. Swift-BAT trigger 155764 is probably not a GRB
  73. Swift-BAT trigger 155535 is definitely not a GRB
  74. GRB 050916: XRT position
  75. GRB 050915b, SMARTS optical/IR observations of the XRT position
  76. GRB 050915B: Swift-BAT refined analysis
  77. GRB 050915B: Swift/UVOT Upper Limits
  78. GRB 050915a: IR Transient
  79. GRB 050915B: XRT position
  80. GRB 050915b, SMARTS optical/IR observations
  81. GRB 050915: KAIT optical limit
  82. GRB 050915: IR Observations
  83. GRB 050915: Swift XRT refined analysis
  84. GRB 050915: Swift-BAT refined analysis
  85. GRB050915: P60 Optical Observations
  86. GRB 050915: ROTSE-III optical limits
  87. GRB 050915: Swift detection of a GRB
  88. GRB050911: Upper limit on X-ray afterglow
  89. Swift-BAT trigger 155072 ground analysis
  90. Swift-BAT trigger 155072 is probably not a GRB
  91. GRB 050911: LCO limits on a variable source
  92. GRB 050908: DEIMOS spectrum and further analysis
  93. Swift is in normal operation
  94. GRB 050911, optical content of Swift/XRT error box
  95. GRB 050911: LCO observations
  96. GRB 050911, optical observations
  97. GRB 050911: Swift-BAT refined analysis
  98. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  99. GRB 050911: z~0.16 cluster in the field
  100. GRB 050910a: TAROT early optical limits

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