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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"

39371 results found.

  1. GRB 051008: Swift XRT position
  2. GRB 051008, optical observations
  3. GRB 051008: early Swift XRT analysis
  4. GRB 051008: Swift UVOT Candidate
  5. GRB051008: Swift-BAT detection of a bright burst
  6. GRB 051006: P60 Observations
  7. grb test
  8. GRB 051006: XRT refined analysis
  9. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  10. GRB 051006: optical observations at Sierra Nevada
  11. GRB 051006: XRT position
  12. GRB051006: Swift detection of a burst
  13. GRB 050906, summary of radio observations
  14. GRB 050925: Second Epoch WSRT Radio Observations
  15. GRB 051001: Swift XRT refined analysis
  16. GRB 051001, optical observations at Mt. John
  17. GRB 051001: I-band limit
  18. GRB 051001: AAT infra-red observations
  19. GRB 051001: Swift-BAT refined analysis
  20. GRB 051001: Swift Detection of a Burst
  21. GRB 051001: ROTSE-III Optical Limits
  22. GRB050908: optical observations
  23. GRB050922C: optical observation
  24. GRB050922B: optical limit
  25. GRB 050922C: further VLT observations
  26. GRB 050820A: NIR photometry at the TNG
  27. GRB050922C: UVES/VLT high resolution spectroscopy
  28. GRB050925: Swift/XRT limits
  29. GRB/SGR 050925: IR Observations
  30. GRB 050922C: break in the lightcurve
  31. GRB 050925: WSRT Radio Observations
  32. GRB 050925 : I-band observation at Xinglong observatory
  33. GRB050925: Faulkes Telescope North R-band limit
  34. GRB050925: Swift-BAT detection of a short burst
  35. GRB 050922B: Correction to BAT refined analysis, longer burst
  36. GRB050922C: TNG spectroscopic observations
  37. GRB050922B: refined XRT analysis
  38. Konus-Wind observation of GRB 050922C
  39. GRB 050922C: Refined redshift
  40. GRB OT observation
  41. GRB050922C: observation at MonteBoo
  42. INT 2.5m limit for GRB050922B
  43. GRB 050922B: optical limit
  44. GRB050922C: Optical Observations
  45. GRB 050922C: Swift XRT refined analysis
  46. HETE Fregate observations of GRB 050922C
  47. GRB 050922C: Swift-BAT refined analysis
  48. GRB 050922B: Swift-BAT refined analysis
  49. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  50. GRB 050922C: optical obserations
  51. GRB 050922C: NOT optical observations
  52. GRB 050922A: Analysis of Swift/XRT TOO observation
  53. GRB 050922C: Swift detection of a bright burst
  54. GRB 050922C: ROTSE-IIId Refined Analysis
  55. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  56. GRB 050922B: ROTSE-III Optical Limits
  57. GRB 050922B,optical observation
  58. GRB050922B: Swift-BAT detection of a weak long burst
  59. Possible GRB 050922 detected by INTEGRAL
  60. GRB050820B: analysis of the XMM-Newton observation
  61. GRB050916: Swift/UVOT Upper Limits
  62. GRB 050916: Swift-BAT refined analysis
  63. GRB 050918 - A long GRB detected by INTEGRAL
  64. GRB 050915a: Radio Observations
  65. Swift-BAT trigger 155764 is not a GRB
  66. Swift-BAT trigger 155764 is probably not a GRB
  67. Swift-BAT trigger 155535 is definitely not a GRB
  68. GRB 050916: XRT position
  69. GRB 050915b, SMARTS optical/IR observations of the XRT position
  70. GRB 050915B: Swift-BAT refined analysis
  71. GRB 050915B: Swift/UVOT Upper Limits
  72. GRB050916: Swift-BAT detection of a long weak burst
  73. GRB 050915a: IR Transient
  74. GRB 050915B: XRT position
  75. GRB 050915b, SMARTS optical/IR observations
  76. GRB050915B: Swift-BAT detection of a long bright burst
  77. GRB 050915: KAIT optical limit
  78. GRB 050915: IR Observations
  79. GRB 050915: Swift XRT refined analysis
  80. GRB 050915: Swift-BAT refined analysis
  81. GRB050915: P60 Optical Observations
  82. GRB 050915: ROTSE-III optical limits
  83. GRB 050915: Swift detection of a GRB
  84. GRB050911: Upper limit on X-ray afterglow
  85. Swift-BAT trigger 155072 ground analysis
  86. Swift-BAT trigger 155072 is probably not a GRB
  87. GRB 050911: LCO limits on a variable source
  88. GRB 050908: DEIMOS spectrum and further analysis
  89. Swift is in normal operation
  90. GRB 050911, optical content of Swift/XRT error box
  91. GRB 050911: LCO observations
  92. GRB 050911, optical observations
  93. GRB 050911: Swift-BAT refined analysis
  94. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  95. GRB 050911: z~0.16 cluster in the field
  96. GRB050911: Swift-BAT detection of a long burst
  97. GRB 050910a: TAROT early optical limits
  98. RBO GRB 050908 observations
  99. WIRO observations in I of GRB 050908
  100. GRB 050906: Possible X-ray Counterpart

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