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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"

19607 results found.

  1. GRB 051006: Swift/UVOT Upper Limits
  2. GRB 051008 - a low redshift low-luminosity burst?
  3. GRB051008: Swift XRT refined analysis
  4. GRB051008 - Swift UVOT upper limits
  5. Konus-Wind observation of GRB 051008
  6. GRB051008: Final refined analysis of the Swift-BAT burst
  7. GRB 051008: R-band upper limit
  8. GRB051008: Refined analysis of the Swift-BAT burst
  9. GRB 051008: Swift XRT position
  10. GRB 051008: early Swift XRT analysis
  11. GRB 051008: Swift UVOT Candidate
  12. GRB051008: Swift-BAT detection of a bright burst
  13. GRB 051006: XRT refined analysis
  14. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  15. GRB 051006: optical observations at Sierra Nevada
  16. GRB051006: Refined analysis of the Swift-BAT burst
  17. GRB 051006: XRT position
  18. GRB051006: Swift detection of a burst
  19. Swift-BAT triggers 158261 and 158262 Retraction
  20. GRB051001: Swift UVOT Upper Limits
  21. GRB 050925: Second Epoch WSRT Radio Observations
  22. GRB 051001: Swift XRT refined analysis
  23. GRB 051001, optical observations at Mt. John
  24. GRB 051001: I-band limit
  25. GRB 051001: Swift-BAT refined analysis
  26. GRB 051001: Swift Detection of a Burst
  27. GRB 051001: ROTSE-III Optical Limits
  28. GRB050922B: optical limit
  29. GRB050925: Swift/XRT limits
  30. GRB/SGR 050925: IR Observations
  31. GRB050922C - Swift UVOT preliminary analysis
  32. GRB 050925: WSRT Radio Observations
  33. GRB050925: Swift UVOT upper limits
  34. Refined analysis of the Swift-BAT soft short burst
  35. GRB050925: Faulkes Telescope North R-band limit
  36. GRB050925: Swift-BAT detection of a short burst
  37. GRB 050922B: Correction to BAT refined analysis, longer burst
  38. GRB050922B: refined XRT analysis
  39. Konus-Wind observation of GRB 050922C
  40. GRB050922B: Swift UVOT early upper limits.
  41. GRB 050922B: optical limit
  42. GRB 050922C: Swift XRT refined analysis
  43. HETE Fregate observations of GRB 050922C
  44. GRB 050922C: Swift-BAT refined analysis
  45. GRB 050922B: Swift-BAT refined analysis
  46. GRB050922C: optical observations
  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. GRB050918: Possible Swift/XRT detected afterglow
  58. GRB050820B: analysis of the XMM-Newton observation
  59. GRB050916: Swift/UVOT Upper Limits
  60. GRB 050916: Swift-BAT refined analysis
  61. Swift-BAT trigger 155764 is not a GRB
  62. Swift-BAT trigger 155764 is probably not a GRB
  63. Swift trigger 155764: bad XRT centroid
  64. Swift-BAT trigger 155535 is definitely not a GRB
  65. GRB050916 : Swift-XRT refined analysis
  66. GRB 050916: XRT position
  67. GRB 050915B: Swift-BAT refined analysis
  68. GRB 050915B: Swift/UVOT Upper Limits
  69. GRB050916: Swift-BAT detection of a long weak burst
  70. GRB 050915B: XRT position
  71. GRB050915B: Swift-BAT detection of a long bright burst
  72. GRB050915: Swift/UVOT upper limits
  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, optical observations
  78. GRB050915: XRT position
  79. GRB 050915: ROTSE-III optical limits
  80. GRB 050915: Swift detection of a GRB
  81. GRB050911: Upper limit on X-ray afterglow
  82. Swift-BAT trigger 155072 ground analysis
  83. Swift-BAT trigger 155072 is probably not a GRB
  84. GRB050914: XRT position probably due to cosmic ray
  85. Swift is in normal operation
  86. GRB050911: Swift UVOT followup observations
  87. GRB 050911, optical content of Swift/XRT error box
  88. GRB050911: Swift-XRT position
  89. GRB 050911, optical observations
  90. GRB 050911: Swift-BAT refined analysis
  91. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  92. GRB050911: Swift-BAT detection of a long burst
  93. GRB050908: detection of Swift/UVOT optical counterpart
  94. RBO GRB 050908 observations
  95. WIRO observations in I of GRB 050908
  96. GRB 050906: Possible X-ray Counterpart
  97. GRB050908: Swift/UVOT Early upper limits
  98. GRB050908 : Swift-XRT refined analysis
  99. GRB 050908: Swift-BAT refined analysis
  100. GRB 050908: Optical observations

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