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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"

38673 results found.

  1. GRB051008: Swift-BAT detection of a bright burst
  2. GRB 051006: P60 Observations
  3. GRB 051006: XRT refined analysis
  4. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  5. GRB 051006: optical observations at Sierra Nevada
  6. GRB051006: Refined analysis of the Swift-BAT burst
  7. GRB 051006: XRT position
  8. GRB051006: Swift detection of a burst
  9. GRB 050906, summary of radio observations
  10. Swift-BAT triggers 158261 and 158262 Retraction
  11. GRB051001: Swift UVOT Upper Limits
  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: AAT infra-red observations
  16. GRB 051001: Swift-BAT refined analysis
  17. GRB 051001: Swift Detection of a Burst
  18. GRB 051001: ROTSE-III Optical Limits
  19. GRB050908: optical observations
  20. GRB050922C: optical observation
  21. GRB050922B: optical limit
  22. GRB 050922C: further VLT observations
  23. GRB 050820A: NIR photometry at the TNG
  24. GRB050922C: UVES/VLT high resolution spectroscopy
  25. GRB050925: Swift/XRT limits
  26. GRB/SGR 050925: IR Observations
  27. GRB050922C - Swift UVOT preliminary analysis
  28. GRB 050922C: break in the lightcurve
  29. GRB 050925: WSRT Radio Observations
  30. GRB050925: Swift UVOT upper limits
  31. Refined analysis of the Swift-BAT soft short burst
  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. GRB050922B: Swift UVOT early upper limits.
  41. INT 2.5m limit for GRB050922B
  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. GRB050918: Possible Swift/XRT detected afterglow
  59. GRB050820B: analysis of the XMM-Newton observation
  60. GRB050916: Swift/UVOT Upper Limits
  61. GRB 050916: Swift-BAT refined analysis
  62. GRB 050918 - A long GRB detected by INTEGRAL
  63. GRB 050915a: Radio Observations
  64. Swift-BAT trigger 155764 is not a GRB
  65. Swift-BAT trigger 155764 is probably not a GRB
  66. Swift trigger 155764: bad XRT centroid
  67. Swift-BAT trigger 155535 is definitely not a GRB
  68. GRB050916 : Swift-XRT refined analysis
  69. GRB 050916: 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. GRB050915: Swift/UVOT upper limits
  78. GRB 050915: KAIT optical limit
  79. GRB 050915: IR Observations
  80. GRB 050915: Swift XRT refined analysis
  81. GRB 050915: Swift-BAT refined analysis
  82. GRB050915: P60 Optical Observations
  83. GRB050915, optical observations
  84. GRB050915: XRT position
  85. GRB 050915: ROTSE-III optical limits
  86. GRB 050915: Swift detection of a GRB
  87. GRB050911: Upper limit on X-ray afterglow
  88. Swift-BAT trigger 155072 ground analysis
  89. Swift-BAT trigger 155072 is probably not a GRB
  90. GRB050914: XRT position probably due to cosmic ray
  91. GRB 050911: LCO limits on a variable source
  92. GRB 050908: DEIMOS spectrum and further analysis
  93. Swift is in normal operation
  94. GRB050911: Swift UVOT followup observations
  95. GRB050911: Swift-XRT position
  96. GRB 050911: LCO observations
  97. GRB 050911: Swift-BAT refined analysis
  98. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  99. GRB050911: Swift-BAT detection of a long burst
  100. GRB050908: detection of Swift/UVOT optical counterpart

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