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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"

37767 results found.

  1. GRB050922B: optical limit
  2. GRB 050922C: further VLT observations
  3. GRB 050820A: NIR photometry at the TNG
  4. GRB050922C: UVES/VLT high resolution spectroscopy
  5. GRB050925: Swift/XRT limits
  6. GRB/SGR 050925: IR Observations
  7. GRB 050922C: break in the lightcurve
  8. GRB 050925: WSRT Radio Observations
  9. GRB 050925 : I-band observation at Xinglong observatory
  10. GRB050925: Faulkes Telescope North R-band limit
  11. GRB050925: Swift-BAT detection of a short burst
  12. GRB 050922B: Correction to BAT refined analysis, longer burst
  13. GRB050922C: TNG spectroscopic observations
  14. GRB050922B: refined XRT analysis
  15. Konus-Wind observation of GRB 050922C
  16. GRB 050922C: Refined redshift
  17. GRB OT observation
  18. GRB050922C: observation at MonteBoo
  19. INT 2.5m limit for GRB050922B
  20. GRB 050922B: optical limit
  21. GRB050922C: Optical Observations
  22. GRB 050922C: Swift XRT refined analysis
  23. HETE Fregate observations of GRB 050922C
  24. GRB 050922C: Swift-BAT refined analysis
  25. GRB 050922B: Swift-BAT refined analysis
  26. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  27. GRB 050922C: optical obserations
  28. GRB 050922C: NOT optical observations
  29. GRB 050922A: Analysis of Swift/XRT TOO observation
  30. GRB 050922C: Swift detection of a bright burst
  31. GRB 050922C: ROTSE-IIId Refined Analysis
  32. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  33. GRB 050922B: ROTSE-III Optical Limits
  34. GRB 050922B,optical observation
  35. GRB050922B: Swift-BAT detection of a weak long burst
  36. Possible GRB 050922 detected by INTEGRAL
  37. GRB050820B: analysis of the XMM-Newton observation
  38. GRB050916: Swift/UVOT Upper Limits
  39. GRB 050916: Swift-BAT refined analysis
  40. GRB 050918 - A long GRB detected by INTEGRAL
  41. GRB 050915a: Radio Observations
  42. Swift-BAT trigger 155764 is not a GRB
  43. Swift-BAT trigger 155764 is probably not a GRB
  44. Swift-BAT trigger 155535 is definitely not a GRB
  45. GRB 050916: XRT position
  46. GRB 050915b, SMARTS optical/IR observations of the XRT position
  47. GRB 050915B: Swift-BAT refined analysis
  48. GRB 050915B: Swift/UVOT Upper Limits
  49. GRB 050915a: IR Transient
  50. GRB 050915B: XRT position
  51. GRB 050915b, SMARTS optical/IR observations
  52. GRB 050915: KAIT optical limit
  53. GRB 050915: IR Observations
  54. GRB 050915: Swift XRT refined analysis
  55. GRB 050915: Swift-BAT refined analysis
  56. GRB050915: P60 Optical Observations
  57. GRB 050915: ROTSE-III optical limits
  58. GRB 050915: Swift detection of a GRB
  59. GRB050911: Upper limit on X-ray afterglow
  60. Swift-BAT trigger 155072 ground analysis
  61. Swift-BAT trigger 155072 is probably not a GRB
  62. GRB 050911: LCO limits on a variable source
  63. GRB 050908: DEIMOS spectrum and further analysis
  64. Swift is in normal operation
  65. GRB 050911, optical content of Swift/XRT error box
  66. GRB 050911: LCO observations
  67. GRB 050911, optical observations
  68. GRB 050911: Swift-BAT refined analysis
  69. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  70. GRB 050911: z~0.16 cluster in the field
  71. GRB 050910a: TAROT early optical limits
  72. RBO GRB 050908 observations
  73. WIRO observations in I of GRB 050908
  74. GRB 050906: Possible X-ray Counterpart
  75. GRB 050906: RTT150 optical observations
  76. GRB050908: VLT R-band decay index.
  77. GRB 050908: Swift-BAT refined analysis
  78. GRB 050908: Optical observations
  79. Gemini Spectroscopy of GRB 050908
  80. GRB 050908: spectroscopic redshift
  81. GRB 050908: Prompt PROMPT Observations
  82. GRB 050908 : Swift XRT position
  83. GRB 050908: KAIT observations
  84. GRB 050908: P60 Confirmation of Optical Afterglow
  85. GRB 050908: Optical Observations
  86. GRB 050908: Swift detection of a burst
  87. Swift trigger 154073 is not a GRB
  88. GRB 050906: Optical observations at the Very Large Telescope
  89. GRB050904: CrAO optical observations
  90. GRB 050904 BAT refined analysis of complete data set
  91. GRB 050904: Subaru Optical Spectroscopy
  92. GRB 050906: MARGE Optical Limits
  93. GRB 050906: Swift-BAT refined analysis
  94. GRB 050906: Swift XRT upper limit
  95. GRB 050906: Radio Observations
  96. GRB 050904: Keck I-band Imaging
  97. GRB 050904: more VLT NIR observations
  98. GRB 050904: BOOTES early R-band observation
  99. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  100. GRB 050906: Bright galaxy in BAT error box

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