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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"

41996 results found.

  1. GRB 050922C: Refined redshift
  2. GRB050922B: Swift UVOT early upper limits.
  3. GRB OT observation
  4. GRB050922C: observation at MonteBoo
  5. INT 2.5m limit for GRB050922B
  6. GRB 050922B: optical limit
  7. GRB050922C: Optical Observations
  8. GRB 050922C: Swift XRT refined analysis
  9. HETE Fregate observations of GRB 050922C
  10. GRB 050922C: Swift-BAT refined analysis
  11. GRB 050922B: Swift-BAT refined analysis
  12. GRB050922C: optical observations
  13. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  14. GRB 050922C: optical obserations
  15. GRB 050922C: NOT optical observations
  16. GRB 050922A: Analysis of Swift/XRT TOO observation
  17. GRB 050922C: Swift detection of a bright burst
  18. GRB 050922C: ROTSE-IIId Refined Analysis
  19. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  20. GRB 050922B: ROTSE-III Optical Limits
  21. GRB050922B: Swift-BAT detection of a weak long burst
  22. Possible GRB 050922 detected by INTEGRAL
  23. GRB050918: Possible Swift/XRT detected afterglow
  24. GRB050820B: analysis of the XMM-Newton observation
  25. GRB050916: Swift/UVOT Upper Limits
  26. GRB 050916: Swift-BAT refined analysis
  27. GRB 050918 - A long GRB detected by INTEGRAL
  28. GRB 050915a: Radio Observations
  29. Swift-BAT trigger 155764 is not a GRB
  30. Swift-BAT trigger 155764 is probably not a GRB
  31. Swift trigger 155764: bad XRT centroid
  32. Swift-BAT trigger 155535 is definitely not a GRB
  33. GRB050916 : Swift-XRT refined analysis
  34. GRB 050916: XRT position
  35. GRB 050915b, SMARTS optical/IR observations of the XRT position
  36. GRB 050915B: Swift-BAT refined analysis
  37. GRB 050915B: Swift/UVOT Upper Limits
  38. GRB050916: Swift-BAT detection of a long weak burst
  39. GRB 050915a: IR Transient
  40. GRB 050915B: XRT position
  41. GRB 050915b, SMARTS optical/IR observations
  42. GRB050915B: Swift-BAT detection of a long bright burst
  43. GRB050915: Swift/UVOT upper limits
  44. GRB 050915: KAIT optical limit
  45. GRB 050915: IR Observations
  46. GRB 050915: Swift XRT refined analysis
  47. GRB 050915: Swift-BAT refined analysis
  48. GRB050915: P60 Optical Observations
  49. GRB050915, optical observations
  50. GRB050915: XRT position
  51. GRB 050915: ROTSE-III optical limits
  52. GRB 050915: Swift detection of a GRB
  53. GRB050911: Upper limit on X-ray afterglow
  54. Swift-BAT trigger 155072 ground analysis
  55. Swift-BAT trigger 155072 is probably not a GRB
  56. GRB 050911: LCO limits on a variable source
  57. GRB 050908: DEIMOS spectrum and further analysis
  58. Swift is in normal operation
  59. GRB050911: Swift UVOT followup observations
  60. GRB 050911, optical content of Swift/XRT error box
  61. GRB050911: Swift-XRT position
  62. GRB 050911: LCO observations
  63. GRB 050911, optical observations
  64. GRB 050911: Swift-BAT refined analysis
  65. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  66. GRB 050911: z~0.16 cluster in the field
  67. GRB050908: detection of Swift/UVOT optical counterpart
  68. GRB 050910a: TAROT early optical limits
  69. RBO GRB 050908 observations
  70. WIRO observations in I of GRB 050908
  71. GRB 050906: Possible X-ray Counterpart
  72. GRB 050906: RTT150 optical observations
  73. GRB050908: Swift/UVOT Early upper limits
  74. GRB050908: VLT R-band decay index.
  75. GRB050908 : Swift-XRT refined analysis
  76. GRB 050908: Swift-BAT refined analysis
  77. GRB 050908: Optical observations
  78. Gemini Spectroscopy of GRB 050908
  79. GRB 050908: spectroscopic redshift
  80. GRB 050908: Prompt PROMPT Observations
  81. GRB 050908 : Swift XRT position
  82. GRB 050908: KAIT observations
  83. GRB 050908: P60 Confirmation of Optical Afterglow
  84. GRB 050908: Optical Observations
  85. GRB 050908: Swift detection of a burst
  86. GRB 050906: Optical observations at the Very Large Telescope
  87. GRB050904: CrAO optical observations
  88. GRB 050904 BAT refined analysis of complete data set
  89. GRB 050904: Subaru Optical Spectroscopy
  90. GRB 050906: MARGE Optical Limits
  91. GRB 050906: Swift-BAT refined analysis
  92. GRB 050906: Swift XRT upper limit
  93. GRB 050906: Radio Observations
  94. GRB 050904: Keck I-band Imaging
  95. GRB050906: P60 Observations
  96. GRB 050904: more VLT NIR observations
  97. GRB 050904: BOOTES early R-band observation
  98. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  99. GRB 050906: Bright galaxy in BAT error box
  100. GRB 050906: Swift/BAT Detection of a possible burst

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