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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"

43004 results found.

  1. GRB 050922C: break in the lightcurve
  2. GRB050925: Swift UVOT upper limits
  3. Refined analysis of the Swift-BAT soft short burst
  4. GRB050925: Faulkes Telescope North R-band limit
  5. GRB050925: Swift-BAT detection of a short burst
  6. GRB 050922B: Correction to BAT refined analysis, longer burst
  7. GRB050922C: TNG spectroscopic observations
  8. GRB050922B: refined XRT analysis
  9. Konus-Wind observation of GRB 050922C
  10. GRB 050922C: Refined redshift
  11. GRB050922B: Swift UVOT early upper limits.
  12. GRB050922C: observation at MonteBoo
  13. INT 2.5m limit for GRB050922B
  14. GRB 050922B: optical limit
  15. GRB050922C: Optical Observations
  16. GRB 050922C: Swift XRT refined analysis
  17. HETE Fregate observations of GRB 050922C
  18. GRB 050922B: Swift-BAT refined analysis
  19. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  20. GRB 050922C: optical obserations
  21. GRB 050922C: NOT optical observations
  22. GRB 050922A: Analysis of Swift/XRT TOO observation
  23. GRB 050922C: Swift detection of a bright burst
  24. GRB 050922B: ROTSE-III Optical Limits
  25. GRB050922B: Swift-BAT detection of a weak long burst
  26. Possible GRB 050922 detected by INTEGRAL
  27. GRB050918: Possible Swift/XRT detected afterglow
  28. GRB050820B: analysis of the XMM-Newton observation
  29. GRB050916: Swift/UVOT Upper Limits
  30. GRB 050916: Swift-BAT refined analysis
  31. GRB 050918 - A long GRB detected by INTEGRAL
  32. GRB 050915a: Radio Observations
  33. Swift-BAT trigger 155764 is not a GRB
  34. Swift-BAT trigger 155764 is probably not a GRB
  35. Swift trigger 155764: bad XRT centroid
  36. GRB050916 : Swift-XRT refined analysis
  37. GRB 050916: XRT position
  38. GRB 050915b, SMARTS optical/IR observations of the XRT position
  39. GRB 050915B: Swift/UVOT Upper Limits
  40. GRB050916: Swift-BAT detection of a long weak burst
  41. GRB 050915a: IR Transient
  42. GRB 050915B: XRT position
  43. GRB 050915b, SMARTS optical/IR observations
  44. GRB050915B: Swift-BAT detection of a long bright burst
  45. GRB 050915: KAIT optical limit
  46. GRB 050915: IR Observations
  47. GRB 050915: Swift XRT refined analysis
  48. GRB 050915: Swift-BAT refined analysis
  49. GRB050915: P60 Optical Observations
  50. GRB050915, optical observations
  51. GRB050915: XRT position
  52. GRB 050915: ROTSE-III optical limits
  53. GRB 050915: Swift detection of a GRB
  54. GRB050911: Upper limit on X-ray afterglow
  55. Swift-BAT trigger 155072 ground analysis
  56. GRB050914: XRT position probably due to cosmic ray
  57. GRB 050911: LCO limits on a variable source
  58. GRB 050908: DEIMOS spectrum and further analysis
  59. Swift is in normal operation
  60. GRB050911: Swift UVOT followup observations
  61. GRB 050911, optical content of Swift/XRT error box
  62. GRB050911: Swift-XRT position
  63. GRB 050911: LCO observations
  64. GRB 050911, optical observations
  65. GRB 050911: Swift-BAT refined analysis
  66. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  67. GRB 050911: z~0.16 cluster in the field
  68. GRB050911: Swift-BAT detection of a long burst
  69. GRB050908: detection of Swift/UVOT optical counterpart
  70. GRB 050910a: TAROT early optical limits
  71. WIRO observations in I of GRB 050908
  72. GRB 050906: Possible X-ray Counterpart
  73. GRB 050906: RTT150 optical observations
  74. GRB050908: Swift/UVOT Early upper limits
  75. GRB050908: VLT R-band decay index.
  76. GRB050908 : Swift-XRT refined analysis
  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. GRB050906: P60 Observations
  98. GRB 050904: more VLT NIR observations
  99. GRB 050904: BOOTES early R-band observation
  100. GRB 050906: Swift/BAT Detection of a possible burst

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