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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"

41925 results found.

  1. GRB050925: Swift UVOT upper limits
  2. Refined analysis of the Swift-BAT soft short burst
  3. GRB 050925 : I-band observation at Xinglong observatory
  4. GRB050925: Faulkes Telescope North R-band limit
  5. GRB050925: Swift-BAT detection of a short burst
  6. GRB050922C: TNG spectroscopic observations
  7. GRB050922B: refined XRT analysis
  8. Konus-Wind observation of GRB 050922C
  9. GRB050922B: Swift UVOT early upper limits.
  10. GRB OT observation
  11. GRB050922C: observation at MonteBoo
  12. INT 2.5m limit for GRB050922B
  13. GRB050922C: Optical Observations
  14. GRB 050922C: Swift XRT refined analysis
  15. HETE Fregate observations of GRB 050922C
  16. GRB 050922C: Swift-BAT refined analysis
  17. GRB050922C: optical observations
  18. GRB 050922C: optical obserations
  19. GRB 050922C: NOT optical observations
  20. GRB 050922C: Swift detection of a bright burst
  21. GRB 050922C: ROTSE-IIId Refined Analysis
  22. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  23. GRB 050922B,optical observation
  24. GRB050922B: Swift-BAT detection of a weak long burst
  25. Possible GRB 050922 detected by INTEGRAL
  26. GRB050918: Possible Swift/XRT detected afterglow
  27. GRB050820B: analysis of the XMM-Newton observation
  28. GRB 050918 - A long GRB detected by INTEGRAL
  29. GRB 050915a: Radio Observations
  30. Swift-BAT trigger 155764 is not a GRB
  31. Swift-BAT trigger 155535 is definitely not a GRB
  32. GRB050916 : Swift-XRT refined analysis
  33. GRB 050915b, SMARTS optical/IR observations of the XRT position
  34. GRB 050915B: Swift-BAT refined analysis
  35. GRB 050915B: Swift/UVOT Upper Limits
  36. GRB050916: Swift-BAT detection of a long weak burst
  37. GRB 050915a: IR Transient
  38. GRB 050915b, SMARTS optical/IR observations
  39. GRB050915B: Swift-BAT detection of a long bright burst
  40. GRB050915: Swift/UVOT upper limits
  41. GRB 050915: KAIT optical limit
  42. GRB 050915: IR Observations
  43. GRB 050915: Swift XRT refined analysis
  44. GRB050915: P60 Optical Observations
  45. GRB050915, optical observations
  46. GRB050915: XRT position
  47. GRB 050915: ROTSE-III optical limits
  48. GRB 050915: Swift detection of a GRB
  49. Swift-BAT trigger 155072 ground analysis
  50. Swift-BAT trigger 155072 is probably not a GRB
  51. GRB 050911: LCO limits on a variable source
  52. GRB 050908: DEIMOS spectrum and further analysis
  53. GRB050911: Swift UVOT followup observations
  54. GRB 050911, optical content of Swift/XRT error box
  55. GRB050911: Swift-XRT position
  56. GRB 050911: LCO observations
  57. GRB 050911, optical observations
  58. GRB 050911: Swift-BAT refined analysis
  59. GRB 050911: z~0.16 cluster in the field
  60. GRB050911: Swift-BAT detection of a long burst
  61. GRB050908: detection of Swift/UVOT optical counterpart
  62. GRB 050910a: TAROT early optical limits
  63. RBO GRB 050908 observations
  64. WIRO observations in I of GRB 050908
  65. GRB 050906: Possible X-ray Counterpart
  66. GRB 050906: RTT150 optical observations
  67. GRB050908: Swift/UVOT Early upper limits
  68. GRB050908: VLT R-band decay index.
  69. GRB050908 : Swift-XRT refined analysis
  70. GRB 050908: Swift-BAT refined analysis
  71. GRB 050908: Optical observations
  72. Gemini Spectroscopy of GRB 050908
  73. GRB 050908: spectroscopic redshift
  74. GRB 050908: Prompt PROMPT Observations
  75. GRB 050908 : Swift XRT position
  76. GRB 050908: KAIT observations
  77. GRB 050908: P60 Confirmation of Optical Afterglow
  78. GRB 050908: Optical Observations
  79. GRB 050908: Swift detection of a burst
  80. Swift trigger 154073 is not a GRB
  81. GRB 050906: Optical observations at the Very Large Telescope
  82. GRB050904: CrAO optical observations
  83. GRB 050904 BAT refined analysis of complete data set
  84. GRB 050904: Subaru Optical Spectroscopy
  85. GRB 050906: MARGE Optical Limits
  86. GRB 050906: Swift-BAT refined analysis
  87. GRB 050906: Swift XRT upper limit
  88. GRB 050906: Radio Observations
  89. GRB 050904: Keck I-band Imaging
  90. GRB050906: P60 Observations
  91. GRB 050904: more VLT NIR observations
  92. GRB 050904: BOOTES early R-band observation
  93. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  94. GRB 050906: Swift/BAT Detection of a possible burst
  95. GRB 050904: More SOAR
  96. GRB 050904: photometric redshift
  97. GRB 050904: Swift/UVOT observations
  98. GRB 050904: Afterglow Astrometry
  99. GRB 050904: NIR object inside the XRT error box
  100. GRB 050904: early Swift XRT analysis results

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