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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"

41915 results found.

  1. GRB050922C: observation at MonteBoo
  2. INT 2.5m limit for GRB050922B
  3. GRB050922C: Optical Observations
  4. GRB 050922C: Swift XRT refined analysis
  5. HETE Fregate observations of GRB 050922C
  6. GRB 050922C: Swift-BAT refined analysis
  7. GRB050922C: optical observations
  8. GRB 050922C: optical obserations
  9. GRB 050922C: NOT optical observations
  10. GRB 050922C: Swift detection of a bright burst
  11. GRB 050922C: ROTSE-IIId Refined Analysis
  12. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  13. GRB 050922B,optical observation
  14. GRB050922B: Swift-BAT detection of a weak long burst
  15. Possible GRB 050922 detected by INTEGRAL
  16. GRB050918: Possible Swift/XRT detected afterglow
  17. GRB050820B: analysis of the XMM-Newton observation
  18. GRB 050918 - A long GRB detected by INTEGRAL
  19. GRB 050915a: Radio Observations
  20. Swift-BAT trigger 155764 is not a GRB
  21. Swift-BAT trigger 155535 is definitely not a GRB
  22. GRB050916 : Swift-XRT refined analysis
  23. GRB 050915b, SMARTS optical/IR observations of the XRT position
  24. GRB 050915B: Swift-BAT refined analysis
  25. GRB 050915B: Swift/UVOT Upper Limits
  26. GRB050916: Swift-BAT detection of a long weak burst
  27. GRB 050915a: IR Transient
  28. GRB 050915b, SMARTS optical/IR observations
  29. GRB050915B: Swift-BAT detection of a long bright burst
  30. GRB050915: Swift/UVOT upper limits
  31. GRB 050915: KAIT optical limit
  32. GRB 050915: IR Observations
  33. GRB 050915: Swift XRT refined analysis
  34. GRB050915: P60 Optical Observations
  35. GRB050915, optical observations
  36. GRB050915: XRT position
  37. GRB 050915: ROTSE-III optical limits
  38. GRB 050915: Swift detection of a GRB
  39. Swift-BAT trigger 155072 ground analysis
  40. Swift-BAT trigger 155072 is probably not a GRB
  41. GRB 050911: LCO limits on a variable source
  42. GRB 050908: DEIMOS spectrum and further analysis
  43. GRB050911: Swift UVOT followup observations
  44. GRB 050911, optical content of Swift/XRT error box
  45. GRB050911: Swift-XRT position
  46. GRB 050911: LCO observations
  47. GRB 050911, optical observations
  48. GRB 050911: Swift-BAT refined analysis
  49. GRB 050911: z~0.16 cluster in the field
  50. GRB050911: Swift-BAT detection of a long burst
  51. GRB050908: detection of Swift/UVOT optical counterpart
  52. GRB 050910a: TAROT early optical limits
  53. RBO GRB 050908 observations
  54. WIRO observations in I of GRB 050908
  55. GRB 050906: Possible X-ray Counterpart
  56. GRB 050906: RTT150 optical observations
  57. GRB050908: Swift/UVOT Early upper limits
  58. GRB050908: VLT R-band decay index.
  59. GRB050908 : Swift-XRT refined analysis
  60. GRB 050908: Swift-BAT refined analysis
  61. GRB 050908: Optical observations
  62. Gemini Spectroscopy of GRB 050908
  63. GRB 050908: spectroscopic redshift
  64. GRB 050908: Prompt PROMPT Observations
  65. GRB 050908 : Swift XRT position
  66. GRB 050908: KAIT observations
  67. GRB 050908: P60 Confirmation of Optical Afterglow
  68. GRB 050908: Optical Observations
  69. GRB 050908: Swift detection of a burst
  70. Swift trigger 154073 is not a GRB
  71. GRB 050906: Optical observations at the Very Large Telescope
  72. GRB050904: CrAO optical observations
  73. GRB 050904 BAT refined analysis of complete data set
  74. GRB 050904: Subaru Optical Spectroscopy
  75. GRB 050906: MARGE Optical Limits
  76. GRB 050906: Swift-BAT refined analysis
  77. GRB 050906: Swift XRT upper limit
  78. GRB 050906: Radio Observations
  79. GRB 050904: Keck I-band Imaging
  80. GRB050906: P60 Observations
  81. GRB 050904: more VLT NIR observations
  82. GRB 050904: BOOTES early R-band observation
  83. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  84. GRB 050906: Swift/BAT Detection of a possible burst
  85. GRB 050904: More SOAR
  86. GRB 050904: photometric redshift
  87. GRB 050904: Swift/UVOT observations
  88. GRB 050904: Afterglow Astrometry
  89. GRB 050904: NIR object inside the XRT error box
  90. GRB 050904: early Swift XRT analysis results
  91. GRB 050904: SOAR YJ and PROMPT Ic Observations
  92. GRB 050904: BAT refined analysis of partial data set
  93. GRB050904: Optical Observations
  94. GRB 050904: Environmental Constraints
  95. GRB 050904: Possible High-Redshift GRB
  96. GRB 050904: SOAR/PROMPT Observations
  97. GRB050904: P60 Observations
  98. GRB 050904: TAROT optical limits
  99. GRB050904: Swift-BAT detection of a probable burst
  100. Retraction of Swift-BAT trigger #153355

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