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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"

36132 results found.

  1. Possible GRB 050922 detected by INTEGRAL
  2. GRB050820B: analysis of the XMM-Newton observation
  3. GRB050916: Swift/UVOT Upper Limits
  4. GRB 050916: Swift-BAT refined analysis
  5. GRB 050918 - A long GRB detected by INTEGRAL
  6. GRB 050915a: Radio Observations
  7. Swift-BAT trigger 155764 is not a GRB
  8. Swift-BAT trigger 155764 is probably not a GRB
  9. Swift-BAT trigger 155535 is definitely not a GRB
  10. GRB 050916: XRT position
  11. GRB 050915b, SMARTS optical/IR observations of the XRT position
  12. GRB 050915B: Swift-BAT refined analysis
  13. GRB 050915B: Swift/UVOT Upper Limits
  14. GRB 050915a: IR Transient
  15. GRB 050915B: XRT position
  16. GRB 050915b, SMARTS optical/IR observations
  17. GRB 050915: KAIT optical limit
  18. GRB 050915: IR Observations
  19. GRB 050915: Swift XRT refined analysis
  20. GRB 050915: Swift-BAT refined analysis
  21. GRB050915: P60 Optical Observations
  22. GRB 050915: ROTSE-III optical limits
  23. GRB 050915: Swift detection of a GRB
  24. GRB050911: Upper limit on X-ray afterglow
  25. Swift-BAT trigger 155072 ground analysis
  26. Swift-BAT trigger 155072 is probably not a GRB
  27. GRB 050911: LCO limits on a variable source
  28. GRB 050908: DEIMOS spectrum and further analysis
  29. Swift is in normal operation
  30. GRB 050911, optical content of Swift/XRT error box
  31. GRB 050911: LCO observations
  32. GRB 050911, optical observations
  33. GRB 050911: Swift-BAT refined analysis
  34. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  35. GRB 050911: z~0.16 cluster in the field
  36. GRB 050910a: TAROT early optical limits
  37. RBO GRB 050908 observations
  38. WIRO observations in I of GRB 050908
  39. GRB 050906: Possible X-ray Counterpart
  40. GRB 050906: RTT150 optical observations
  41. GRB050908: VLT R-band decay index.
  42. GRB 050908: Swift-BAT refined analysis
  43. GRB 050908: Optical observations
  44. Gemini Spectroscopy of GRB 050908
  45. GRB 050908: spectroscopic redshift
  46. GRB 050908: Prompt PROMPT Observations
  47. GRB 050908 : Swift XRT position
  48. GRB 050908: KAIT observations
  49. GRB 050908: P60 Confirmation of Optical Afterglow
  50. GRB 050908: Optical Observations
  51. GRB 050908: Swift detection of a burst
  52. Swift trigger 154073 is not a GRB
  53. GRB 050906: Optical observations at the Very Large Telescope
  54. GRB050904: CrAO optical observations
  55. GRB 050904 BAT refined analysis of complete data set
  56. GRB 050904: Subaru Optical Spectroscopy
  57. GRB 050906: MARGE Optical Limits
  58. GRB 050906: Swift-BAT refined analysis
  59. GRB 050906: Swift XRT upper limit
  60. GRB 050906: Radio Observations
  61. GRB 050904: Keck I-band Imaging
  62. GRB 050904: more VLT NIR observations
  63. GRB 050904: BOOTES early R-band observation
  64. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  65. GRB 050906: Bright galaxy in BAT error box
  66. GRB 050906: Swift/BAT Detection of a possible burst
  67. GRB 050904: More SOAR
  68. GRB 050904: photometric redshift
  69. GRB 050904: Swift/UVOT observations
  70. GRB 050904: Afterglow Astrometry
  71. GRB 050904: NIR object inside the XRT error box
  72. GRB 050904: early Swift XRT analysis results
  73. GRB 050904: SOAR YJ and PROMPT Ic Observations
  74. GRB 050904: BAT refined analysis of partial data set
  75. GRB 050904: TAROT optical measurements
  76. GRB050904: Optical Observations
  77. GRB 050904: Environmental Constraints
  78. GRB 050904: Possible High-Redshift GRB
  79. GRB 050904: SOAR/PROMPT Observations
  80. GRB 050904: TAROT optical limits
  81. Swift-BAT triggers 153461-153465 are not GRBs
  82. GRB 050824: MDM Observations
  83. GRB 050827: Swift XRT preliminary analysis results
  84. IBAS Alerts 2641 and 2642: not a real GRB
  85. Swift Trigger #152652 is not a GRB
  86. GRB 050827 : OSN 1.5m optical observations
  87. GRB 050827: P200 NIR Observations
  88. GRB 050827: Optical Limit
  89. GRB 050827: XRT possible afterglow detection
  90. GRB 050826 : Lulin R band observation
  91. GRB050824: Maidanak optical limits
  92. GRB050820A: RTT150 optical observations
  93. GRB050827: RTT150 optical observations
  94. GRB 050827: Swift-BAT refined analysis
  95. GRB 050826: Optical Candidate
  96. GRB050824, HETE-2 Observation
  97. GRB 050826: Swift XRT preliminary analysis results
  98. GRB 050826: BAT refined analysis
  99. GRB050824: First 2 hours of power low optical decay?
  100. GRB 050826: Swift XRT position

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