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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"

37258 results found.

  1. GRB 050922B,optical observation
  2. GRB050922B: Swift-BAT detection of a weak long burst
  3. Possible GRB 050922 detected by INTEGRAL
  4. GRB050820B: analysis of the XMM-Newton observation
  5. GRB050916: Swift/UVOT Upper Limits
  6. GRB 050916: Swift-BAT refined analysis
  7. GRB 050918 - A long GRB detected by INTEGRAL
  8. GRB 050915a: Radio Observations
  9. Swift-BAT trigger 155764 is not a GRB
  10. Swift-BAT trigger 155764 is probably not a GRB
  11. Swift-BAT trigger 155535 is definitely not a GRB
  12. GRB050916 : Swift-XRT refined analysis
  13. GRB 050916: XRT position
  14. GRB 050915b, SMARTS optical/IR observations of the XRT position
  15. GRB 050915B: Swift-BAT refined analysis
  16. GRB 050915B: Swift/UVOT Upper Limits
  17. GRB 050915a: IR Transient
  18. GRB 050915B: XRT position
  19. GRB 050915b, SMARTS optical/IR observations
  20. GRB 050915: KAIT optical limit
  21. GRB 050915: IR Observations
  22. GRB 050915: Swift XRT refined analysis
  23. GRB 050915: Swift-BAT refined analysis
  24. GRB050915: P60 Optical Observations
  25. GRB 050915: ROTSE-III optical limits
  26. GRB 050915: Swift detection of a GRB
  27. GRB050911: Upper limit on X-ray afterglow
  28. Swift-BAT trigger 155072 ground analysis
  29. Swift-BAT trigger 155072 is probably not a GRB
  30. GRB 050911: LCO limits on a variable source
  31. GRB 050908: DEIMOS spectrum and further analysis
  32. Swift is in normal operation
  33. GRB 050911, optical content of Swift/XRT error box
  34. GRB050911: Swift-XRT position
  35. GRB 050911: LCO observations
  36. GRB 050911, optical observations
  37. GRB 050911: Swift-BAT refined analysis
  38. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  39. GRB 050911: z~0.16 cluster in the field
  40. GRB 050910a: TAROT early optical limits
  41. RBO GRB 050908 observations
  42. WIRO observations in I of GRB 050908
  43. GRB 050906: Possible X-ray Counterpart
  44. GRB 050906: RTT150 optical observations
  45. GRB050908: VLT R-band decay index.
  46. GRB050908 : Swift-XRT refined analysis
  47. GRB 050908: Swift-BAT refined analysis
  48. GRB 050908: Optical observations
  49. Gemini Spectroscopy of GRB 050908
  50. GRB 050908: spectroscopic redshift
  51. GRB 050908: Prompt PROMPT Observations
  52. GRB 050908 : Swift XRT position
  53. GRB 050908: KAIT observations
  54. GRB 050908: P60 Confirmation of Optical Afterglow
  55. GRB 050908: Optical Observations
  56. GRB 050908: Swift detection of a burst
  57. Swift trigger 154073 is not a GRB
  58. GRB 050906: Optical observations at the Very Large Telescope
  59. GRB050904: CrAO optical observations
  60. GRB 050904 BAT refined analysis of complete data set
  61. GRB 050904: Subaru Optical Spectroscopy
  62. GRB 050906: MARGE Optical Limits
  63. GRB 050906: Swift-BAT refined analysis
  64. GRB 050906: Swift XRT upper limit
  65. GRB 050906: Radio Observations
  66. GRB 050904: Keck I-band Imaging
  67. GRB 050904: more VLT NIR observations
  68. GRB 050904: BOOTES early R-band observation
  69. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  70. GRB 050906: Bright galaxy in BAT error box
  71. GRB 050906: Swift/BAT Detection of a possible burst
  72. GRB 050904: More SOAR
  73. GRB 050904: photometric redshift
  74. GRB 050904: Swift/UVOT observations
  75. GRB 050904: Afterglow Astrometry
  76. GRB 050904: NIR object inside the XRT error box
  77. GRB 050904: early Swift XRT analysis results
  78. GRB 050904: SOAR YJ and PROMPT Ic Observations
  79. GRB 050904: BAT refined analysis of partial data set
  80. GRB 050904: TAROT optical measurements
  81. GRB050904: Optical Observations
  82. GRB 050904: Environmental Constraints
  83. GRB 050904: Possible High-Redshift GRB
  84. GRB 050904: SOAR/PROMPT Observations
  85. GRB 050904: TAROT optical limits
  86. GRB050904: Swift-BAT detection of a probable burst
  87. Swift-BAT triggers 153461-153465 are not GRBs
  88. GRB 050824: MDM Observations
  89. GRB 050827: Swift XRT preliminary analysis results
  90. IBAS Alerts 2641 and 2642: not a real GRB
  91. Swift Trigger #152652 is not a GRB
  92. GRB 050827 : OSN 1.5m optical observations
  93. GRB 050827: P200 NIR Observations
  94. GRB 050827: Optical Limit
  95. GRB 050827: XRT possible afterglow detection
  96. GRB 050826 : Lulin R band observation
  97. GRB050824: Maidanak optical limits
  98. GRB050820A: RTT150 optical observations
  99. GRB050827: RTT150 optical observations
  100. GRB 050827: Swift-BAT refined analysis

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