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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"

32739 results found.

  1. GRB 050922C: Swift-BAT refined analysis
  2. GRB 050922B: Swift-BAT refined analysis
  3. GRB050922C: optical observations
  4. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  5. GRB 050922C: NOT optical observations
  6. GRB 050922A: Analysis of Swift/XRT TOO observation
  7. GRB 050922C: Swift detection of a bright burst
  8. GRB 050922C: ROTSE-IIId Refined Analysis
  9. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  10. GRB 050922B: ROTSE-III Optical Limits
  11. GRB050918: Possible Swift/XRT detected afterglow
  12. GRB050916: Swift/UVOT Upper Limits
  13. GRB 050916: Swift-BAT refined analysis
  14. GRB 050915a: Radio Observations
  15. Swift-BAT trigger 155764 is not a GRB
  16. Swift-BAT trigger 155764 is probably not a GRB
  17. GRB050916 : Swift-XRT refined analysis
  18. GRB 050916: XRT position
  19. GRB 050915b, SMARTS optical/IR observations of the XRT position
  20. GRB 050915B: Swift-BAT refined analysis
  21. GRB 050915B: Swift/UVOT Upper Limits
  22. GRB 050915a: IR Transient
  23. GRB 050915B: XRT position
  24. GRB 050915b, SMARTS optical/IR observations
  25. GRB050915: Swift/UVOT upper limits
  26. GRB 050915: KAIT optical limit
  27. GRB 050915: IR Observations
  28. GRB 050915: Swift XRT refined analysis
  29. GRB 050915: Swift-BAT refined analysis
  30. GRB050915: P60 Optical Observations
  31. GRB050915, optical observations
  32. GRB050915: XRT position
  33. GRB 050915: ROTSE-III optical limits
  34. GRB050911: Upper limit on X-ray afterglow
  35. Swift-BAT trigger 155072 ground analysis
  36. Swift-BAT trigger 155072 is probably not a GRB
  37. GRB 050911: LCO limits on a variable source
  38. GRB 050908: DEIMOS spectrum and further analysis
  39. Swift is in normal operation
  40. GRB050911: Swift UVOT followup observations
  41. GRB050911: Swift-XRT position
  42. GRB 050911: LCO observations
  43. GRB 050911, optical observations
  44. GRB 050911: Swift-BAT refined analysis
  45. GRB 050911: z~0.16 cluster in the field
  46. GRB050908: detection of Swift/UVOT optical counterpart
  47. GRB 050910a: TAROT early optical limits
  48. RBO GRB 050908 observations
  49. WIRO observations in I of GRB 050908
  50. GRB 050906: Possible X-ray Counterpart
  51. GRB 050906: RTT150 optical observations
  52. GRB050908: Swift/UVOT Early upper limits
  53. GRB050908: VLT R-band decay index.
  54. GRB 050908: Swift-BAT refined analysis
  55. GRB 050908: Optical observations
  56. Gemini Spectroscopy of GRB 050908
  57. GRB 050908: spectroscopic redshift
  58. GRB 050908: Prompt PROMPT Observations
  59. GRB 050908 : Swift XRT position
  60. GRB 050908: KAIT observations
  61. GRB 050908: P60 Confirmation of Optical Afterglow
  62. GRB 050908: Optical Observations
  63. GRB 050906: Optical observations at the Very Large Telescope
  64. GRB050904: CrAO optical observations
  65. GRB 050904 BAT refined analysis of complete data set
  66. GRB 050904: Subaru Optical Spectroscopy
  67. GRB 050906: MARGE Optical Limits
  68. GRB 050906: Swift-BAT refined analysis
  69. GRB 050906: Swift XRT upper limit
  70. GRB 050906: Radio Observations
  71. GRB 050904: Keck I-band Imaging
  72. GRB050906: P60 Observations
  73. GRB 050904: more VLT NIR observations
  74. GRB 050904: BOOTES early R-band observation
  75. GRB 050906: Bright galaxy in BAT error box
  76. GRB 050906: Swift/BAT Detection of a possible burst
  77. GRB 050904: More SOAR
  78. GRB 050904: photometric redshift
  79. GRB 050904: Swift/UVOT observations
  80. GRB 050904: Afterglow Astrometry
  81. GRB 050904: NIR object inside the XRT error box
  82. GRB 050904: early Swift XRT analysis results
  83. GRB 050904: SOAR YJ and PROMPT Ic Observations
  84. GRB 050904: BAT refined analysis of partial data set
  85. GRB050904: Optical Observations
  86. GRB 050904: Environmental Constraints
  87. GRB 050904: Possible High-Redshift GRB
  88. GRB 050904: SOAR/PROMPT Observations
  89. GRB050904: P60 Observations
  90. GRB 050904: TAROT optical limits
  91. GRB 050824: MDM Observations
  92. GRB 050827: Swift XRT preliminary analysis results
  93. GRB 050827 : OSN 1.5m optical observations
  94. GRB 050827: P200 NIR Observations
  95. GRB050827: Swift/UVOT upper limits
  96. GRB 050827: Optical Limit
  97. GRB 050827: XRT possible afterglow detection
  98. GRB 050826 : Lulin R band observation
  99. GRB050824: Maidanak optical limits
  100. GRB050820A: RTT150 optical observations

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