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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"

32756 results found.

  1. GRB 050925: WSRT Radio Observations
  2. GRB050925: Swift UVOT upper limits
  3. Refined analysis of the Swift-BAT soft short burst
  4. GRB 050925 : I-band observation at Xinglong observatory
  5. GRB 050922B: Correction to BAT refined analysis, longer burst
  6. GRB050922C: TNG spectroscopic observations
  7. GRB050922B: refined XRT analysis
  8. Konus-Wind observation of GRB 050922C
  9. GRB 050922C: Refined redshift
  10. GRB050922B: Swift UVOT early upper limits.
  11. GRB OT observation
  12. GRB050922C: observation at MonteBoo
  13. INT 2.5m limit for GRB050922B
  14. GRB 050922B: optical limit
  15. GRB050922C: Optical Observations
  16. GRB 050922C: Swift XRT refined analysis
  17. HETE Fregate observations of GRB 050922C
  18. GRB 050922C: Swift-BAT refined analysis
  19. GRB 050922B: Swift-BAT refined analysis
  20. GRB050922C: optical observations
  21. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  22. GRB 050922C: NOT optical observations
  23. GRB 050922A: Analysis of Swift/XRT TOO observation
  24. GRB 050922C: Swift detection of a bright burst
  25. GRB 050922C: ROTSE-IIId Refined Analysis
  26. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  27. GRB 050922B: ROTSE-III Optical Limits
  28. GRB050918: Possible Swift/XRT detected afterglow
  29. GRB050916: Swift/UVOT Upper Limits
  30. GRB 050916: Swift-BAT refined analysis
  31. GRB 050915a: Radio Observations
  32. Swift-BAT trigger 155764 is not a GRB
  33. Swift-BAT trigger 155764 is probably not a GRB
  34. GRB050916 : Swift-XRT refined analysis
  35. GRB 050916: XRT position
  36. GRB 050915b, SMARTS optical/IR observations of the XRT position
  37. GRB 050915B: Swift-BAT refined analysis
  38. GRB 050915B: Swift/UVOT Upper Limits
  39. GRB 050915a: IR Transient
  40. GRB 050915B: XRT position
  41. GRB 050915b, SMARTS optical/IR observations
  42. GRB050915: Swift/UVOT upper limits
  43. GRB 050915: KAIT optical limit
  44. GRB 050915: IR Observations
  45. GRB 050915: Swift XRT refined analysis
  46. GRB 050915: Swift-BAT refined analysis
  47. GRB050915: P60 Optical Observations
  48. GRB050915, optical observations
  49. GRB050915: XRT position
  50. GRB 050915: ROTSE-III optical limits
  51. GRB050911: Upper limit on X-ray afterglow
  52. Swift-BAT trigger 155072 ground analysis
  53. Swift-BAT trigger 155072 is probably not a GRB
  54. GRB 050911: LCO limits on a variable source
  55. GRB 050908: DEIMOS spectrum and further analysis
  56. Swift is in normal operation
  57. GRB050911: Swift UVOT followup observations
  58. GRB050911: Swift-XRT position
  59. GRB 050911: LCO observations
  60. GRB 050911, optical observations
  61. GRB 050911: Swift-BAT refined analysis
  62. GRB 050911: z~0.16 cluster in the field
  63. GRB050908: detection of Swift/UVOT optical counterpart
  64. GRB 050910a: TAROT early optical limits
  65. RBO GRB 050908 observations
  66. WIRO observations in I of GRB 050908
  67. GRB 050906: Possible X-ray Counterpart
  68. GRB 050906: RTT150 optical observations
  69. GRB050908: Swift/UVOT Early upper limits
  70. GRB050908: VLT R-band decay index.
  71. GRB 050908: Swift-BAT refined analysis
  72. GRB 050908: Optical observations
  73. Gemini Spectroscopy of GRB 050908
  74. GRB 050908: spectroscopic redshift
  75. GRB 050908: Prompt PROMPT Observations
  76. GRB 050908 : Swift XRT position
  77. GRB 050908: KAIT observations
  78. GRB 050908: P60 Confirmation of Optical Afterglow
  79. GRB 050908: Optical Observations
  80. GRB 050906: Optical observations at the Very Large Telescope
  81. GRB050904: CrAO optical observations
  82. GRB 050904 BAT refined analysis of complete data set
  83. GRB 050904: Subaru Optical Spectroscopy
  84. GRB 050906: MARGE Optical Limits
  85. GRB 050906: Swift-BAT refined analysis
  86. GRB 050906: Swift XRT upper limit
  87. GRB 050906: Radio Observations
  88. GRB 050904: Keck I-band Imaging
  89. GRB050906: P60 Observations
  90. GRB 050904: more VLT NIR observations
  91. GRB 050904: BOOTES early R-band observation
  92. GRB 050906: Bright galaxy in BAT error box
  93. GRB 050906: Swift/BAT Detection of a possible burst
  94. GRB 050904: More SOAR
  95. GRB 050904: photometric redshift
  96. GRB 050904: Swift/UVOT observations
  97. GRB 050904: Afterglow Astrometry
  98. GRB 050904: NIR object inside the XRT error box
  99. GRB 050904: early Swift XRT analysis results
  100. GRB 050904: SOAR YJ and PROMPT Ic Observations

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