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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"

32572 results found.

  1. GRB 050925: Second Epoch WSRT Radio Observations
  2. GRB 051001: Swift XRT refined analysis
  3. GRB 051001, optical observations at Mt. John
  4. GRB 051001: I-band limit
  5. GRB 051001: AAT infra-red observations
  6. GRB 051001: Swift-BAT refined analysis
  7. GRB 051001: ROTSE-III Optical Limits
  8. GRB050908: optical observations
  9. GRB050922B: optical limit
  10. GRB 050922C: further VLT observations
  11. GRB 050820A: NIR photometry at the TNG
  12. GRB050922C: UVES/VLT high resolution spectroscopy
  13. GRB050925: Swift/XRT limits
  14. GRB/SGR 050925: IR Observations
  15. GRB050922C - Swift UVOT preliminary analysis
  16. GRB 050922C: break in the lightcurve
  17. GRB 050925: WSRT Radio Observations
  18. GRB050925: Swift UVOT upper limits
  19. Refined analysis of the Swift-BAT soft short burst
  20. GRB 050925 : I-band observation at Xinglong observatory
  21. GRB 050922B: Correction to BAT refined analysis, longer burst
  22. GRB050922C: TNG spectroscopic observations
  23. GRB050922B: refined XRT analysis
  24. Konus-Wind observation of GRB 050922C
  25. GRB 050922C: Refined redshift
  26. GRB050922B: Swift UVOT early upper limits.
  27. GRB OT observation
  28. GRB050922C: observation at MonteBoo
  29. INT 2.5m limit for GRB050922B
  30. GRB 050922B: optical limit
  31. GRB050922C: Optical Observations
  32. GRB 050922C: Swift XRT refined analysis
  33. HETE Fregate observations of GRB 050922C
  34. GRB 050922C: Swift-BAT refined analysis
  35. GRB 050922B: Swift-BAT refined analysis
  36. GRB050922C: optical observations
  37. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  38. GRB 050922C: NOT optical observations
  39. GRB 050922A: Analysis of Swift/XRT TOO observation
  40. GRB 050922C: Swift detection of a bright burst
  41. GRB 050922C: ROTSE-IIId Refined Analysis
  42. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  43. GRB 050922B: ROTSE-III Optical Limits
  44. GRB050918: Possible Swift/XRT detected afterglow
  45. GRB050916: Swift/UVOT Upper Limits
  46. GRB 050916: Swift-BAT refined analysis
  47. GRB 050915a: Radio Observations
  48. Swift-BAT trigger 155764 is not a GRB
  49. Swift-BAT trigger 155764 is probably not a GRB
  50. GRB050916 : Swift-XRT refined analysis
  51. GRB 050916: XRT position
  52. GRB 050915b, SMARTS optical/IR observations of the XRT position
  53. GRB 050915B: Swift-BAT refined analysis
  54. GRB 050915B: Swift/UVOT Upper Limits
  55. GRB 050915a: IR Transient
  56. GRB 050915B: XRT position
  57. GRB 050915b, SMARTS optical/IR observations
  58. GRB050915: Swift/UVOT upper limits
  59. GRB 050915: KAIT optical limit
  60. GRB 050915: IR Observations
  61. GRB 050915: Swift XRT refined analysis
  62. GRB 050915: Swift-BAT refined analysis
  63. GRB050915: P60 Optical Observations
  64. GRB050915, optical observations
  65. GRB050915: XRT position
  66. GRB 050915: ROTSE-III optical limits
  67. GRB050911: Upper limit on X-ray afterglow
  68. Swift-BAT trigger 155072 ground analysis
  69. Swift-BAT trigger 155072 is probably not a GRB
  70. GRB 050911: LCO limits on a variable source
  71. GRB 050908: DEIMOS spectrum and further analysis
  72. Swift is in normal operation
  73. GRB050911: Swift UVOT followup observations
  74. GRB050911: Swift-XRT position
  75. GRB 050911: LCO observations
  76. GRB 050911, optical observations
  77. GRB 050911: Swift-BAT refined analysis
  78. GRB 050911: z~0.16 cluster in the field
  79. GRB050908: detection of Swift/UVOT optical counterpart
  80. GRB 050910a: TAROT early optical limits
  81. RBO GRB 050908 observations
  82. WIRO observations in I of GRB 050908
  83. GRB 050906: Possible X-ray Counterpart
  84. GRB 050906: RTT150 optical observations
  85. GRB050908: Swift/UVOT Early upper limits
  86. GRB050908: VLT R-band decay index.
  87. GRB 050908: Swift-BAT refined analysis
  88. GRB 050908: Optical observations
  89. Gemini Spectroscopy of GRB 050908
  90. GRB 050908: spectroscopic redshift
  91. GRB 050908: Prompt PROMPT Observations
  92. GRB 050908 : Swift XRT position
  93. GRB 050908: KAIT observations
  94. GRB 050908: P60 Confirmation of Optical Afterglow
  95. GRB 050908: Optical Observations
  96. GRB 050906: Optical observations at the Very Large Telescope
  97. GRB050904: CrAO optical observations
  98. GRB 050904 BAT refined analysis of complete data set
  99. GRB 050904: Subaru Optical Spectroscopy
  100. GRB 050906: MARGE Optical Limits

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