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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"

32576 results found.

  1. GRB 051006: XRT position
  2. GRB 050906, summary of radio observations
  3. Swift-BAT triggers 158261 and 158262 Retraction
  4. GRB051001: Swift UVOT Upper Limits
  5. GRB 050925: Second Epoch WSRT Radio Observations
  6. GRB 051001: Swift XRT refined analysis
  7. GRB 051001, optical observations at Mt. John
  8. GRB 051001: I-band limit
  9. GRB 051001: AAT infra-red observations
  10. GRB 051001: Swift-BAT refined analysis
  11. GRB 051001: ROTSE-III Optical Limits
  12. GRB050908: optical observations
  13. GRB050922B: optical limit
  14. GRB 050922C: further VLT observations
  15. GRB 050820A: NIR photometry at the TNG
  16. GRB050922C: UVES/VLT high resolution spectroscopy
  17. GRB050925: Swift/XRT limits
  18. GRB/SGR 050925: IR Observations
  19. GRB050922C - Swift UVOT preliminary analysis
  20. GRB 050922C: break in the lightcurve
  21. GRB 050925: WSRT Radio Observations
  22. GRB050925: Swift UVOT upper limits
  23. Refined analysis of the Swift-BAT soft short burst
  24. GRB 050925 : I-band observation at Xinglong observatory
  25. GRB 050922B: Correction to BAT refined analysis, longer burst
  26. GRB050922C: TNG spectroscopic observations
  27. GRB050922B: refined XRT analysis
  28. Konus-Wind observation of GRB 050922C
  29. GRB 050922C: Refined redshift
  30. GRB050922B: Swift UVOT early upper limits.
  31. GRB OT observation
  32. GRB050922C: observation at MonteBoo
  33. INT 2.5m limit for GRB050922B
  34. GRB 050922B: optical limit
  35. GRB050922C: Optical Observations
  36. GRB 050922C: Swift XRT refined analysis
  37. HETE Fregate observations of GRB 050922C
  38. GRB 050922C: Swift-BAT refined analysis
  39. GRB 050922B: Swift-BAT refined analysis
  40. GRB050922C: optical observations
  41. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  42. GRB 050922C: NOT optical observations
  43. GRB 050922A: Analysis of Swift/XRT TOO observation
  44. GRB 050922C: Swift detection of a bright burst
  45. GRB 050922C: ROTSE-IIId Refined Analysis
  46. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  47. GRB 050922B: ROTSE-III Optical Limits
  48. GRB050918: Possible Swift/XRT detected afterglow
  49. GRB050916: Swift/UVOT Upper Limits
  50. GRB 050916: Swift-BAT refined analysis
  51. GRB 050915a: Radio Observations
  52. Swift-BAT trigger 155764 is not a GRB
  53. Swift-BAT trigger 155764 is probably not a GRB
  54. GRB050916 : Swift-XRT refined analysis
  55. GRB 050916: XRT position
  56. GRB 050915b, SMARTS optical/IR observations of the XRT position
  57. GRB 050915B: Swift-BAT refined analysis
  58. GRB 050915B: Swift/UVOT Upper Limits
  59. GRB 050915a: IR Transient
  60. GRB 050915B: XRT position
  61. GRB 050915b, SMARTS optical/IR observations
  62. GRB050915: Swift/UVOT upper limits
  63. GRB 050915: KAIT optical limit
  64. GRB 050915: IR Observations
  65. GRB 050915: Swift XRT refined analysis
  66. GRB 050915: Swift-BAT refined analysis
  67. GRB050915: P60 Optical Observations
  68. GRB050915, optical observations
  69. GRB050915: XRT position
  70. GRB 050915: ROTSE-III optical limits
  71. GRB050911: Upper limit on X-ray afterglow
  72. Swift-BAT trigger 155072 ground analysis
  73. Swift-BAT trigger 155072 is probably not a GRB
  74. GRB 050911: LCO limits on a variable source
  75. GRB 050908: DEIMOS spectrum and further analysis
  76. Swift is in normal operation
  77. GRB050911: Swift UVOT followup observations
  78. GRB050911: Swift-XRT position
  79. GRB 050911: LCO observations
  80. GRB 050911, optical observations
  81. GRB 050911: Swift-BAT refined analysis
  82. GRB 050911: z~0.16 cluster in the field
  83. GRB050908: detection of Swift/UVOT optical counterpart
  84. GRB 050910a: TAROT early optical limits
  85. RBO GRB 050908 observations
  86. WIRO observations in I of GRB 050908
  87. GRB 050906: Possible X-ray Counterpart
  88. GRB 050906: RTT150 optical observations
  89. GRB050908: Swift/UVOT Early upper limits
  90. GRB050908: VLT R-band decay index.
  91. GRB 050908: Swift-BAT refined analysis
  92. GRB 050908: Optical observations
  93. Gemini Spectroscopy of GRB 050908
  94. GRB 050908: spectroscopic redshift
  95. GRB 050908: Prompt PROMPT Observations
  96. GRB 050908 : Swift XRT position
  97. GRB 050908: KAIT observations
  98. GRB 050908: P60 Confirmation of Optical Afterglow
  99. GRB 050908: Optical Observations
  100. GRB 050906: Optical observations at the Very Large Telescope

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