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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"

32764 results found.

  1. GRB050922B: optical limit
  2. GRB 050922C: further VLT observations
  3. GRB 050820A: NIR photometry at the TNG
  4. GRB050922C: UVES/VLT high resolution spectroscopy
  5. GRB050925: Swift/XRT limits
  6. GRB/SGR 050925: IR Observations
  7. GRB050922C - Swift UVOT preliminary analysis
  8. GRB 050922C: break in the lightcurve
  9. GRB 050925: WSRT Radio Observations
  10. GRB050925: Swift UVOT upper limits
  11. Refined analysis of the Swift-BAT soft short burst
  12. GRB 050925 : I-band observation at Xinglong observatory
  13. GRB 050922B: Correction to BAT refined analysis, longer burst
  14. GRB050922C: TNG spectroscopic observations
  15. GRB050922B: refined XRT analysis
  16. Konus-Wind observation of GRB 050922C
  17. GRB 050922C: Refined redshift
  18. GRB050922B: Swift UVOT early upper limits.
  19. GRB OT observation
  20. GRB050922C: observation at MonteBoo
  21. INT 2.5m limit for GRB050922B
  22. GRB 050922B: optical limit
  23. GRB050922C: Optical Observations
  24. GRB 050922C: Swift XRT refined analysis
  25. HETE Fregate observations of GRB 050922C
  26. GRB 050922C: Swift-BAT refined analysis
  27. GRB 050922B: Swift-BAT refined analysis
  28. GRB050922C: optical observations
  29. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  30. GRB 050922C: NOT optical observations
  31. GRB 050922A: Analysis of Swift/XRT TOO observation
  32. GRB 050922C: Swift detection of a bright burst
  33. GRB 050922C: ROTSE-IIId Refined Analysis
  34. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  35. GRB 050922B: ROTSE-III Optical Limits
  36. GRB050918: Possible Swift/XRT detected afterglow
  37. GRB050916: Swift/UVOT Upper Limits
  38. GRB 050916: Swift-BAT refined analysis
  39. GRB 050915a: Radio Observations
  40. Swift-BAT trigger 155764 is not a GRB
  41. Swift-BAT trigger 155764 is probably not a GRB
  42. GRB050916 : Swift-XRT refined analysis
  43. GRB 050916: XRT position
  44. GRB 050915b, SMARTS optical/IR observations of the XRT position
  45. GRB 050915B: Swift-BAT refined analysis
  46. GRB 050915B: Swift/UVOT Upper Limits
  47. GRB 050915a: IR Transient
  48. GRB 050915B: XRT position
  49. GRB 050915b, SMARTS optical/IR observations
  50. GRB050915: Swift/UVOT upper limits
  51. GRB 050915: KAIT optical limit
  52. GRB 050915: IR Observations
  53. GRB 050915: Swift XRT refined analysis
  54. GRB 050915: Swift-BAT refined analysis
  55. GRB050915: P60 Optical Observations
  56. GRB050915, optical observations
  57. GRB050915: XRT position
  58. GRB 050915: ROTSE-III optical limits
  59. GRB050911: Upper limit on X-ray afterglow
  60. Swift-BAT trigger 155072 ground analysis
  61. Swift-BAT trigger 155072 is probably not a GRB
  62. GRB 050911: LCO limits on a variable source
  63. GRB 050908: DEIMOS spectrum and further analysis
  64. Swift is in normal operation
  65. GRB050911: Swift UVOT followup observations
  66. GRB050911: Swift-XRT position
  67. GRB 050911: LCO observations
  68. GRB 050911, optical observations
  69. GRB 050911: Swift-BAT refined analysis
  70. GRB 050911: z~0.16 cluster in the field
  71. GRB050908: detection of Swift/UVOT optical counterpart
  72. GRB 050910a: TAROT early optical limits
  73. RBO GRB 050908 observations
  74. WIRO observations in I of GRB 050908
  75. GRB 050906: Possible X-ray Counterpart
  76. GRB 050906: RTT150 optical observations
  77. GRB050908: Swift/UVOT Early upper limits
  78. GRB050908: VLT R-band decay index.
  79. GRB 050908: Swift-BAT refined analysis
  80. GRB 050908: Optical observations
  81. Gemini Spectroscopy of GRB 050908
  82. GRB 050908: spectroscopic redshift
  83. GRB 050908: Prompt PROMPT Observations
  84. GRB 050908 : Swift XRT position
  85. GRB 050908: KAIT observations
  86. GRB 050908: P60 Confirmation of Optical Afterglow
  87. GRB 050908: Optical Observations
  88. GRB 050906: Optical observations at the Very Large Telescope
  89. GRB050904: CrAO optical observations
  90. GRB 050904 BAT refined analysis of complete data set
  91. GRB 050904: Subaru Optical Spectroscopy
  92. GRB 050906: MARGE Optical Limits
  93. GRB 050906: Swift-BAT refined analysis
  94. GRB 050906: Swift XRT upper limit
  95. GRB 050906: Radio Observations
  96. GRB 050904: Keck I-band Imaging
  97. GRB050906: P60 Observations
  98. GRB 050904: more VLT NIR observations
  99. GRB 050904: BOOTES early R-band observation
  100. GRB 050906: Bright galaxy in BAT error box

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