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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"

41992 results found.

  1. INT 2.5m limit for GRB050922B
  2. GRB 050922B: optical limit
  3. GRB050922C: Optical Observations
  4. GRB 050922C: Swift XRT refined analysis
  5. HETE Fregate observations of GRB 050922C
  6. GRB 050922C: Swift-BAT refined analysis
  7. GRB 050922B: Swift-BAT refined analysis
  8. GRB050922C: optical observations
  9. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  10. GRB 050922C: optical obserations
  11. GRB 050922C: NOT optical observations
  12. GRB 050922A: Analysis of Swift/XRT TOO observation
  13. GRB 050922C: Swift detection of a bright burst
  14. GRB 050922C: ROTSE-IIId Refined Analysis
  15. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  16. GRB 050922B: ROTSE-III Optical Limits
  17. GRB050922B: Swift-BAT detection of a weak long burst
  18. Possible GRB 050922 detected by INTEGRAL
  19. GRB050918: Possible Swift/XRT detected afterglow
  20. GRB050820B: analysis of the XMM-Newton observation
  21. GRB050916: Swift/UVOT Upper Limits
  22. GRB 050916: Swift-BAT refined analysis
  23. GRB 050918 - A long GRB detected by INTEGRAL
  24. GRB 050915a: Radio Observations
  25. Swift-BAT trigger 155764 is not a GRB
  26. Swift-BAT trigger 155764 is probably not a GRB
  27. Swift trigger 155764: bad XRT centroid
  28. Swift-BAT trigger 155535 is definitely not a GRB
  29. GRB050916 : Swift-XRT refined analysis
  30. GRB 050916: XRT position
  31. GRB 050915b, SMARTS optical/IR observations of the XRT position
  32. GRB 050915B: Swift-BAT refined analysis
  33. GRB 050915B: Swift/UVOT Upper Limits
  34. GRB050916: Swift-BAT detection of a long weak burst
  35. GRB 050915a: IR Transient
  36. GRB 050915B: XRT position
  37. GRB 050915b, SMARTS optical/IR observations
  38. GRB050915B: Swift-BAT detection of a long bright burst
  39. GRB050915: Swift/UVOT upper limits
  40. GRB 050915: KAIT optical limit
  41. GRB 050915: IR Observations
  42. GRB 050915: Swift XRT refined analysis
  43. GRB 050915: Swift-BAT refined analysis
  44. GRB050915: P60 Optical Observations
  45. GRB050915, optical observations
  46. GRB050915: XRT position
  47. GRB 050915: ROTSE-III optical limits
  48. GRB 050915: Swift detection of a GRB
  49. GRB050911: Upper limit on X-ray afterglow
  50. Swift-BAT trigger 155072 ground analysis
  51. Swift-BAT trigger 155072 is probably not a GRB
  52. GRB 050911: LCO limits on a variable source
  53. GRB 050908: DEIMOS spectrum and further analysis
  54. Swift is in normal operation
  55. GRB050911: Swift UVOT followup observations
  56. GRB 050911, optical content of Swift/XRT error box
  57. GRB050911: Swift-XRT position
  58. GRB 050911: LCO observations
  59. GRB 050911, optical observations
  60. GRB 050911: Swift-BAT refined analysis
  61. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  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. GRB050908 : Swift-XRT refined analysis
  72. GRB 050908: Swift-BAT refined analysis
  73. GRB 050908: Optical observations
  74. Gemini Spectroscopy of GRB 050908
  75. GRB 050908: spectroscopic redshift
  76. GRB 050908: Prompt PROMPT Observations
  77. GRB 050908 : Swift XRT position
  78. GRB 050908: KAIT observations
  79. GRB 050908: P60 Confirmation of Optical Afterglow
  80. GRB 050908: Optical Observations
  81. GRB 050908: Swift detection of a burst
  82. GRB 050906: Optical observations at the Very Large Telescope
  83. GRB050904: CrAO optical observations
  84. GRB 050904 BAT refined analysis of complete data set
  85. GRB 050904: Subaru Optical Spectroscopy
  86. GRB 050906: MARGE Optical Limits
  87. GRB 050906: Swift-BAT refined analysis
  88. GRB 050906: Swift XRT upper limit
  89. GRB 050906: Radio Observations
  90. GRB 050904: Keck I-band Imaging
  91. GRB050906: P60 Observations
  92. GRB 050904: more VLT NIR observations
  93. GRB 050904: BOOTES early R-band observation
  94. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  95. GRB 050906: Bright galaxy in BAT error box
  96. GRB 050906: Swift/BAT Detection of a possible burst
  97. GRB 050904: More SOAR
  98. GRB 050904: photometric redshift
  99. GRB 050904: Swift/UVOT observations
  100. GRB 050904: Afterglow Astrometry

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