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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"

23707 results found.

  1. GRB051021.6: MASTER optical observation
  2. GRB051021: A GRB Localized by HETE
  3. GRB 051016A: Swift/UVOT upper limits
  4. GRB 051016B: Swift/UVOT detection
  5. GRB 051016B : Optical follow-up at Lulin
  6. GRB 051016: Swift-BAT refined analysis
  7. GRB 051016: LCO optical and near-IR imaging
  8. GRB 051016: PROMPT Observations
  9. GRB051006: optical observations
  10. GRB051008: optical candidate
  11. GRB051011: MASTER optical observation
  12. GRB051008: optical observation
  13. GRB051008: Swift XRT refined analysis
  14. GRB051008 - Swift UVOT upper limits
  15. Konus-Wind observation of GRB 051008
  16. GRB051008: Final refined analysis of the Swift-BAT burst
  17. GRB051008: Refined analysis of the Swift-BAT burst
  18. GRB 051008: Swift XRT position
  19. GRB 051008: early Swift XRT analysis
  20. GRB051008: Swift-BAT detection of a bright burst
  21. GRB 051006: P60 Observations
  22. GRB 051006: XRT refined analysis
  23. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  24. GRB 051006: optical observations at Sierra Nevada
  25. GRB051006: Refined analysis of the Swift-BAT burst
  26. GRB 051006: XRT position
  27. GRB051006: Swift detection of a burst
  28. GRB051001: Swift UVOT Upper Limits
  29. GRB 051001: Swift XRT refined analysis
  30. GRB 051001, optical observations at Mt. John
  31. GRB 051001: AAT infra-red observations
  32. GRB 051001: Swift-BAT refined analysis
  33. GRB 051001: Swift Detection of a Burst
  34. GRB050908: optical observations
  35. GRB050922C: optical observation
  36. GRB 050820A: NIR photometry at the TNG
  37. GRB050925: Swift UVOT upper limits
  38. GRB 050925 : I-band observation at Xinglong observatory
  39. GRB050925: Faulkes Telescope North R-band limit
  40. GRB 050922B: Correction to BAT refined analysis, longer burst
  41. GRB050922C: TNG spectroscopic observations
  42. GRB050922B: refined XRT analysis
  43. Konus-Wind observation of GRB 050922C
  44. GRB050922B: Swift UVOT early upper limits.
  45. GRB050922C: observation at MonteBoo
  46. INT 2.5m limit for GRB050922B
  47. GRB050922C: Optical Observations
  48. GRB 050922C: Swift XRT refined analysis
  49. HETE Fregate observations of GRB 050922C
  50. GRB 050922C: Swift-BAT refined analysis
  51. GRB 050922B: Swift-BAT refined analysis
  52. GRB050922C: optical observations
  53. GRB 050922C: optical obserations
  54. GRB 050922C: Swift detection of a bright burst
  55. GRB 050922B,optical observation
  56. Possible GRB 050922 detected by INTEGRAL
  57. GRB 050916: Swift-BAT refined analysis
  58. GRB 050918 - A long GRB detected by INTEGRAL
  59. GRB 050915B: Swift-BAT refined analysis
  60. GRB 050915B: Swift/UVOT Upper Limits
  61. GRB050916: Swift-BAT detection of a long weak burst
  62. GRB 050915b, SMARTS optical/IR observations
  63. GRB 050915: KAIT optical limit
  64. Swift-BAT trigger 155072 is probably not a GRB
  65. GRB 050911: LCO limits on a variable source
  66. GRB 050908: DEIMOS spectrum and further analysis
  67. Swift is in normal operation
  68. GRB050911: Swift UVOT followup observations
  69. GRB 050911, optical content of Swift/XRT error box
  70. GRB 050911, optical observations
  71. GRB 050911: Swift-BAT refined analysis
  72. GRB050911: Swift-BAT detection of a long burst
  73. GRB050908: detection of Swift/UVOT optical counterpart
  74. GRB 050910a: TAROT early optical limits
  75. WIRO observations in I of GRB 050908
  76. GRB 050906: Possible X-ray Counterpart
  77. GRB 050906: RTT150 optical observations
  78. GRB050908: Swift/UVOT Early upper limits
  79. GRB050908 : Swift-XRT refined analysis
  80. GRB 050908: Optical observations
  81. GRB 050908: Prompt PROMPT Observations
  82. GRB 050908 : Swift XRT position
  83. GRB 050908: KAIT observations
  84. GRB 050908: Optical Observations
  85. GRB 050908: Swift detection of a burst
  86. GRB 050906: Optical observations at the Very Large Telescope
  87. GRB050904: CrAO optical observations
  88. GRB 050904 BAT refined analysis of complete data set
  89. GRB 050904: Subaru Optical Spectroscopy
  90. GRB 050904: Keck I-band Imaging
  91. GRB 050904: BOOTES early R-band observation
  92. GRB 050906: Swift/BAT Detection of a possible burst
  93. GRB 050904: Afterglow Astrometry
  94. GRB 050904: NIR object inside the XRT error box
  95. GRB 050904: early Swift XRT analysis results
  96. GRB 050904: SOAR YJ and PROMPT Ic Observations
  97. GRB 050904: BAT refined analysis of partial data set
  98. GRB 050904: TAROT optical measurements
  99. GRB050904: Optical Observations
  100. GRB 050904: Environmental Constraints

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