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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"

23700 results found.

  1. GRB 051016: PROMPT Observations
  2. GRB051006: optical observations
  3. GRB051008: optical candidate
  4. GRB051011: MASTER optical observation
  5. GRB051008: optical observation
  6. GRB051008: Swift XRT refined analysis
  7. GRB051008 - Swift UVOT upper limits
  8. Konus-Wind observation of GRB 051008
  9. GRB051008: Final refined analysis of the Swift-BAT burst
  10. GRB051008: Refined analysis of the Swift-BAT burst
  11. GRB 051008: Swift XRT position
  12. GRB 051008: early Swift XRT analysis
  13. GRB051008: Swift-BAT detection of a bright burst
  14. GRB 051006: P60 Observations
  15. GRB 051006: XRT refined analysis
  16. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  17. GRB 051006: optical observations at Sierra Nevada
  18. GRB051006: Refined analysis of the Swift-BAT burst
  19. GRB 051006: XRT position
  20. GRB051006: Swift detection of a burst
  21. GRB051001: Swift UVOT Upper Limits
  22. GRB 051001: Swift XRT refined analysis
  23. GRB 051001, optical observations at Mt. John
  24. GRB 051001: AAT infra-red observations
  25. GRB 051001: Swift-BAT refined analysis
  26. GRB 051001: Swift Detection of a Burst
  27. GRB050908: optical observations
  28. GRB050922C: optical observation
  29. GRB 050820A: NIR photometry at the TNG
  30. GRB050925: Swift UVOT upper limits
  31. GRB 050925 : I-band observation at Xinglong observatory
  32. GRB050925: Faulkes Telescope North R-band limit
  33. GRB 050922B: Correction to BAT refined analysis, longer burst
  34. GRB050922C: TNG spectroscopic observations
  35. GRB050922B: refined XRT analysis
  36. Konus-Wind observation of GRB 050922C
  37. GRB050922B: Swift UVOT early upper limits.
  38. GRB050922C: observation at MonteBoo
  39. INT 2.5m limit for GRB050922B
  40. GRB050922C: Optical Observations
  41. GRB 050922C: Swift XRT refined analysis
  42. HETE Fregate observations of GRB 050922C
  43. GRB 050922C: Swift-BAT refined analysis
  44. GRB 050922B: Swift-BAT refined analysis
  45. GRB050922C: optical observations
  46. GRB 050922C: optical obserations
  47. GRB 050922C: Swift detection of a bright burst
  48. GRB 050922B,optical observation
  49. Possible GRB 050922 detected by INTEGRAL
  50. GRB 050916: Swift-BAT refined analysis
  51. GRB 050918 - A long GRB detected by INTEGRAL
  52. GRB 050915B: Swift-BAT refined analysis
  53. GRB 050915B: Swift/UVOT Upper Limits
  54. GRB050916: Swift-BAT detection of a long weak burst
  55. GRB 050915b, SMARTS optical/IR observations
  56. GRB 050915: KAIT optical limit
  57. Swift-BAT trigger 155072 is probably not a GRB
  58. GRB 050911: LCO limits on a variable source
  59. GRB 050908: DEIMOS spectrum and further analysis
  60. Swift is in normal operation
  61. GRB050911: Swift UVOT followup observations
  62. GRB 050911, optical content of Swift/XRT error box
  63. GRB 050911, optical observations
  64. GRB 050911: Swift-BAT refined analysis
  65. GRB050911: Swift-BAT detection of a long burst
  66. GRB050908: detection of Swift/UVOT optical counterpart
  67. GRB 050910a: TAROT early optical limits
  68. WIRO observations in I of GRB 050908
  69. GRB 050906: Possible X-ray Counterpart
  70. GRB 050906: RTT150 optical observations
  71. GRB050908: Swift/UVOT Early upper limits
  72. GRB050908 : Swift-XRT refined analysis
  73. GRB 050908: Optical observations
  74. GRB 050908: Prompt PROMPT Observations
  75. GRB 050908 : Swift XRT position
  76. GRB 050908: KAIT observations
  77. GRB 050908: Optical Observations
  78. GRB 050908: Swift detection of a burst
  79. GRB 050906: Optical observations at the Very Large Telescope
  80. GRB050904: CrAO optical observations
  81. GRB 050904 BAT refined analysis of complete data set
  82. GRB 050904: Subaru Optical Spectroscopy
  83. GRB 050904: Keck I-band Imaging
  84. GRB 050904: BOOTES early R-band observation
  85. GRB 050906: Swift/BAT Detection of a possible burst
  86. GRB 050904: Afterglow Astrometry
  87. GRB 050904: NIR object inside the XRT error box
  88. GRB 050904: early Swift XRT analysis results
  89. GRB 050904: SOAR YJ and PROMPT Ic Observations
  90. GRB 050904: BAT refined analysis of partial data set
  91. GRB 050904: TAROT optical measurements
  92. GRB050904: Optical Observations
  93. GRB 050904: Environmental Constraints
  94. GRB 050904: TAROT optical limits
  95. GRB050904: Swift-BAT detection of a probable burst
  96. GRB 050827: Swift XRT preliminary analysis results
  97. GRB 050827 : OSN 1.5m optical observations
  98. GRB050827: Swift/UVOT upper limits
  99. GRB 050827: XRT possible afterglow detection
  100. GRB 050826 : Lulin R band observation

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