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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"

26559 results found.

  1. GRB 051021B: Refined analysis of the Swift-BAT burst
  2. GRB 051022: SSO40 Optical Observations
  3. GRB051022,optical observation
  4. GRB 051022: Optical observations
  5. GRB 051021,optical observation
  6. GRB051021B: Swift XRT Position
  7. GRB 051021B: Swift detection of a burst
  8. GRB051021: Swift XRT analysis
  9. GRB051021 (=H3947): Refined Analysis
  10. Swift-BAT triggered on a posible CR Shower or possible GRB
  11. GRB 050502b: Optical limit
  12. Afterglow candidate of GRB 051016B observed at Lulin
  13. GRB 051016A: Swift/UVOT upper limits
  14. GRB 051016B: refined analysis of the Swift/XRT data
  15. GRB 051016B: Swift/UVOT detection
  16. GRB 051016B,optical observation
  17. GRB 051016B : Optical follow-up at Lulin
  18. GRB 051016B: Refined analysis of the Swift-BAT burst
  19. GRB 051016B: Swift detection of a soft burst
  20. GRB051016 XMM-Newton observation
  21. GRB051016: Swift XRT refined analysis.
  22. GRB 051016: PROMPT Observations
  23. GRB051016: Swift detection of a burst
  24. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  25. GRB 051012: Swift-BAT detection of burst yesterday
  26. Swift-BAT Trigger 159578 is a possible burst
  27. GRB 051006: Swift/UVOT Upper Limits
  28. GRB051008: optical candidate
  29. GRB051008: Swift XRT refined analysis
  30. GRB051008: Final refined analysis of the Swift-BAT burst
  31. GRB051008: Radio Observation
  32. GRB 051008: Swift XRT position
  33. GRB 051008, optical observations
  34. GRB 051008: early Swift XRT analysis
  35. GRB 051008: Swift UVOT Candidate
  36. GRB 051006: P60 Observations
  37. GRB 051006: XRT refined analysis
  38. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  39. GRB 051006: optical observations at Sierra Nevada
  40. GRB051006: Refined analysis of the Swift-BAT burst
  41. GRB051006: Swift detection of a burst
  42. GRB 050906, summary of radio observations
  43. GRB051001: Swift UVOT Upper Limits
  44. GRB 050925: Second Epoch WSRT Radio Observations
  45. GRB 051001: Swift XRT refined analysis
  46. GRB 051001: AAT infra-red observations
  47. GRB 051001: Swift Detection of a Burst
  48. GRB 050820A: NIR photometry at the TNG
  49. GRB050922C: UVES/VLT high resolution spectroscopy
  50. GRB050925: Swift/XRT limits
  51. GRB/SGR 050925: IR Observations
  52. GRB050925: Swift UVOT upper limits
  53. Refined analysis of the Swift-BAT soft short burst
  54. GRB050925: Faulkes Telescope North R-band limit
  55. GRB050925: Swift-BAT detection of a short burst
  56. GRB 050922B: Correction to BAT refined analysis, longer burst
  57. GRB050922B: refined XRT analysis
  58. Konus-Wind observation of GRB 050922C
  59. GRB050922B: Swift UVOT early upper limits.
  60. GRB050922C: Optical Observations
  61. GRB 050922C: Swift XRT refined analysis
  62. HETE Fregate observations of GRB 050922C
  63. GRB 050922C: optical obserations
  64. GRB 050922C: NOT optical observations
  65. GRB 050922C: Swift detection of a bright burst
  66. GRB 050922B: ROTSE-III Optical Limits
  67. GRB 050922B,optical observation
  68. GRB050922B: Swift-BAT detection of a weak long burst
  69. Possible GRB 050922 detected by INTEGRAL
  70. GRB050918: Possible Swift/XRT detected afterglow
  71. GRB050820B: analysis of the XMM-Newton observation
  72. GRB050916: Swift/UVOT Upper Limits
  73. GRB 050916: Swift-BAT refined analysis
  74. Swift-BAT trigger 155764 is not a GRB
  75. Swift-BAT trigger 155764 is probably not a GRB
  76. Swift trigger 155764: bad XRT centroid
  77. Swift-BAT trigger 155535 is definitely not a GRB
  78. GRB 050915B: Swift/UVOT Upper Limits
  79. GRB 050915a: IR Transient
  80. GRB 050915b, SMARTS optical/IR observations
  81. GRB050915B: Swift-BAT detection of a long bright burst
  82. GRB050915: Swift/UVOT upper limits
  83. GRB 050915: IR Observations
  84. GRB 050915: Swift XRT refined analysis
  85. GRB 050915: Swift-BAT refined analysis
  86. GRB 050915: Swift detection of a GRB
  87. GRB050911: Upper limit on X-ray afterglow
  88. Swift-BAT trigger 155072 ground analysis
  89. Swift-BAT trigger 155072 is probably not a GRB
  90. GRB 050911, optical content of Swift/XRT error box
  91. GRB 050911, optical observations
  92. GRB 050911: Swift-BAT refined analysis
  93. GRB 050911: z~0.16 cluster in the field
  94. GRB050911: Swift-BAT detection of a long burst
  95. GRB 050910a: TAROT early optical limits
  96. RBO GRB 050908 observations
  97. WIRO observations in I of GRB 050908
  98. GRB 050906: Possible X-ray Counterpart
  99. GRB050908: Swift/UVOT Early upper limits
  100. GRB050908 : Swift-XRT refined analysis

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