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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"

37939 results found.

  1. GRB051008: optical observation
  2. GRB051008: Swift XRT refined analysis
  3. GRB051008 - Swift UVOT upper limits
  4. Konus-Wind observation of GRB 051008
  5. GRB051008: Final refined analysis of the Swift-BAT burst
  6. GRB 051008: R-band upper limit
  7. GRB051008: Refined analysis of the Swift-BAT burst
  8. GRB051008: Radio Observation
  9. GRB 051008: Swift XRT position
  10. GRB 051008, optical observations
  11. GRB 051008: early Swift XRT analysis
  12. GRB 051008: Swift UVOT Candidate
  13. GRB051008: Swift-BAT detection of a bright burst
  14. GRB 051006: P60 Observations
  15. grb test
  16. GRB 051006: XRT refined analysis
  17. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  18. GRB 051006: optical observations at Sierra Nevada
  19. GRB051006: Refined analysis of the Swift-BAT burst
  20. GRB 051006: XRT position
  21. GRB051006: Swift detection of a burst
  22. GRB 050906, summary of radio observations
  23. Swift-BAT triggers 158261 and 158262 Retraction
  24. GRB051001: Swift UVOT Upper Limits
  25. GRB 050925: Second Epoch WSRT Radio Observations
  26. GRB 051001: Swift XRT refined analysis
  27. GRB 051001, optical observations at Mt. John
  28. GRB 051001: I-band limit
  29. GRB 051001: AAT infra-red observations
  30. GRB 051001: Swift-BAT refined analysis
  31. GRB 051001: Swift Detection of a Burst
  32. GRB 051001: ROTSE-III Optical Limits
  33. GRB050908: optical observations
  34. GRB050922C: optical observation
  35. GRB050922B: optical limit
  36. GRB 050922C: further VLT observations
  37. GRB 050820A: NIR photometry at the TNG
  38. GRB050922C: UVES/VLT high resolution spectroscopy
  39. GRB050925: Swift/XRT limits
  40. GRB/SGR 050925: IR Observations
  41. GRB050922C - Swift UVOT preliminary analysis
  42. GRB 050922C: break in the lightcurve
  43. GRB 050925: WSRT Radio Observations
  44. GRB050925: Swift UVOT upper limits
  45. Refined analysis of the Swift-BAT soft short burst
  46. GRB 050925 : I-band observation at Xinglong observatory
  47. GRB050925: Faulkes Telescope North R-band limit
  48. GRB050925: Swift-BAT detection of a short burst
  49. GRB 050922B: Correction to BAT refined analysis, longer burst
  50. GRB050922C: TNG spectroscopic observations
  51. GRB050922B: refined XRT analysis
  52. Konus-Wind observation of GRB 050922C
  53. GRB 050922C: Refined redshift
  54. GRB050922B: Swift UVOT early upper limits.
  55. GRB OT observation
  56. GRB050922C: observation at MonteBoo
  57. INT 2.5m limit for GRB050922B
  58. GRB 050922B: optical limit
  59. GRB050922C: Optical Observations
  60. GRB 050922C: Swift XRT refined analysis
  61. HETE Fregate observations of GRB 050922C
  62. GRB 050922C: Swift-BAT refined analysis
  63. GRB 050922B: Swift-BAT refined analysis
  64. GRB050922C: optical observations
  65. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  66. GRB 050922C: optical obserations
  67. GRB 050922C: NOT optical observations
  68. GRB 050922A: Analysis of Swift/XRT TOO observation
  69. GRB 050922C: Swift detection of a bright burst
  70. GRB 050922C: ROTSE-IIId Refined Analysis
  71. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  72. GRB 050922B: ROTSE-III Optical Limits
  73. GRB 050922B,optical observation
  74. GRB050922B: Swift-BAT detection of a weak long burst
  75. Possible GRB 050922 detected by INTEGRAL
  76. GRB050918: Possible Swift/XRT detected afterglow
  77. GRB050820B: analysis of the XMM-Newton observation
  78. GRB050916: Swift/UVOT Upper Limits
  79. GRB 050916: Swift-BAT refined analysis
  80. GRB 050918 - A long GRB detected by INTEGRAL
  81. GRB 050915a: Radio Observations
  82. Swift-BAT trigger 155764 is not a GRB
  83. Swift-BAT trigger 155764 is probably not a GRB
  84. Swift trigger 155764: bad XRT centroid
  85. Swift-BAT trigger 155535 is definitely not a GRB
  86. GRB050916 : Swift-XRT refined analysis
  87. GRB 050916: XRT position
  88. GRB 050915b, SMARTS optical/IR observations of the XRT position
  89. GRB 050915B: Swift-BAT refined analysis
  90. GRB 050915B: Swift/UVOT Upper Limits
  91. GRB050916: Swift-BAT detection of a long weak burst
  92. GRB 050915a: IR Transient
  93. GRB 050915B: XRT position
  94. GRB 050915b, SMARTS optical/IR observations
  95. GRB050915B: Swift-BAT detection of a long bright burst
  96. GRB050915: Swift/UVOT upper limits
  97. GRB 050915: KAIT optical limit
  98. GRB 050915: IR Observations
  99. GRB 050915: Swift XRT refined analysis
  100. GRB 050915: Swift-BAT refined analysis

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