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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"

42884 results found.

  1. Konus-Wind observation of GRB 051008
  2. GRB051008: Final refined analysis of the Swift-BAT burst
  3. GRB051008: Refined analysis of the Swift-BAT burst
  4. GRB051008: Radio Observation
  5. GRB 051008: Swift XRT position
  6. GRB 051008, optical observations
  7. GRB 051008: early Swift XRT analysis
  8. GRB 051008: Swift UVOT Candidate
  9. GRB051008: Swift-BAT detection of a bright burst
  10. GRB 051006: P60 Observations
  11. grb test
  12. GRB 051006: XRT refined analysis
  13. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  14. GRB 051006: optical observations at Sierra Nevada
  15. GRB051006: Refined analysis of the Swift-BAT burst
  16. GRB 051006: XRT position
  17. GRB051006: Swift detection of a burst
  18. GRB 050906, summary of radio observations
  19. Swift-BAT triggers 158261 and 158262 Retraction
  20. GRB051001: Swift UVOT Upper Limits
  21. GRB 050925: Second Epoch WSRT Radio Observations
  22. GRB 051001: Swift XRT refined analysis
  23. GRB 051001, optical observations at Mt. John
  24. GRB 051001: I-band limit
  25. GRB 051001: AAT infra-red observations
  26. GRB 051001: Swift-BAT refined analysis
  27. GRB 051001: Swift Detection of a Burst
  28. GRB050908: optical observations
  29. GRB050922C: optical observation
  30. GRB050922B: optical limit
  31. GRB 050922C: further VLT observations
  32. GRB 050820A: NIR photometry at the TNG
  33. GRB050922C: UVES/VLT high resolution spectroscopy
  34. GRB050925: Swift/XRT limits
  35. GRB/SGR 050925: IR Observations
  36. GRB050922C - Swift UVOT preliminary analysis
  37. GRB 050922C: break in the lightcurve
  38. GRB 050925: WSRT Radio Observations
  39. GRB050925: Swift UVOT upper limits
  40. Refined analysis of the Swift-BAT soft short burst
  41. GRB050925: Faulkes Telescope North R-band limit
  42. GRB050925: Swift-BAT detection of a short burst
  43. GRB 050922B: Correction to BAT refined analysis, longer burst
  44. GRB050922C: TNG spectroscopic observations
  45. GRB050922B: refined XRT analysis
  46. Konus-Wind observation of GRB 050922C
  47. GRB 050922C: Refined redshift
  48. GRB050922B: Swift UVOT early upper limits.
  49. GRB OT observation
  50. GRB050922C: observation at MonteBoo
  51. INT 2.5m limit for GRB050922B
  52. GRB050922C: Optical Observations
  53. GRB 050922C: Swift XRT refined analysis
  54. HETE Fregate observations of GRB 050922C
  55. GRB 050922C: Swift-BAT refined analysis
  56. GRB 050922B: Swift-BAT refined analysis
  57. GRB050922C: optical observations
  58. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  59. GRB 050922C: optical obserations
  60. GRB 050922C: NOT optical observations
  61. GRB 050922A: Analysis of Swift/XRT TOO observation
  62. GRB 050922C: Swift detection of a bright burst
  63. GRB 050922C: ROTSE-IIId Refined Analysis
  64. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  65. GRB 050922B,optical observation
  66. GRB050922B: Swift-BAT detection of a weak long burst
  67. Possible GRB 050922 detected by INTEGRAL
  68. GRB050918: Possible Swift/XRT detected afterglow
  69. GRB050820B: analysis of the XMM-Newton observation
  70. GRB050916: Swift/UVOT Upper Limits
  71. GRB 050916: Swift-BAT refined analysis
  72. GRB 050918 - A long GRB detected by INTEGRAL
  73. GRB 050915a: Radio Observations
  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. GRB050916 : Swift-XRT refined analysis
  79. GRB 050916: XRT position
  80. GRB 050915b, SMARTS optical/IR observations of the XRT position
  81. GRB 050915B: Swift-BAT refined analysis
  82. GRB 050915B: Swift/UVOT Upper Limits
  83. GRB050916: Swift-BAT detection of a long weak burst
  84. GRB 050915a: IR Transient
  85. GRB 050915B: XRT position
  86. GRB 050915b, SMARTS optical/IR observations
  87. GRB050915B: Swift-BAT detection of a long bright burst
  88. GRB050915: Swift/UVOT upper limits
  89. GRB 050915: KAIT optical limit
  90. GRB 050915: IR Observations
  91. GRB 050915: Swift XRT refined analysis
  92. GRB 050915: Swift-BAT refined analysis
  93. GRB050915: P60 Optical Observations
  94. GRB050915, optical observations
  95. GRB050915: XRT position
  96. GRB 050915: Swift detection of a GRB
  97. GRB050911: Upper limit on X-ray afterglow
  98. Swift-BAT trigger 155072 ground analysis
  99. Swift-BAT trigger 155072 is probably not a GRB
  100. GRB050914: XRT position probably due to cosmic ray

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