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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"

45522 results found.

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

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