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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19531 results found.

  1. GRB051021: Swift/UVOT Upper Limits
  2. GRB 051021B: Refined analysis of the Swift-BAT burst
  3. GRB051021B: Swift XRT Position
  4. GRB 051021B: Swift detection of a burst
  5. GRB051021: Swift XRT analysis
  6. GRB051021.63
  7. Swift-BAT trigger 160640 is not a real GRB
  8. Swift-BAT trigger 160619 is not a GRB
  9. Swift-BAT triggered on a posible CR Shower or possible GRB
  10. GRB 051016A: Swift/UVOT upper limits
  11. GRB 051016B: refined analysis of the Swift/XRT data
  12. GRB 051016B: Swift/UVOT detection
  13. GRB 051016B : Optical follow-up at Lulin
  14. GRB 051016B: Refined analysis of the Swift-BAT burst
  15. GRB 051016B: Swift detection of a soft burst
  16. GRB 051016: Swift-BAT refined analysis
  17. GRB051016 XMM-Newton observation
  18. GRB051016: Swift XRT refined analysis.
  19. GRB051016: Swift detection of a burst
  20. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  21. GRB 051012: Swift-BAT detection of burst yesterday
  22. Swift trigger 159578 is not a burst
  23. Swift-BAT Trigger 159578 is a possible burst
  24. GRB050805A: Rc optical observations
  25. GRB 051006: Swift/UVOT Upper Limits
  26. GRB 051008 - a low redshift low-luminosity burst?
  27. GRB051008: Swift XRT refined analysis
  28. GRB051008 - Swift UVOT upper limits
  29. Konus-Wind observation of GRB 051008
  30. GRB051008: Final refined analysis of the Swift-BAT burst
  31. GRB 051008: R-band upper limit
  32. GRB051008: Refined analysis of the Swift-BAT burst
  33. GRB 051008: Swift XRT position
  34. GRB 051008: early Swift XRT analysis
  35. GRB 051008: Swift UVOT Candidate
  36. GRB051008: Swift-BAT detection of a bright burst
  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. GRB 051006: XRT position
  42. GRB051006: Swift detection of a burst
  43. Swift-BAT triggers 158261 and 158262 Retraction
  44. GRB051001: Swift UVOT Upper Limits
  45. GRB 050925: Second Epoch WSRT Radio Observations
  46. GRB 051001: Swift XRT refined analysis
  47. GRB 051001, optical observations at Mt. John
  48. GRB 051001: I-band limit
  49. GRB 051001: Swift-BAT refined analysis
  50. GRB 051001: Swift Detection of a Burst
  51. GRB 051001: ROTSE-III Optical Limits
  52. GRB050922B: optical limit
  53. GRB050925: Swift/XRT limits
  54. GRB/SGR 050925: IR Observations
  55. GRB050922C - Swift UVOT preliminary analysis
  56. GRB 050925: WSRT Radio Observations
  57. GRB050925: Swift UVOT upper limits
  58. Refined analysis of the Swift-BAT soft short burst
  59. GRB050925: Faulkes Telescope North R-band limit
  60. GRB050925: Swift-BAT detection of a short burst
  61. GRB 050922B: Correction to BAT refined analysis, longer burst
  62. GRB050922B: refined XRT analysis
  63. Konus-Wind observation of GRB 050922C
  64. GRB050922B: Swift UVOT early upper limits.
  65. GRB 050922B: optical limit
  66. GRB 050922C: Swift XRT refined analysis
  67. HETE Fregate observations of GRB 050922C
  68. GRB 050922C: Swift-BAT refined analysis
  69. GRB 050922B: Swift-BAT refined analysis
  70. GRB050922C: optical observations
  71. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  72. GRB 050922C: optical obserations
  73. GRB 050922C: NOT optical observations
  74. GRB 050922A: Analysis of Swift/XRT TOO observation
  75. GRB 050922C: Swift detection of a bright burst
  76. GRB 050922C: ROTSE-IIId Refined Analysis
  77. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  78. GRB 050922B: ROTSE-III Optical Limits
  79. GRB 050922B,optical observation
  80. GRB050922B: Swift-BAT detection of a weak long burst
  81. GRB050918: Possible Swift/XRT detected afterglow
  82. GRB050820B: analysis of the XMM-Newton observation
  83. GRB050916: Swift/UVOT Upper Limits
  84. GRB 050916: Swift-BAT refined analysis
  85. Swift-BAT trigger 155764 is not a GRB
  86. Swift-BAT trigger 155764 is probably not a GRB
  87. Swift trigger 155764: bad XRT centroid
  88. Swift-BAT trigger 155535 is definitely not a GRB
  89. GRB050916 : Swift-XRT refined analysis
  90. GRB 050916: XRT position
  91. GRB 050915B: Swift-BAT refined analysis
  92. GRB 050915B: Swift/UVOT Upper Limits
  93. GRB050916: Swift-BAT detection of a long weak burst
  94. GRB 050915B: XRT position
  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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