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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"

19361 results found.

  1. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  2. GRB051109: Swift detection of a burst
  3. GRB 051109a: IR Detections
  4. GRB 051109: ROTSE-III Detection of Possible Counterpart
  5. GRB051105B: Swift/XRT upper limit
  6. GRB051105B: Swift/UVOT upper limit
  7. GRB051028: Swift-XRT refined analysis
  8. GRB 051105a: MDM Observations
  9. GRB051105A: Swift/UVOT Observations
  10. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  11. XRT observations of GRB 051105A
  12. GRB 051105: Swift-BAT improved refined analysis
  13. GRB 051105: Swift-BAT refined analysis
  14. GRB 051105: Swift detection of a short burst
  15. GRB051028: Swift/UVOT upper limits
  16. GRB051028: Swift XRT Position
  17. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  18. GRB051022: Swift XRT measurement of jet break
  19. GRB051021B: Swift/UVOT Upper limits
  20. GRB 051022: XRT Refined Spectral and Temporal Analysis
  21. GRB051012: Swift-XRT analysis
  22. GRB051021B: Swift XRT refined analysis
  23. GRB 051022: WSRT Radio Detection
  24. GRB 051022: Swift/UVOT Upper Limits
  25. GRB051021A: Swift XRT refined analysis
  26. GRB051022: Optical Observations
  27. GRB 051022, J & K-band observation
  28. GRB051022: Swift XRT Position
  29. GRB051021: Swift/UVOT Upper Limits
  30. GRB 051021B: Refined analysis of the Swift-BAT burst
  31. GRB051021B: Swift XRT Position
  32. GRB 051021B: Swift detection of a burst
  33. GRB051021: Swift XRT analysis
  34. GRB051021.63
  35. Swift-BAT trigger 160640 is not a real GRB
  36. Swift-BAT trigger 160619 is not a GRB
  37. Swift-BAT triggered on a posible CR Shower or possible GRB
  38. GRB 051016A: Swift/UVOT upper limits
  39. GRB 051016B: refined analysis of the Swift/XRT data
  40. GRB 051016B: Swift/UVOT detection
  41. GRB 051016B : Optical follow-up at Lulin
  42. GRB 051016B: Refined analysis of the Swift-BAT burst
  43. GRB 051016B: Swift detection of a soft burst
  44. GRB 051016: Swift-BAT refined analysis
  45. GRB051016 XMM-Newton observation
  46. GRB051016: Swift XRT refined analysis.
  47. GRB051016: Swift detection of a burst
  48. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  49. GRB 051012: Swift-BAT detection of burst yesterday
  50. Swift trigger 159578 is not a burst
  51. Swift-BAT Trigger 159578 is a possible burst
  52. GRB050805A: Rc optical observations
  53. GRB 051006: Swift/UVOT Upper Limits
  54. GRB 051008 - a low redshift low-luminosity burst?
  55. GRB051008: Swift XRT refined analysis
  56. GRB051008 - Swift UVOT upper limits
  57. Konus-Wind observation of GRB 051008
  58. GRB051008: Final refined analysis of the Swift-BAT burst
  59. GRB 051008: R-band upper limit
  60. GRB051008: Refined analysis of the Swift-BAT burst
  61. GRB 051008: Swift XRT position
  62. GRB 051008: early Swift XRT analysis
  63. GRB 051008: Swift UVOT Candidate
  64. GRB051008: Swift-BAT detection of a bright burst
  65. GRB 051006: XRT refined analysis
  66. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  67. GRB 051006: optical observations at Sierra Nevada
  68. GRB051006: Refined analysis of the Swift-BAT burst
  69. GRB 051006: XRT position
  70. GRB051006: Swift detection of a burst
  71. Swift-BAT triggers 158261 and 158262 Retraction
  72. GRB051001: Swift UVOT Upper Limits
  73. GRB 050925: Second Epoch WSRT Radio Observations
  74. GRB 051001: Swift XRT refined analysis
  75. GRB 051001, optical observations at Mt. John
  76. GRB 051001: I-band limit
  77. GRB 051001: Swift-BAT refined analysis
  78. GRB 051001: Swift Detection of a Burst
  79. GRB 051001: ROTSE-III Optical Limits
  80. GRB050922B: optical limit
  81. GRB050925: Swift/XRT limits
  82. GRB/SGR 050925: IR Observations
  83. GRB050922C - Swift UVOT preliminary analysis
  84. GRB 050925: WSRT Radio Observations
  85. GRB050925: Swift UVOT upper limits
  86. Refined analysis of the Swift-BAT soft short burst
  87. GRB050925: Faulkes Telescope North R-band limit
  88. GRB050925: Swift-BAT detection of a short burst
  89. GRB 050922B: Correction to BAT refined analysis, longer burst
  90. GRB050922B: refined XRT analysis
  91. Konus-Wind observation of GRB 050922C
  92. GRB050922B: Swift UVOT early upper limits.
  93. GRB 050922B: optical limit
  94. GRB 050922C: Swift XRT refined analysis
  95. HETE Fregate observations of GRB 050922C
  96. GRB 050922C: Swift-BAT refined analysis
  97. GRB 050922B: Swift-BAT refined analysis
  98. GRB050922C: optical observations
  99. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  100. GRB 050922C: optical obserations

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