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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"

19268 results found.

  1. GRB051109A: further steepening in the X-ray light curve
  2. GRB051109A: XRT refined analysis
  3. GRB051109B: XRT position
  4. GRB 051109B: Super-LOTIS Observations
  5. GRB 051109B Kiso optical follow-up observation
  6. GRB 051109B: Swift detection of a burst
  7. GRB051109: Early Super-LOTIS Detection
  8. GRB 051109: Swift-BAT refined analysis
  9. GRB 051109a: MDM Observations
  10. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  11. GRB051109: Swift detection of a burst
  12. GRB 051109a: IR Detections
  13. GRB 051109: ROTSE-III Detection of Possible Counterpart
  14. GRB051105B: Swift/XRT upper limit
  15. GRB051105B: Swift/UVOT upper limit
  16. GRB051028: Swift-XRT refined analysis
  17. GRB 051105a: MDM Observations
  18. GRB051105A: Swift/UVOT Observations
  19. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  20. XRT observations of GRB 051105A
  21. GRB 051105: Swift-BAT improved refined analysis
  22. GRB 051105: Swift-BAT refined analysis
  23. GRB 051105: Swift detection of a short burst
  24. GRB051028: Swift/UVOT upper limits
  25. GRB051028: Swift XRT Position
  26. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  27. GRB051022: Swift XRT measurement of jet break
  28. GRB051021B: Swift/UVOT Upper limits
  29. GRB 051022: XRT Refined Spectral and Temporal Analysis
  30. GRB051012: Swift-XRT analysis
  31. GRB051021B: Swift XRT refined analysis
  32. GRB 051022: WSRT Radio Detection
  33. GRB 051022: Swift/UVOT Upper Limits
  34. GRB051021A: Swift XRT refined analysis
  35. GRB051022: Optical Observations
  36. GRB 051022, J & K-band observation
  37. GRB051022: Swift XRT Position
  38. GRB051021: Swift/UVOT Upper Limits
  39. GRB 051021B: Refined analysis of the Swift-BAT burst
  40. GRB051021B: Swift XRT Position
  41. GRB 051021B: Swift detection of a burst
  42. GRB051021: Swift XRT analysis
  43. GRB051021.63
  44. Swift-BAT trigger 160640 is not a real GRB
  45. Swift-BAT trigger 160619 is not a GRB
  46. Swift-BAT triggered on a posible CR Shower or possible GRB
  47. GRB 051016A: Swift/UVOT upper limits
  48. GRB 051016B: refined analysis of the Swift/XRT data
  49. GRB 051016B: Swift/UVOT detection
  50. GRB 051016B : Optical follow-up at Lulin
  51. GRB 051016B: Refined analysis of the Swift-BAT burst
  52. GRB 051016B: Swift detection of a soft burst
  53. GRB 051016: Swift-BAT refined analysis
  54. GRB051016 XMM-Newton observation
  55. GRB051016: Swift XRT refined analysis.
  56. GRB051016: Swift detection of a burst
  57. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  58. GRB 051012: Swift-BAT detection of burst yesterday
  59. Swift trigger 159578 is not a burst
  60. Swift-BAT Trigger 159578 is a possible burst
  61. GRB050805A: Rc optical observations
  62. GRB 051006: Swift/UVOT Upper Limits
  63. GRB 051008 - a low redshift low-luminosity burst?
  64. GRB051008: Swift XRT refined analysis
  65. GRB051008 - Swift UVOT upper limits
  66. Konus-Wind observation of GRB 051008
  67. GRB051008: Final refined analysis of the Swift-BAT burst
  68. GRB 051008: R-band upper limit
  69. GRB051008: Refined analysis of the Swift-BAT burst
  70. GRB 051008: Swift XRT position
  71. GRB 051008: early Swift XRT analysis
  72. GRB 051008: Swift UVOT Candidate
  73. GRB051008: Swift-BAT detection of a bright burst
  74. GRB 051006: XRT refined analysis
  75. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  76. GRB 051006: optical observations at Sierra Nevada
  77. GRB051006: Refined analysis of the Swift-BAT burst
  78. GRB 051006: XRT position
  79. GRB051006: Swift detection of a burst
  80. Swift-BAT triggers 158261 and 158262 Retraction
  81. GRB051001: Swift UVOT Upper Limits
  82. GRB 050925: Second Epoch WSRT Radio Observations
  83. GRB 051001: Swift XRT refined analysis
  84. GRB 051001, optical observations at Mt. John
  85. GRB 051001: I-band limit
  86. GRB 051001: Swift-BAT refined analysis
  87. GRB 051001: Swift Detection of a Burst
  88. GRB 051001: ROTSE-III Optical Limits
  89. GRB050922B: optical limit
  90. GRB050925: Swift/XRT limits
  91. GRB/SGR 050925: IR Observations
  92. GRB050922C - Swift UVOT preliminary analysis
  93. GRB 050925: WSRT Radio Observations
  94. GRB050925: Swift UVOT upper limits
  95. Refined analysis of the Swift-BAT soft short burst
  96. GRB050925: Faulkes Telescope North R-band limit
  97. GRB050925: Swift-BAT detection of a short burst
  98. GRB 050922B: Correction to BAT refined analysis, longer burst
  99. GRB050922B: refined XRT analysis
  100. Konus-Wind observation of GRB 050922C

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