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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"

27289 results found.

  1. GRB051111a: SARA Observations
  2. GRB 051111A: KAIT optical observations
  3. GRB051111: Super-LOTIS Early Detection
  4. GRB 051111: ROTSE-III Analysis of Prompt Counterpart
  5. Faulkes Telescope R-band detection of GRB051111
  6. GRB051111: Swift-BAT detection of a bright burst
  7. GRB 051111A: ROTSE-III Detection of Possible Counterpart
  8. GRB051109A - radio observations
  9. Early RAPTOR measurements of GRB 051109a - the movie.
  10. Konus-Wind observation of GRB 051109A
  11. GRB 051109B: Swift-BAT refined analysis
  12. GRB 051109B: ROTSE-III Optical Limits
  13. GRB 051109A: Swift-UVOT Observations
  14. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  15. GRB051109B: no UVOT source detected
  16. GRB051109B: XRT refined analysis
  17. GRB 051109B : Lulin Optical Observations
  18. GRB051109A: further steepening in the X-ray light curve
  19. GRB051109A: XRT refined analysis
  20. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  21. GRB051109B: XRT position
  22. GRB 051109B: Super-LOTIS Observations
  23. GRB 051109B Kiso optical follow-up observation
  24. GRB 051109B: Swift detection of a burst
  25. GRB051109: Early Super-LOTIS Detection
  26. GRB 051109: Swift-BAT refined analysis
  27. GRB 051109a: MDM Observations
  28. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  29. GRB051109: Swift detection of a burst
  30. GRB 051109a: IR Detections
  31. GRB 051109: ROTSE-III Detection of Possible Counterpart
  32. GRB051105B: Swift/XRT upper limit
  33. GRB051105B: Swift/UVOT upper limit
  34. GRB051028: Swift-XRT refined analysis
  35. GRB 051105A, 2nd epoch optical observations
  36. GRB 051105a: MDM Observations
  37. GRB 051105A: TNG optical observations
  38. GRB051105A: Swift/UVOT Observations
  39. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  40. XRT observations of GRB 051105A
  41. GRB 051105: Swift-BAT improved refined analysis
  42. GRB 051105: Swift-BAT refined analysis
  43. GRB 051105: Swift detection of a short burst
  44. GRB051028: Swift/UVOT upper limits
  45. GRB051028: Swift XRT Position
  46. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  47. GRB051022: Swift XRT measurement of jet break
  48. GRB051021B: Swift/UVOT Upper limits
  49. GRB 051022: XRT Refined Spectral and Temporal Analysis
  50. GRB051012: Swift-XRT analysis
  51. GRB051021B: Swift XRT refined analysis
  52. GRB 051022: WSRT Radio Detection
  53. GRB 051022: Swift/UVOT Upper Limits
  54. GRB051021A: Swift XRT refined analysis
  55. GRB051022: Optical Observations
  56. GRB051021b: Magellan IR Imaging
  57. GRB 051022, J & K-band observation
  58. GRB 051021, SMARTS optical/IR observations
  59. GRB051022: Swift XRT Position
  60. GRB 051021: P200 Ks Observations
  61. GRB 051021: MDM Upper Limit
  62. GRB051021: Swift/UVOT Upper Limits
  63. GRB 051021B: Refined analysis of the Swift-BAT burst
  64. GRB051021B: Swift XRT Position
  65. GRB 051021B: Swift detection of a burst
  66. GRB051021: Swift XRT analysis
  67. GRB051021.63
  68. Swift-BAT trigger 160640 is not a real GRB
  69. Swift-BAT trigger 160619 is not a GRB
  70. Swift-BAT triggered on a posible CR Shower or possible GRB
  71. GRB 051016A: Swift/UVOT upper limits
  72. GRB 051016B: refined analysis of the Swift/XRT data
  73. GRB 051016B: Swift/UVOT detection
  74. GRB 051016B : Optical follow-up at Lulin
  75. GRB 051016B: Refined analysis of the Swift-BAT burst
  76. GRB 051016B: Swift detection of a soft burst
  77. GRB 051016: Swift-BAT refined analysis
  78. GRB051016 XMM-Newton observation
  79. GRB051016: Swift XRT refined analysis.
  80. GRB051016: Swift detection of a burst
  81. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  82. GRB 051012: Swift-BAT detection of burst yesterday
  83. Swift trigger 159578 is not a burst
  84. Swift-BAT Trigger 159578 is a possible burst
  85. GRB050805A: Rc optical observations
  86. GRB 051006: Swift/UVOT Upper Limits
  87. GRB 051008 - a low redshift low-luminosity burst?
  88. GRB051008: Swift XRT refined analysis
  89. GRB051008 - Swift UVOT upper limits
  90. Konus-Wind observation of GRB 051008
  91. GRB051008: Final refined analysis of the Swift-BAT burst
  92. GRB 051008: R-band upper limit
  93. GRB051008: Refined analysis of the Swift-BAT burst
  94. GRB 051008: Swift XRT position
  95. GRB 051008: early Swift XRT analysis
  96. GRB 051008: Swift UVOT Candidate
  97. GRB051008: Swift-BAT detection of a bright burst
  98. GRB 051006: XRT refined analysis
  99. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  100. GRB 051006: optical observations at Sierra Nevada

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