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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"

19353 results found.

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

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