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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"

19555 results found.

  1. GRB051021.63
  2. Swift-BAT trigger 160640 is not a real GRB
  3. Swift-BAT trigger 160619 is not a GRB
  4. Swift-BAT triggered on a posible CR Shower or possible GRB
  5. GRB 051016A: Swift/UVOT upper limits
  6. GRB 051016B: refined analysis of the Swift/XRT data
  7. GRB 051016B: Swift/UVOT detection
  8. GRB 051016B : Optical follow-up at Lulin
  9. GRB 051016B: Refined analysis of the Swift-BAT burst
  10. GRB 051016B: Swift detection of a soft burst
  11. GRB 051016: Swift-BAT refined analysis
  12. GRB051016 XMM-Newton observation
  13. GRB051016: Swift XRT refined analysis.
  14. GRB051016: Swift detection of a burst
  15. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  16. GRB 051012: Swift-BAT detection of burst yesterday
  17. Swift trigger 159578 is not a burst
  18. Swift-BAT Trigger 159578 is a possible burst
  19. GRB050805A: Rc optical observations
  20. GRB 051006: Swift/UVOT Upper Limits
  21. GRB 051008 - a low redshift low-luminosity burst?
  22. GRB051008: Swift XRT refined analysis
  23. GRB051008 - Swift UVOT upper limits
  24. Konus-Wind observation of GRB 051008
  25. GRB051008: Final refined analysis of the Swift-BAT burst
  26. GRB 051008: R-band upper limit
  27. GRB051008: Refined analysis of the Swift-BAT burst
  28. GRB 051008: Swift XRT position
  29. GRB 051008: early Swift XRT analysis
  30. GRB 051008: Swift UVOT Candidate
  31. GRB051008: Swift-BAT detection of a bright burst
  32. GRB 051006: XRT refined analysis
  33. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  34. GRB 051006: optical observations at Sierra Nevada
  35. GRB051006: Refined analysis of the Swift-BAT burst
  36. GRB 051006: XRT position
  37. GRB051006: Swift detection of a burst
  38. Swift-BAT triggers 158261 and 158262 Retraction
  39. GRB051001: Swift UVOT Upper Limits
  40. GRB 050925: Second Epoch WSRT Radio Observations
  41. GRB 051001: Swift XRT refined analysis
  42. GRB 051001, optical observations at Mt. John
  43. GRB 051001: I-band limit
  44. GRB 051001: Swift-BAT refined analysis
  45. GRB 051001: Swift Detection of a Burst
  46. GRB 051001: ROTSE-III Optical Limits
  47. GRB050922B: optical limit
  48. GRB050925: Swift/XRT limits
  49. GRB/SGR 050925: IR Observations
  50. GRB050922C - Swift UVOT preliminary analysis
  51. GRB 050925: WSRT Radio Observations
  52. GRB050925: Swift UVOT upper limits
  53. Refined analysis of the Swift-BAT soft short burst
  54. GRB050925: Faulkes Telescope North R-band limit
  55. GRB050925: Swift-BAT detection of a short burst
  56. GRB 050922B: Correction to BAT refined analysis, longer burst
  57. GRB050922B: refined XRT analysis
  58. Konus-Wind observation of GRB 050922C
  59. GRB050922B: Swift UVOT early upper limits.
  60. GRB 050922B: optical limit
  61. GRB 050922C: Swift XRT refined analysis
  62. HETE Fregate observations of GRB 050922C
  63. GRB 050922C: Swift-BAT refined analysis
  64. GRB 050922B: Swift-BAT refined analysis
  65. GRB050922C: optical observations
  66. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  67. GRB 050922C: optical obserations
  68. GRB 050922C: NOT optical observations
  69. GRB 050922A: Analysis of Swift/XRT TOO observation
  70. GRB 050922C: Swift detection of a bright burst
  71. GRB 050922C: ROTSE-IIId Refined Analysis
  72. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  73. GRB 050922B: ROTSE-III Optical Limits
  74. GRB 050922B,optical observation
  75. GRB050922B: Swift-BAT detection of a weak long burst
  76. GRB050918: Possible Swift/XRT detected afterglow
  77. GRB050820B: analysis of the XMM-Newton observation
  78. GRB050916: Swift/UVOT Upper Limits
  79. GRB 050916: Swift-BAT refined analysis
  80. Swift-BAT trigger 155764 is not a GRB
  81. Swift-BAT trigger 155764 is probably not a GRB
  82. Swift trigger 155764: bad XRT centroid
  83. Swift-BAT trigger 155535 is definitely not a GRB
  84. GRB050916 : Swift-XRT refined analysis
  85. GRB 050916: XRT position
  86. GRB 050915B: Swift-BAT refined analysis
  87. GRB 050915B: Swift/UVOT Upper Limits
  88. GRB050916: Swift-BAT detection of a long weak burst
  89. GRB 050915B: XRT position
  90. GRB050915B: Swift-BAT detection of a long bright burst
  91. GRB050915: Swift/UVOT upper limits
  92. GRB 050915: KAIT optical limit
  93. GRB 050915: IR Observations
  94. GRB 050915: Swift XRT refined analysis
  95. GRB 050915: Swift-BAT refined analysis
  96. GRB050915, optical observations
  97. GRB050915: XRT position
  98. GRB 050915: ROTSE-III optical limits
  99. GRB 050915: Swift detection of a GRB
  100. GRB050911: Upper limit on X-ray afterglow

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