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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"

18638 results found.

  1. GRB 060825: Swift detection of a burst
  2. GRB060729: analysis of XMM-Newton observation
  3. GRB 060814: pseudo-z from spectral parameters of the prompt
  4. Radio observations of GRB 060719
  5. GRB060814: Break in the XRT light curve
  6. GRB060813: Break in the XRT light curve
  7. GRB 060813: A long, bright GRB detected with Suzaku WAM
  8. Konus-Wind observation of GRB 060814
  9. GRB 060814: Refined analysis of the Swift-BAT burst
  10. GRB060805B: optical observations
  11. GRB060814: Swift/UVOT upper limits
  12. GRB 060813: pseudo-z from spectral parameters of the prompt
  13. GRB 060814: Swift XRT refined analysis
  14. GRB 060814 - SDSS Pre-Burst Observations
  15. GRB 060814: TAROT optical observations
  16. GRB 060814: Swift detection of a bright burst
  17. Konus-Wind observation of GRB 060813
  18. GRB060813: Swift/UVOT upper limits
  19. GRB 060813: Swift XRT refined analysis
  20. GRB 060813: Refined analysis of the Swift-BAT burst
  21. GRB 060813: Swift detection of a burst
  22. Image of the dust-scattering halo around SGR 1806-20
  23. A dust-scattering halo detected around SGR 1806-20
  24. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  25. GRB060714: optical observations
  26. GRB 060729: An update on the Swift XRT and UVOT observations
  27. GRB060807: Optical limiting magnitudes
  28. GRB 060805B: optical observation at Sierra Nevada
  29. GRB 060805B: XRT Team Analysis
  30. GRB 060807: UVOT Upper limits
  31. GRB 060807: XRT Team refined analysis
  32. GRB 060807: Refined analysis of the Swift-BAT burst
  33. IPN triangulation of GRB060806 (long, exceptionally bright)
  34. GRB060807 - SDSS Pre-burst Observations
  35. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  36. GRB 060805B: Swift/UVOT Upper Limits
  37. GRB 060807: Swift detection of a burst
  38. GRB 060805: XRT Team Refined Analysis
  39. GRB 060805: Swift-BAT Refined Analysis
  40. GRB 060805: Swift/UVOT Upper Limits
  41. GRB 060805: KAIT observations
  42. GRB 060805 - SDSS Pre-Burst Observations
  43. GRB 060805: Swift detection of a burst
  44. GRB 060804: Swift UVOT observations
  45. GRB 060804: Swift-XRT Team Refined Analysis
  46. GRB 060804: Refined analysis of the Swift-BAT burst
  47. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  48. GRB 060728: Upper limits of the X-ray emission
  49. GRB 060801: WSRT Radio Observations
  50. GRB060801: Radio Observations
  51. GRB060801: Swift/UVOT Upper Limits
  52. GRB 060801: optical observations at Hanle and Calar Alto
  53. GRB 060801: Swift XRT refined analysis
  54. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  55. GRB 060801: Swift detection of a short burst
  56. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  57. Swift-BAT trigger 221873 is not a GRB or a Transient
  58. GRB 060729: Swift/UVOT Detections
  59. GRB 060729: Refined analysis of the Swift-BAT burst
  60. GRB 060729: Swift-XRT refined analysis
  61. GRB 060729: Swift/UVOT Observations
  62. GRB 060729: ROTSE-III Detection of Optical Counterpart
  63. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  64. GRB 060728: Swift/UVOT Upper Limits
  65. GRB 060728: Refined analysis of the Swift-BAT burst
  66. Swift/XRT preliminary analysis
  67. GRB 060728: Swift detection of a burst
  68. GRB060614 ATCA Radio Limits
  69. GRB 060714: Swift/UVOT Observations
  70. GRB 060522: VLA observation
  71. GRB 060719: Swift/UVOT Upper Limits
  72. GRB 060719: Refined analysis of the Swift-BAT burst
  73. GRB 060719: XRT refined analysis
  74. GRB 060719: optical limit by Pi-of-the-Sky
  75. GRB060719: FRAM early follow-up limit
  76. GRB 060719: Swift detection of a burst
  77. GRB 060717: Swift XRT refined analysis
  78. GRB 060714: Refined analysis of the Swift-BAT burst
  79. GRB060717: Swift/UVOT upper limits
  80. GRB 060717: Swift XRT refined position
  81. GRB 060717: Swift-BAT refined analysis
  82. GRB 060717: Swift detection of a burst
  83. GRB 060714: Swift XRT refined analysis
  84. GRB060708: MARGE low resolution spectrum observations
  85. Swift-BAT trigger 219136 is not a GRB
  86. GRB060707 possible optical confirmation
  87. Swift trigger 219136 is probably not a GRB
  88. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  89. GRB 060712: XRT refined analysis
  90. GRB 060712: Swift/UVOT Upper Limits
  91. GRB 060712: XRT refined position
  92. GRB 060712: Refined analysis of the Swift-BAT burst
  93. GRB 060712: Swift detection of a burst
  94. GRB 060708: Swift-XRT refined analysis
  95. GCN 060708: Swift-UVOT Observations
  96. GRB 060708: Refined analysis of the Swift-BAT burst
  97. GCN 060707: Swift-UVOT observations
  98. GRB 060707: Swift-XRT refined analysis
  99. GRB 060708: Swift detection of a burst with an UVOT countpart
  100. GRB060707 possible optical confirmation

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