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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"

19171 results found.

  1. Konus-Wind observation of GRB 060904A
  2. GRB 060904B: Swift-XRT refined analysis
  3. GRB 060904A: Refined analysis of the Swift-BAT burst
  4. GRB 060904A: Swift-XRT refined analysis
  5. GRB 060904A: Suzaku-XIS and -HXD observation plan
  6. GRB 060904B: Optical observations at Crni Vrh
  7. GRB060904B: Watcher observations
  8. GRB 060904B BOOTES-IR and 1.5m OSN observations
  9. GRB 060904B: TAROT optical counterpart observations
  10. GRB060904B - SDSS Pre-Burst Observations
  11. GRB 060904: TAROT optical observations
  12. GRB 060904B: Swift detection of a burst with optical counterpart
  13. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  14. GRB060904 - SDSS Pre-Burst Observations
  15. GRB 060904: Swift detection of a bright burst
  16. 060901: Swift UVOT followup observations
  17. GRB 060901: Swift/XRT Refined Analysis
  18. GRB 060901: Swift/XRT Position
  19. GRB 060604: VLA Observation
  20. GRB 060814: Suzaku/WAM observation of the prompt emission
  21. GRB 060605: VLA Observation
  22. GRB 060707: VLA observation
  23. GRB 060825: VLA observations
  24. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  25. Swift-BAT trigger 226614 is not a GRB
  26. GRB060826 - SDSS Pre-Burst Observations
  27. GRB 060826(?): Swift detection of a possible burst
  28. GRB 060825: XRT Team Refined Analysis
  29. GRB 060825: Swift-BAT Refined Analysis
  30. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  31. GRB060825: Liverpool Telescope optical observations
  32. GRB 060825: TAROT optical observations
  33. GRB060825: BOOTES-IR optical observations
  34. GRB 060825: Swift detection of a burst
  35. GRB060729: analysis of XMM-Newton observation
  36. GRB 060814: pseudo-z from spectral parameters of the prompt
  37. Radio observations of GRB 060719
  38. GRB060814: Break in the XRT light curve
  39. GRB060813: Break in the XRT light curve
  40. GRB 060813: A long, bright GRB detected with Suzaku WAM
  41. Konus-Wind observation of GRB 060814
  42. GRB 060814: Refined analysis of the Swift-BAT burst
  43. GRB060805B: optical observations
  44. GRB060814: Swift/UVOT upper limits
  45. GRB 060813: pseudo-z from spectral parameters of the prompt
  46. GRB 060814: Swift XRT refined analysis
  47. GRB 060814 - SDSS Pre-Burst Observations
  48. GRB 060814: TAROT optical observations
  49. GRB 060814: Swift detection of a bright burst
  50. Konus-Wind observation of GRB 060813
  51. GRB060813: Swift/UVOT upper limits
  52. GRB 060813: Swift XRT refined analysis
  53. GRB 060813: Refined analysis of the Swift-BAT burst
  54. GRB 060813: Swift detection of a burst
  55. Image of the dust-scattering halo around SGR 1806-20
  56. A dust-scattering halo detected around SGR 1806-20
  57. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  58. GRB060714: optical observations
  59. GRB 060729: An update on the Swift XRT and UVOT observations
  60. GRB060807: Optical limiting magnitudes
  61. GRB 060805B: optical observation at Sierra Nevada
  62. GRB 060805B: XRT Team Analysis
  63. GRB 060807: UVOT Upper limits
  64. GRB 060807: XRT Team refined analysis
  65. GRB 060807: Refined analysis of the Swift-BAT burst
  66. IPN triangulation of GRB060806 (long, exceptionally bright)
  67. GRB060807 - SDSS Pre-burst Observations
  68. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  69. GRB 060805B: Swift/UVOT Upper Limits
  70. GRB 060807: Swift detection of a burst
  71. GRB 060805: XRT Team Refined Analysis
  72. GRB 060805: Swift-BAT Refined Analysis
  73. GRB 060805: Swift/UVOT Upper Limits
  74. GRB 060805: KAIT observations
  75. GRB 060805 - SDSS Pre-Burst Observations
  76. GRB 060805: Swift detection of a burst
  77. GRB 060804: Swift UVOT observations
  78. GRB 060804: Swift-XRT Team Refined Analysis
  79. GRB 060804: Refined analysis of the Swift-BAT burst
  80. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  81. GRB 060728: Upper limits of the X-ray emission
  82. GRB 060801: WSRT Radio Observations
  83. GRB060801: Radio Observations
  84. GRB060801: Swift/UVOT Upper Limits
  85. GRB 060801: optical observations at Hanle and Calar Alto
  86. GRB 060801: Swift XRT refined analysis
  87. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  88. GRB 060801: Swift detection of a short burst
  89. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  90. Swift-BAT trigger 221873 is not a GRB or a Transient
  91. GRB 060729: Swift/UVOT Detections
  92. GRB 060729: Refined analysis of the Swift-BAT burst
  93. GRB 060729: Swift-XRT refined analysis
  94. GRB 060729: Swift/UVOT Observations
  95. GRB 060729: ROTSE-III Detection of Optical Counterpart
  96. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  97. GRB 060728: Swift/UVOT Upper Limits
  98. GRB 060728: Refined analysis of the Swift-BAT burst
  99. Swift/XRT preliminary analysis
  100. GRB 060728: Swift detection of a burst

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