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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"

19595 results found.

  1. GRB 060912, Swift-BAT refined analysis
  2. GRB 060912: Swift detection of a burst with an optical afterglow
  3. VLA observations of GRB 060908
  4. GRB 060908, Swift/XRT refined analysis
  5. GRB 060908: Swift/UVOT Observations
  6. GRB 060908, Swift-BAT refined analysis
  7. GRB 060908 - SDSS Pre-burst Observations
  8. GRB 060908: Swift detection of a burst with a bright optical counterpart
  9. GRB 060904A: Suzaku/WAM observation of the prompt emission
  10. GRB060904b optical detections (delayed report due to internet outage)
  11. GRB 060906: Early RAPTOR optical limits
  12. GRB 060906, Swift-BAT refined spectral analysis
  13. GRB 060906: Swift/XRT Refined Analysis
  14. GRB 060906: Swift-UVOT observations
  15. VLT redshift of GRB 060906
  16. GRB 060906, Swift-BAT refined analysis
  17. GRB 060906: KAIT observations
  18. GRB 060906 (?): P60 Optical Afterglow Candidate
  19. GRB 060906: Swift detection of a probable burst
  20. GRB 060904A Milagro GeV/TeV Observations
  21. GRB060904A: Swift/UVOT optical observations
  22. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  23. GRB 060904B: Swift-BAT refined analysis
  24. GRB060904b: Optical observations with Swift/UVOT
  25. Konus-Wind observation of GRB 060904A
  26. GRB 060904B: Swift-XRT refined analysis
  27. GRB 060904A: Refined analysis of the Swift-BAT burst
  28. GRB 060904A: Swift-XRT refined analysis
  29. GRB 060904A: Suzaku-XIS and -HXD observation plan
  30. GRB 060904B: Optical observations at Crni Vrh
  31. GRB060904B: Watcher observations
  32. GRB 060904B BOOTES-IR and 1.5m OSN observations
  33. GRB 060904B: TAROT optical counterpart observations
  34. GRB060904B - SDSS Pre-Burst Observations
  35. GRB 060904: TAROT optical observations
  36. GRB 060904B: Swift detection of a burst with optical counterpart
  37. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  38. GRB060904 - SDSS Pre-Burst Observations
  39. GRB 060904: Swift detection of a bright burst
  40. 060901: Swift UVOT followup observations
  41. GRB 060901: Swift/XRT Refined Analysis
  42. GRB 060901: Swift/XRT Position
  43. GRB 060604: VLA Observation
  44. GRB 060814: Suzaku/WAM observation of the prompt emission
  45. GRB 060605: VLA Observation
  46. GRB 060707: VLA observation
  47. GRB 060825: VLA observations
  48. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  49. Swift-BAT trigger 226614 is not a GRB
  50. GRB060826 - SDSS Pre-Burst Observations
  51. GRB 060826(?): Swift detection of a possible burst
  52. GRB 060825: XRT Team Refined Analysis
  53. GRB 060825: Swift-BAT Refined Analysis
  54. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  55. GRB060825: Liverpool Telescope optical observations
  56. GRB 060825: TAROT optical observations
  57. GRB060825: BOOTES-IR optical observations
  58. GRB 060825: Swift detection of a burst
  59. GRB060729: analysis of XMM-Newton observation
  60. GRB 060814: pseudo-z from spectral parameters of the prompt
  61. Radio observations of GRB 060719
  62. GRB060814: Break in the XRT light curve
  63. GRB060813: Break in the XRT light curve
  64. GRB 060813: A long, bright GRB detected with Suzaku WAM
  65. Konus-Wind observation of GRB 060814
  66. GRB 060814: Refined analysis of the Swift-BAT burst
  67. GRB060805B: optical observations
  68. GRB060814: Swift/UVOT upper limits
  69. GRB 060813: pseudo-z from spectral parameters of the prompt
  70. GRB 060814: Swift XRT refined analysis
  71. GRB 060814 - SDSS Pre-Burst Observations
  72. GRB 060814: TAROT optical observations
  73. GRB 060814: Swift detection of a bright burst
  74. Konus-Wind observation of GRB 060813
  75. GRB060813: Swift/UVOT upper limits
  76. GRB 060813: Swift XRT refined analysis
  77. GRB 060813: Refined analysis of the Swift-BAT burst
  78. GRB 060813: Swift detection of a burst
  79. Image of the dust-scattering halo around SGR 1806-20
  80. A dust-scattering halo detected around SGR 1806-20
  81. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  82. GRB060714: optical observations
  83. GRB 060729: An update on the Swift XRT and UVOT observations
  84. GRB060807: Optical limiting magnitudes
  85. GRB 060805B: optical observation at Sierra Nevada
  86. GRB 060805B: XRT Team Analysis
  87. GRB 060807: UVOT Upper limits
  88. GRB 060807: XRT Team refined analysis
  89. GRB 060807: Refined analysis of the Swift-BAT burst
  90. IPN triangulation of GRB060806 (long, exceptionally bright)
  91. GRB060807 - SDSS Pre-burst Observations
  92. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  93. GRB 060805B: Swift/UVOT Upper Limits
  94. GRB 060807: Swift detection of a burst
  95. GRB 060805: XRT Team Refined Analysis
  96. GRB 060805: Swift-BAT Refined Analysis
  97. GRB 060805: Swift/UVOT Upper Limits
  98. GRB 060805: KAIT observations
  99. GRB 060805 - SDSS Pre-Burst Observations
  100. GRB 060805: Swift detection of a burst

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