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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"

21467 results found.

  1. GRB 060908: Swift/UVOT Observations
  2. GRB 060908, Swift-BAT refined analysis
  3. GRB 060908 - SDSS Pre-burst Observations
  4. GRB 060908: Swift detection of a burst with a bright optical counterpart
  5. GRB 060904A: Suzaku/WAM observation of the prompt emission
  6. GRB060904b optical detections (delayed report due to internet outage)
  7. GRB 060906: Early RAPTOR optical limits
  8. GRB 060906, Swift-BAT refined spectral analysis
  9. GRB 060906: Swift/XRT Refined Analysis
  10. GRB 060906: Swift-UVOT observations
  11. VLT redshift of GRB 060906
  12. GRB 060906, Swift-BAT refined analysis
  13. GRB 060906: FRAM observations - flash determination (airplane)
  14. GRB 060906: KAIT observations
  15. GRB 060906: observations with FRAM
  16. GRB 060906 (?): P60 Optical Afterglow Candidate
  17. GRB 060906: Swift detection of a probable burst
  18. GRB 060904A Milagro GeV/TeV Observations
  19. GRB060904A: Swift/UVOT optical observations
  20. GRB 060904A: Subaru NIR observation
  21. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  22. GRB 060904B: Swift-BAT refined analysis
  23. GRB060904b: Optical observations with Swift/UVOT
  24. Konus-Wind observation of GRB 060904A
  25. GRB 060904B: Swift-XRT refined analysis
  26. GRB 060904A: Refined analysis of the Swift-BAT burst
  27. GRB 060904A: Swift-XRT refined analysis
  28. GRB 060904A: Suzaku-XIS and -HXD observation plan
  29. GRB 060904A: P60 Observations
  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. GRB060901: Optical observations
  41. 060901: Swift UVOT followup observations
  42. GRB 060901: Swift/XRT Refined Analysis
  43. GRB 060901: Swift/XRT Position
  44. GRB 060604: VLA Observation
  45. GRB 060814: Suzaku/WAM observation of the prompt emission
  46. GRB 060605: VLA Observation
  47. GRB 060707: VLA observation
  48. GRB 060825: VLA observations
  49. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  50. Swift-BAT trigger 226614 is not a GRB
  51. GRB060826 - SDSS Pre-Burst Observations
  52. GRB 060826(?): Swift detection of a possible burst
  53. GRB 060825: XRT Team Refined Analysis
  54. GRB 060825: Swift-BAT Refined Analysis
  55. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  56. GRB060825: Liverpool Telescope optical observations
  57. GRB 060825: TNG optical observations
  58. GRB 060825: TAROT optical observations
  59. GRB 060825: P60 Observations
  60. GRB060825: BOOTES-IR optical observations
  61. GRB 060825: Swift detection of a burst
  62. GRB060729: analysis of XMM-Newton observation
  63. GRB 060814: pseudo-z from spectral parameters of the prompt
  64. Radio observations of GRB 060719
  65. GRB060814: Break in the XRT light curve
  66. GRB060813: Break in the XRT light curve
  67. GRB 060813: A long, bright GRB detected with Suzaku WAM
  68. Konus-Wind observation of GRB 060814
  69. GRB 060814: Refined analysis of the Swift-BAT burst
  70. GRB 060814: P60 Observations
  71. GRB 060814: P200 NIR Observations
  72. GRB 060814: source inside revised XRT error box
  73. GRB 060814: Possible IR counterpart
  74. GRB060805B: optical observations
  75. GRB060814: Swift/UVOT upper limits
  76. GRB 060813: pseudo-z from spectral parameters of the prompt
  77. GRB 060814: Swift XRT refined analysis
  78. GRB 060814 - SDSS Pre-Burst Observations
  79. GRB 060814: TAROT optical observations
  80. GRB 060814: Swift detection of a bright burst
  81. Konus-Wind observation of GRB 060813
  82. GRB060813: Swift/UVOT upper limits
  83. GRB 060813: Swift XRT refined analysis
  84. GRB 060813: Refined analysis of the Swift-BAT burst
  85. GRB 060813: Swift detection of a burst
  86. GRB051109B: Late-time Radio Observations
  87. Image of the dust-scattering halo around SGR 1806-20
  88. A dust-scattering halo detected around SGR 1806-20
  89. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  90. GRB060807: Possible Highly Significant X-ray Emission Lines
  91. GRB060714: optical observations
  92. GRB 060729: An update on the Swift XRT and UVOT observations
  93. GRB060717: optical observations
  94. GRB060807: Optical limiting magnitudes
  95. GRB 060805B: optical observation at Sierra Nevada
  96. GRB 060805B: XRT Team Analysis
  97. GRB 060807: UVOT Upper limits
  98. GRB 060807: XRT Team refined analysis
  99. GRB 060807: Refined analysis of the Swift-BAT burst
  100. GRB060807: optical afterglow candidate

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