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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"
  1. GRB 060906: Swift/XRT Refined Analysis
  2. GRB 060906: Swift-UVOT observations
  3. VLT redshift of GRB 060906
  4. GRB 060906, Swift-BAT refined analysis
  5. GRB 060906: FRAM observations - flash determination (airplane)
  6. GRB 060906: KAIT observations
  7. GRB 060906: Confirmation of P60 Optical Afterglow
  8. GRB 060906: observations with FRAM
  9. GRB 060906 (?): P60 Optical Afterglow Candidate
  10. GRB 060906: Swift detection of a probable burst
  11. GRB 060904A Milagro GeV/TeV Observations
  12. GRB060904b, optical observations
  13. GRB 060904b: SMARTS optical/IR afterglow observations
  14. GRB 060904B: RTT150 optical observations
  15. GRB060904A: Swift/UVOT optical observations
  16. GRB 060904A: Subaru NIR observation
  17. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  18. GRB 060904B: Swift-BAT refined analysis
  19. GRB060904b: Optical observations with Swift/UVOT
  20. Konus-Wind observation of GRB 060904A
  21. GRB 060904B: Swift-XRT refined analysis
  22. GRB 060904A: Refined analysis of the Swift-BAT burst
  23. GRB 060904A: Swift-XRT refined analysis
  24. GRB 060904A: Suzaku-XIS and -HXD observation plan
  25. GRB 060904B: VLT redshift
  26. GRB 060904A: P60 Observations
  27. GRB 060904B: Optical observations at Crni Vrh
  28. GRB060904B: Watcher observations
  29. GRB 060904B BOOTES-IR and 1.5m OSN observations
  30. GRB 060904B: TAROT optical counterpart observations
  31. GRB060904B - SDSS Pre-Burst Observations
  32. GRB 060904: TAROT optical observations
  33. GRB 060904B: Swift detection of a burst with optical counterpart
  34. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  35. GRB060904 - SDSS Pre-Burst Observations
  36. GRB 060904: Swift detection of a bright burst
  37. GRB060901: Optical observations
  38. 060901: Swift UVOT followup observations
  39. GRB 060901: pseudo-z from spectral parameters of the prompt
  40. Konus-Wind observation of GRB 060901
  41. GRB 060901: SMARTS optical/IR observations update
  42. GRB 060901: Swift/XRT Refined Analysis
  43. GRB 060901: SMARTS optical/IR observations
  44. GRB 060901: Swift/XRT Position
  45. GRB 060901: further INTEGRAL results
  46. GRB 060901: Watcher observations
  47. GRB 060901: a long GRB detected by INTEGRAL
  48. Two bright bursts from SGR 1806-20 detected with IBAS
  49. GRB 060605, observations using an Integral Field Unit
  50. GRB 060604: VLA Observation
  51. GRB 060814: Suzaku/WAM observation of the prompt emission
  52. GRB 060605: VLA Observation
  53. GRB 060707: VLA observation
  54. GRB 060825: VLA observations
  55. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  56. Swift-BAT trigger 226614 is not a GRB
  57. GRB060826 - SDSS Pre-Burst Observations
  58. GRB 060826(?): Swift detection of a possible burst
  59. GRB 060825: XRT Team Refined Analysis
  60. GRB 060825: Swift-BAT Refined Analysis
  61. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  62. GRB060825: Liverpool Telescope optical observations
  63. GRB 060825: TNG optical observations
  64. GRB 060825: TAROT optical observations
  65. GRB 060825: P60 Observations
  66. GRB060825: BOOTES-IR optical observations
  67. GRB 060825: Swift detection of a burst
  68. GRB060801: host galaxy redshift
  69. GRB060729: analysis of XMM-Newton observation
  70. GRB 060814: pseudo-z from spectral parameters of the prompt
  71. IBAS Alerts No 3429 and 3430: not GRBs
  72. Radio observations of GRB 060719
  73. GRB 060729, SMARTS optical/IR observations
  74. GRB060814: Break in the XRT light curve
  75. GRB060813: Break in the XRT light curve
  76. GRB 060813: A long, bright GRB detected with Suzaku WAM
  77. GRB 060814: Confirmation of IR afterglow
  78. Konus-Wind observation of GRB 060814
  79. GRB 060814: Refined analysis of the Swift-BAT burst
  80. GRB 060814: P60 Observations
  81. GRB 060814: P200 NIR Observations
  82. GRB 060814: source inside revised XRT error box
  83. GRB 060814: Possible IR counterpart
  84. GRB060805B: optical observations
  85. GRB060814: Swift/UVOT upper limits
  86. GRB 060813: pseudo-z from spectral parameters of the prompt
  87. GRB 060814: Swift XRT refined analysis
  88. GRB 060814: VLT optical limits
  89. GRB 060814 - SDSS Pre-Burst Observations
  90. GRB 060814: TAROT optical observations
  91. GRB 060814: Swift detection of a bright burst
  92. Konus-Wind observation of GRB 060813
  93. GRB060813: Swift/UVOT upper limits
  94. GRB 060813: Swift XRT refined analysis
  95. GRB 060813: Refined analysis of the Swift-BAT burst
  96. GRB 060813: Swift detection of a burst
  97. GRB051109B: Late-time Radio Observations
  98. Image of the dust-scattering halo around SGR 1806-20
  99. Second VLA limit on new radio point source in SGR 1806-20
  100. A dust-scattering halo detected around SGR 1806-20

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