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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. VLT redshift of GRB 060906
  2. GRB 060906, Swift-BAT refined analysis
  3. GRB 060906: FRAM observations - flash determination (airplane)
  4. GRB 060906: KAIT observations
  5. GRB 060906: Confirmation of P60 Optical Afterglow
  6. GRB 060906: observations with FRAM
  7. GRB 060906 (?): P60 Optical Afterglow Candidate
  8. GRB 060906: Swift detection of a probable burst
  9. GRB 060904A Milagro GeV/TeV Observations
  10. GRB060904b, optical observations
  11. GRB 060904b: SMARTS optical/IR afterglow observations
  12. GRB 060904B: RTT150 optical observations
  13. GRB060904A: Swift/UVOT optical observations
  14. GRB 060904A: Subaru NIR observation
  15. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  16. GRB 060904B: Swift-BAT refined analysis
  17. GRB060904b: Optical observations with Swift/UVOT
  18. Konus-Wind observation of GRB 060904A
  19. GRB 060904B: Swift-XRT refined analysis
  20. GRB 060904A: Refined analysis of the Swift-BAT burst
  21. GRB 060904A: Swift-XRT refined analysis
  22. GRB 060904A: Suzaku-XIS and -HXD observation plan
  23. GRB 060904B: VLT redshift
  24. GRB 060904A: P60 Observations
  25. GRB 060904B: Optical observations at Crni Vrh
  26. GRB060904B: Watcher observations
  27. GRB 060904B BOOTES-IR and 1.5m OSN observations
  28. GRB 060904B: TAROT optical counterpart observations
  29. GRB060904B - SDSS Pre-Burst Observations
  30. GRB 060904: TAROT optical observations
  31. GRB 060904B: Swift detection of a burst with optical counterpart
  32. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  33. GRB060904 - SDSS Pre-Burst Observations
  34. GRB 060904: Swift detection of a bright burst
  35. GRB060901: Optical observations
  36. 060901: Swift UVOT followup observations
  37. GRB 060901: pseudo-z from spectral parameters of the prompt
  38. Konus-Wind observation of GRB 060901
  39. GRB 060901: SMARTS optical/IR observations update
  40. GRB 060901: Swift/XRT Refined Analysis
  41. GRB 060901: SMARTS optical/IR observations
  42. GRB 060901: Swift/XRT Position
  43. GRB 060901: further INTEGRAL results
  44. GRB 060901: Watcher observations
  45. GRB 060901: a long GRB detected by INTEGRAL
  46. Two bright bursts from SGR 1806-20 detected with IBAS
  47. GRB 060605, observations using an Integral Field Unit
  48. GRB 060604: VLA Observation
  49. GRB 060814: Suzaku/WAM observation of the prompt emission
  50. GRB 060605: VLA Observation
  51. GRB 060707: VLA observation
  52. GRB 060825: VLA observations
  53. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  54. Swift-BAT trigger 226614 is not a GRB
  55. GRB060826 - SDSS Pre-Burst Observations
  56. GRB 060826(?): Swift detection of a possible burst
  57. GRB 060825: XRT Team Refined Analysis
  58. GRB 060825: Swift-BAT Refined Analysis
  59. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  60. GRB060825: Liverpool Telescope optical observations
  61. GRB 060825: TNG optical observations
  62. GRB 060825: TAROT optical observations
  63. GRB 060825: P60 Observations
  64. GRB060825: BOOTES-IR optical observations
  65. GRB 060825: Swift detection of a burst
  66. GRB060801: host galaxy redshift
  67. GRB060729: analysis of XMM-Newton observation
  68. GRB 060814: pseudo-z from spectral parameters of the prompt
  69. IBAS Alerts No 3429 and 3430: not GRBs
  70. Radio observations of GRB 060719
  71. GRB 060729, SMARTS optical/IR observations
  72. GRB060814: Break in the XRT light curve
  73. GRB060813: Break in the XRT light curve
  74. GRB 060813: A long, bright GRB detected with Suzaku WAM
  75. GRB 060814: Confirmation of IR afterglow
  76. Konus-Wind observation of GRB 060814
  77. GRB 060814: Refined analysis of the Swift-BAT burst
  78. GRB 060814: P60 Observations
  79. GRB 060814: P200 NIR Observations
  80. GRB 060814: source inside revised XRT error box
  81. GRB 060814: Possible IR counterpart
  82. GRB060805B: optical observations
  83. GRB060814: Swift/UVOT upper limits
  84. GRB 060813: pseudo-z from spectral parameters of the prompt
  85. GRB 060814: Swift XRT refined analysis
  86. GRB 060814: VLT optical limits
  87. GRB 060814 - SDSS Pre-Burst Observations
  88. GRB 060814: TAROT optical observations
  89. GRB 060814: Swift detection of a bright burst
  90. Konus-Wind observation of GRB 060813
  91. GRB060813: Swift/UVOT upper limits
  92. GRB 060813: Swift XRT refined analysis
  93. GRB 060813: Refined analysis of the Swift-BAT burst
  94. GRB 060813: Swift detection of a burst
  95. GRB051109B: Late-time Radio Observations
  96. Image of the dust-scattering halo around SGR 1806-20
  97. Second VLA limit on new radio point source in SGR 1806-20
  98. A dust-scattering halo detected around SGR 1806-20
  99. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  100. Swift detection of an outburst from the 4U 1246-58 LMXB burster

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