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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"

35277 results found.

  1. GRB 060904A: Swift-XRT refined analysis
  2. GRB 060904A: Suzaku-XIS and -HXD observation plan
  3. GRB 060904B: VLT redshift
  4. GRB 060904A: P60 Observations
  5. GRB 060904B: Optical observations at Crni Vrh
  6. GRB060904B: Watcher observations
  7. GRB 060904B BOOTES-IR and 1.5m OSN observations
  8. GRB 060904B: TAROT optical counterpart observations
  9. GRB060904B - SDSS Pre-Burst Observations
  10. GRB 060904: TAROT optical observations
  11. GRB 060904B: Swift detection of a burst with optical counterpart
  12. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  13. GRB060904 - SDSS Pre-Burst Observations
  14. GRB 060904: Swift detection of a bright burst
  15. GRB 060901: pseudo-z from spectral parameters of the prompt
  16. Konus-Wind observation of GRB 060901
  17. GRB 060901: SMARTS optical/IR observations update
  18. GRB 060901: Swift/XRT Refined Analysis
  19. GRB 060901: SMARTS optical/IR observations
  20. GRB 060901: Swift/XRT Position
  21. GRB 060901: further INTEGRAL results
  22. GRB 060901: Watcher observations
  23. GRB 060901: a long GRB detected by INTEGRAL
  24. GRB 060605, observations using an Integral Field Unit
  25. GRB 060604: VLA Observation
  26. GRB 060814: Suzaku/WAM observation of the prompt emission
  27. GRB 060605: VLA Observation
  28. GRB 060707: VLA observation
  29. GRB 060825: VLA observations
  30. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  31. Swift-BAT trigger 226614 is not a GRB
  32. GRB060826 - SDSS Pre-Burst Observations
  33. GRB 060826(?): Swift detection of a possible burst
  34. GRB 060825: XRT Team Refined Analysis
  35. GRB 060825: Swift-BAT Refined Analysis
  36. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  37. GRB060825: Liverpool Telescope optical observations
  38. GRB 060825: TNG optical observations
  39. GRB 060825: TAROT optical observations
  40. GRB 060825: P60 Observations
  41. GRB060825: BOOTES-IR optical observations
  42. GRB 060825: Swift detection of a burst
  43. GRB060801: host galaxy redshift
  44. GRB060729: analysis of XMM-Newton observation
  45. GRB 060814: pseudo-z from spectral parameters of the prompt
  46. Radio observations of GRB 060719
  47. GRB 060729, SMARTS optical/IR observations
  48. GRB060814: Break in the XRT light curve
  49. GRB060813: Break in the XRT light curve
  50. GRB 060813: A long, bright GRB detected with Suzaku WAM
  51. GRB 060814: Confirmation of IR afterglow
  52. Konus-Wind observation of GRB 060814
  53. GRB 060814: Refined analysis of the Swift-BAT burst
  54. GRB 060814: P60 Observations
  55. GRB 060814: P200 NIR Observations
  56. GRB 060814: source inside revised XRT error box
  57. GRB 060814: Possible IR counterpart
  58. GRB060805B: optical observations
  59. GRB060814: Swift/UVOT upper limits
  60. GRB 060813: pseudo-z from spectral parameters of the prompt
  61. GRB 060814: Swift XRT refined analysis
  62. GRB 060814: VLT optical limits
  63. GRB 060814 - SDSS Pre-Burst Observations
  64. GRB 060814: TAROT optical observations
  65. GRB 060814: Swift detection of a bright burst
  66. Konus-Wind observation of GRB 060813
  67. GRB060813: Swift/UVOT upper limits
  68. GRB 060813: Swift XRT refined analysis
  69. GRB 060813: Refined analysis of the Swift-BAT burst
  70. GRB 060813: Swift detection of a burst
  71. GRB051109B: Late-time Radio Observations
  72. Second VLA limit on new radio point source in SGR 1806-20
  73. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  74. GRB060714: optical observations
  75. IBAS Alert n. 3422: not a GRB
  76. GRB 060729: An update on the Swift XRT and UVOT observations
  77. GRB060717: optical observations
  78. GRB060807: Optical limiting magnitudes
  79. GRB 060805B: optical observation at Sierra Nevada
  80. GRB 060805B: XRT Team Analysis
  81. VLA Upper Limit on Outburst of SGR 1806-20
  82. GRB 060807: UVOT Upper limits
  83. GRB 060807: afterglow confirmation
  84. GRB 060807: XRT Team refined analysis
  85. GRB 060807: K- and R-band observations
  86. GRB 060807: Refined analysis of the Swift-BAT burst
  87. GRB060807: optical afterglow candidate
  88. GRB 060805B: RHESSI Spectral Fit
  89. GRB060807: optical upper limit in white light
  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, optical observation
  95. GRB 060807: Kanazawa R-band observation
  96. GRB 060807: optical limit
  97. GRB 060807: Swift detection of a burst
  98. GRB 060801: Second Epoch WSRT Radio Observations
  99. IPN triangulation of GRB060805B
  100. GRB 060805: optical upper limit in R

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