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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36195 results found.

  1. GRB 060906: Swift detection of a probable burst
  2. GRB 060904A Milagro GeV/TeV Observations
  3. GRB060904b, optical observations
  4. GRB 060904b: SMARTS optical/IR afterglow observations
  5. GRB 060904B: RTT150 optical observations
  6. GRB060904A: Swift/UVOT optical observations
  7. GRB 060904A: Subaru NIR observation
  8. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  9. GRB 060904B: Swift-BAT refined analysis
  10. Konus-Wind observation of GRB 060904A
  11. GRB 060904B: Swift-XRT refined analysis
  12. GRB 060904A: Refined analysis of the Swift-BAT burst
  13. GRB 060904A: Swift-XRT refined analysis
  14. GRB 060904A: Suzaku-XIS and -HXD observation plan
  15. GRB 060904B: VLT redshift
  16. GRB 060904A: P60 Observations
  17. GRB 060904B: Optical observations at Crni Vrh
  18. GRB060904B: Watcher observations
  19. GRB 060904B BOOTES-IR and 1.5m OSN observations
  20. GRB 060904B: TAROT optical counterpart observations
  21. GRB060904B - SDSS Pre-Burst Observations
  22. GRB 060904: TAROT optical observations
  23. GRB 060904B: Swift detection of a burst with optical counterpart
  24. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  25. GRB060904 - SDSS Pre-Burst Observations
  26. GRB 060904: Swift detection of a bright burst
  27. GRB 060901: pseudo-z from spectral parameters of the prompt
  28. Konus-Wind observation of GRB 060901
  29. GRB 060901: SMARTS optical/IR observations update
  30. GRB 060901: Swift/XRT Refined Analysis
  31. GRB 060901: SMARTS optical/IR observations
  32. GRB 060901: Swift/XRT Position
  33. GRB 060901: further INTEGRAL results
  34. GRB 060901: Watcher observations
  35. GRB 060901: a long GRB detected by INTEGRAL
  36. GRB 060605, observations using an Integral Field Unit
  37. GRB 060604: VLA Observation
  38. GRB 060814: Suzaku/WAM observation of the prompt emission
  39. GRB 060605: VLA Observation
  40. GRB 060707: VLA observation
  41. GRB 060825: VLA observations
  42. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  43. Swift-BAT trigger 226614 is not a GRB
  44. GRB060826 - SDSS Pre-Burst Observations
  45. GRB 060826(?): Swift detection of a possible burst
  46. GRB 060825: XRT Team Refined Analysis
  47. GRB 060825: Swift-BAT Refined Analysis
  48. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  49. GRB060825: Liverpool Telescope optical observations
  50. GRB 060825: TNG optical observations
  51. GRB 060825: TAROT optical observations
  52. GRB 060825: P60 Observations
  53. GRB060825: BOOTES-IR optical observations
  54. GRB 060825: Swift detection of a burst
  55. GRB060801: host galaxy redshift
  56. GRB060729: analysis of XMM-Newton observation
  57. GRB 060814: pseudo-z from spectral parameters of the prompt
  58. Radio observations of GRB 060719
  59. GRB 060729, SMARTS optical/IR observations
  60. GRB060814: Break in the XRT light curve
  61. GRB060813: Break in the XRT light curve
  62. GRB 060813: A long, bright GRB detected with Suzaku WAM
  63. GRB 060814: Confirmation of IR afterglow
  64. Konus-Wind observation of GRB 060814
  65. GRB 060814: Refined analysis of the Swift-BAT burst
  66. GRB 060814: P60 Observations
  67. GRB 060814: P200 NIR Observations
  68. GRB 060814: source inside revised XRT error box
  69. GRB 060814: Possible IR counterpart
  70. GRB060805B: optical observations
  71. GRB060814: Swift/UVOT upper limits
  72. GRB 060813: pseudo-z from spectral parameters of the prompt
  73. GRB 060814: Swift XRT refined analysis
  74. GRB 060814: VLT optical limits
  75. GRB 060814 - SDSS Pre-Burst Observations
  76. GRB 060814: TAROT optical observations
  77. GRB 060814: Swift detection of a bright burst
  78. Konus-Wind observation of GRB 060813
  79. GRB060813: Swift/UVOT upper limits
  80. GRB 060813: Swift XRT refined analysis
  81. GRB 060813: Refined analysis of the Swift-BAT burst
  82. GRB 060813: Swift detection of a burst
  83. GRB051109B: Late-time Radio Observations
  84. Second VLA limit on new radio point source in SGR 1806-20
  85. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  86. GRB060714: optical observations
  87. IBAS Alert n. 3422: not a GRB
  88. GRB 060729: An update on the Swift XRT and UVOT observations
  89. GRB060717: optical observations
  90. GRB060807: Optical limiting magnitudes
  91. GRB 060805B: optical observation at Sierra Nevada
  92. GRB 060805B: XRT Team Analysis
  93. VLA Upper Limit on Outburst of SGR 1806-20
  94. GRB 060807: UVOT Upper limits
  95. GRB 060807: afterglow confirmation
  96. GRB 060807: XRT Team refined analysis
  97. GRB 060807: K- and R-band observations
  98. GRB 060807: Refined analysis of the Swift-BAT burst
  99. GRB060807: optical afterglow candidate
  100. GRB 060805B: RHESSI Spectral Fit

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