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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"

43888 results found.

  1. GRB 060904B: Swift-XRT refined analysis
  2. GRB 060904A: Refined analysis of the Swift-BAT burst
  3. GRB 060904A: Swift-XRT refined analysis
  4. GRB 060904B: VLT redshift
  5. GRB 060904A: P60 Observations
  6. GRB 060904B: Optical observations at Crni Vrh
  7. GRB060904B: Watcher observations
  8. GRB 060904B BOOTES-IR and 1.5m OSN observations
  9. GRB 060904B: TAROT optical counterpart observations
  10. GRB060904B - SDSS Pre-Burst Observations
  11. GRB 060904: TAROT optical observations
  12. GRB 060904B: Swift detection of a burst with optical counterpart
  13. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  14. GRB060904 - SDSS Pre-Burst Observations
  15. GRB 060904: Swift detection of a bright burst
  16. GRB060901: Optical observations
  17. 060901: Swift UVOT followup observations
  18. GRB 060901: pseudo-z from spectral parameters of the prompt
  19. Konus-Wind observation of GRB 060901
  20. GRB 060901: SMARTS optical/IR observations update
  21. GRB 060901: Swift/XRT Refined Analysis
  22. GRB 060901: SMARTS optical/IR observations
  23. GRB 060901: Swift/XRT Position
  24. GRB 060901: Watcher observations
  25. GRB 060901: a long GRB detected by INTEGRAL
  26. Two bright bursts from SGR 1806-20 detected with IBAS
  27. GRB 060605, observations using an Integral Field Unit
  28. GRB 060604: VLA Observation
  29. GRB 060814: Suzaku/WAM observation of the prompt emission
  30. GRB 060605: VLA Observation
  31. GRB 060707: VLA observation
  32. GRB 060825: VLA observations
  33. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  34. Swift-BAT trigger 226614 is not a GRB
  35. GRB060826 - SDSS Pre-Burst Observations
  36. GRB 060826(?): Swift detection of a possible burst
  37. GRB 060825: XRT Team Refined Analysis
  38. GRB 060825: Swift-BAT Refined Analysis
  39. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  40. GRB060825: Liverpool Telescope optical observations
  41. GRB 060825: TNG optical observations
  42. GRB 060825: TAROT optical observations
  43. GRB 060825: P60 Observations
  44. GRB060825: BOOTES-IR optical observations
  45. GRB 060825: Swift detection of a burst
  46. GRB060801: host galaxy redshift
  47. GRB060729: analysis of XMM-Newton observation
  48. GRB 060814: pseudo-z from spectral parameters of the prompt
  49. Radio observations of GRB 060719
  50. GRB 060729, SMARTS optical/IR observations
  51. GRB060814: Break in the XRT light curve
  52. GRB060813: Break in the XRT light curve
  53. GRB 060813: A long, bright GRB detected with Suzaku WAM
  54. GRB 060814: Confirmation of IR afterglow
  55. Konus-Wind observation of GRB 060814
  56. GRB 060814: Refined analysis of the Swift-BAT burst
  57. GRB 060814: P60 Observations
  58. GRB 060814: P200 NIR Observations
  59. GRB 060814: source inside revised XRT error box
  60. GRB 060814: Possible IR counterpart
  61. GRB060805B: optical observations
  62. GRB060814: Swift/UVOT upper limits
  63. GRB 060813: pseudo-z from spectral parameters of the prompt
  64. GRB 060814: Swift XRT refined analysis
  65. GRB 060814: VLT optical limits
  66. GRB 060814 - SDSS Pre-Burst Observations
  67. GRB 060814: TAROT optical observations
  68. GRB 060814: Swift detection of a bright burst
  69. Konus-Wind observation of GRB 060813
  70. GRB060813: Swift/UVOT upper limits
  71. GRB 060813: Swift XRT refined analysis
  72. GRB 060813: Refined analysis of the Swift-BAT burst
  73. GRB 060813: Swift detection of a burst
  74. GRB051109B: Late-time Radio Observations
  75. Image of the dust-scattering halo around SGR 1806-20
  76. Second VLA limit on new radio point source in SGR 1806-20
  77. A dust-scattering halo detected around SGR 1806-20
  78. GRB 060805B: pseudo-z from spectral parameters of the prompt emission
  79. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  80. GRB060807: Possible Highly Significant X-ray Emission Lines
  81. GRB060714: optical observations
  82. IBAS Alert n. 3422: not a GRB
  83. GRB 060729: An update on the Swift XRT and UVOT observations
  84. GRB060717: optical observations
  85. GRB060807: Optical limiting magnitudes
  86. GRB 060805B: optical observation at Sierra Nevada
  87. GRB 060805B: XRT Team Analysis
  88. VLA Upper Limit on Outburst of SGR 1806-20
  89. GRB060806 is similar to previous activity of SGR1806-20
  90. GRB 060807: UVOT Upper limits
  91. GRB 060807: afterglow confirmation
  92. GRB 060807: XRT Team refined analysis
  93. GRB 060807: K- and R-band observations
  94. GRB 060807: Refined analysis of the Swift-BAT burst
  95. GRB060807: optical afterglow candidate
  96. GRB060806 = SGR1806-20
  97. GRB 060805B: RHESSI Spectral Fit
  98. GRB060807: optical upper limit in white light
  99. IPN triangulation of GRB060806 (long, exceptionally bright)
  100. GRB060807 - SDSS Pre-burst Observations

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