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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"

21267 results found.

  1. GRB 060904: Swift detection of a bright burst
  2. GRB060901: Optical observations
  3. 060901: Swift UVOT followup observations
  4. Konus-Wind observation of GRB 060901
  5. GRB 060605, observations using an Integral Field Unit
  6. GRB 060604: VLA Observation
  7. GRB 060814: Suzaku/WAM observation of the prompt emission
  8. GRB 060605: VLA Observation
  9. GRB 060707: VLA observation
  10. GRB 060825: VLA observations
  11. GRB060826 - SDSS Pre-Burst Observations
  12. GRB 060826(?): Swift detection of a possible burst
  13. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  14. GRB 060825: TNG optical observations
  15. GRB 060825: TAROT optical observations
  16. GRB 060825: P60 Observations
  17. GRB060729: analysis of XMM-Newton observation
  18. GRB 060729, SMARTS optical/IR observations
  19. GRB 060813: A long, bright GRB detected with Suzaku WAM
  20. Konus-Wind observation of GRB 060814
  21. GRB 060814: Refined analysis of the Swift-BAT burst
  22. GRB 060814: P60 Observations
  23. GRB 060814: P200 NIR Observations
  24. GRB 060814: VLT optical limits
  25. GRB 060814 - SDSS Pre-Burst Observations
  26. GRB 060814: TAROT optical observations
  27. GRB 060814: Swift detection of a bright burst
  28. Konus-Wind observation of GRB 060813
  29. GRB 060813: Swift detection of a burst
  30. GRB051109B: Late-time Radio Observations
  31. Second VLA limit on new radio point source in SGR 1806-20
  32. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  33. GRB060807: Possible Highly Significant X-ray Emission Lines
  34. GRB 060729: An update on the Swift XRT and UVOT observations
  35. GRB060717: optical observations
  36. GRB 060805B: XRT Team Analysis
  37. VLA Upper Limit on Outburst of SGR 1806-20
  38. GRB060806 is similar to previous activity of SGR1806-20
  39. GRB 060807: K- and R-band observations
  40. GRB060807: optical afterglow candidate
  41. GRB060807: optical upper limit in white light
  42. IPN triangulation of GRB060806 (long, exceptionally bright)
  43. GRB060807 - SDSS Pre-burst Observations
  44. GRB 060805B: Swift/UVOT Upper Limits
  45. GRB 060807, optical observation
  46. GRB 060807: Kanazawa R-band observation
  47. GRB060805 Liverpool Telescope observations
  48. GRB 060805: Swift/UVOT Upper Limits
  49. GRB 060805: P60 Observations
  50. GRB 060805 - SDSS Pre-Burst Observations
  51. GRB 060805: Swift detection of a burst
  52. GRB 060804: Swift UVOT observations
  53. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  54. GRB 060728: Upper limits of the X-ray emission
  55. GRB 060801: no variability of optical sources
  56. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  57. GRB060801: Radio Observations
  58. GRB 051109B: Bright spiral host galaxy at low redshift
  59. GRB060801: Swift/UVOT Upper Limits
  60. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  61. GRB 060801, optical observation
  62. GRB 060801: Kanazawa Optical Observation
  63. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  64. GRB 060719: TORTOREM optical upper limits
  65. GRB 060729: Swift-XRT refined analysis
  66. GRB 060729: Swift/UVOT Observations
  67. GRB 060729: ROTSE-III Detection of Optical Counterpart
  68. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  69. GRB 060728: Swift/UVOT Upper Limits
  70. GRB 060728, SMARTS optical/IR observations
  71. Swift/XRT preliminary analysis
  72. GRB 060728: Swift detection of a burst
  73. GRB 060714: Swift/UVOT Observations
  74. GRB060719: prompt NIR observations with REM
  75. GRB 060714: NOT observations
  76. GRB 060719: near-infrared afterglow
  77. GRB 060522: VLA observation
  78. GRB 060719: Swift/UVOT Upper Limits
  79. GRB 060719: VLT/ISAAC observations
  80. GRB 060719: Refined analysis of the Swift-BAT burst
  81. GRB 060719: XRT refined analysis
  82. GRB060719: REM NIR Observations
  83. GRB 060719: VLT observations
  84. GRB 060719: LCO optical observations
  85. GRB 060719: Swift detection of a burst
  86. GRB 060714: Refined analysis of the Swift-BAT burst
  87. GRB060717: Swift/UVOT upper limits
  88. GRB060717 - SDSS Pre-burst Observations
  89. GRB 060714: REM infrared observations
  90. GRB 060717, optical observation
  91. GRB 060717: Swift detection of a burst
  92. GRB 060714 : Liverpool Telescope Observations
  93. GRB 060708: VLT spectroscopy
  94. Swift trigger 219136 is probably not a GRB
  95. GRB 060714, optical observation
  96. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  97. GRB060712: P60 Observations
  98. GRB 060712: Swift/UVOT Upper Limits
  99. GRB 060712: XRT refined position
  100. GRB 060712: Refined analysis of the Swift-BAT burst

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