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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"

21770 results found.

  1. GRB 060904: TAROT optical observations
  2. GRB 060904B: Swift detection of a burst with optical counterpart
  3. GRB060904 - SDSS Pre-Burst Observations
  4. GRB 060904: Swift detection of a bright burst
  5. GRB060901: Optical observations
  6. 060901: Swift UVOT followup observations
  7. Konus-Wind observation of GRB 060901
  8. GRB 060605, observations using an Integral Field Unit
  9. GRB 060604: VLA Observation
  10. GRB 060814: Suzaku/WAM observation of the prompt emission
  11. GRB 060605: VLA Observation
  12. GRB 060707: VLA observation
  13. GRB 060825: VLA observations
  14. GRB060826 - SDSS Pre-Burst Observations
  15. GRB 060826(?): Swift detection of a possible burst
  16. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  17. GRB 060825: TNG optical observations
  18. GRB 060825: TAROT optical observations
  19. GRB 060825: P60 Observations
  20. GRB060729: analysis of XMM-Newton observation
  21. GRB 060729, SMARTS optical/IR observations
  22. GRB 060813: A long, bright GRB detected with Suzaku WAM
  23. Konus-Wind observation of GRB 060814
  24. GRB 060814: Refined analysis of the Swift-BAT burst
  25. GRB 060814: P60 Observations
  26. GRB 060814: P200 NIR Observations
  27. GRB 060814: VLT optical limits
  28. GRB 060814 - SDSS Pre-Burst Observations
  29. GRB 060814: TAROT optical observations
  30. GRB 060814: Swift detection of a bright burst
  31. Konus-Wind observation of GRB 060813
  32. GRB 060813: Swift detection of a burst
  33. GRB051109B: Late-time Radio Observations
  34. Second VLA limit on new radio point source in SGR 1806-20
  35. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  36. GRB060807: Possible Highly Significant X-ray Emission Lines
  37. GRB 060729: An update on the Swift XRT and UVOT observations
  38. GRB060717: optical observations
  39. GRB 060805B: XRT Team Analysis
  40. VLA Upper Limit on Outburst of SGR 1806-20
  41. GRB060806 is similar to previous activity of SGR1806-20
  42. GRB 060807: K- and R-band observations
  43. GRB060807: optical afterglow candidate
  44. GRB060807: optical upper limit in white light
  45. IPN triangulation of GRB060806 (long, exceptionally bright)
  46. GRB060807 - SDSS Pre-burst Observations
  47. GRB 060805B: Swift/UVOT Upper Limits
  48. GRB 060807, optical observation
  49. GRB 060807: Kanazawa R-band observation
  50. GRB060805 Liverpool Telescope observations
  51. GRB 060805: Swift/UVOT Upper Limits
  52. GRB 060805: P60 Observations
  53. GRB 060805 - SDSS Pre-Burst Observations
  54. GRB 060805: Swift detection of a burst
  55. GRB 060804: Swift UVOT observations
  56. GRB 060804: Swift detection of a burst with a possible UVOT counterpart
  57. GRB 060728: Upper limits of the X-ray emission
  58. GRB 060801: no variability of optical sources
  59. GRB 060801: XRT/SDSS Frame Offset and Refined XRT Position
  60. GRB060801: Radio Observations
  61. GRB 051109B: Bright spiral host galaxy at low redshift
  62. GRB060801: Swift/UVOT Upper Limits
  63. GRB 060801: Refined analysis of the Swift-BAT short hard burst
  64. GRB 060801, optical observation
  65. GRB 060801: Kanazawa Optical Observation
  66. GRB060729: ROTSE-III Observations of the Slow Optical Decay
  67. GRB 060719: TORTOREM optical upper limits
  68. GRB 060729: Swift-XRT refined analysis
  69. GRB 060729: Swift/UVOT Observations
  70. GRB 060729: ROTSE-III Detection of Optical Counterpart
  71. GRB 060729: Swift detection of a burst with an UVOT optical counterpart
  72. GRB 060728: Swift/UVOT Upper Limits
  73. GRB 060728, SMARTS optical/IR observations
  74. Swift/XRT preliminary analysis
  75. GRB 060728: Swift detection of a burst
  76. GRB 060714: Swift/UVOT Observations
  77. GRB060719: prompt NIR observations with REM
  78. GRB 060714: NOT observations
  79. GRB 060719: near-infrared afterglow
  80. GRB 060522: VLA observation
  81. GRB 060719: Swift/UVOT Upper Limits
  82. GRB 060719: VLT/ISAAC observations
  83. GRB 060719: Refined analysis of the Swift-BAT burst
  84. GRB 060719: XRT refined analysis
  85. GRB060719: REM NIR Observations
  86. GRB 060719: VLT observations
  87. GRB 060719: LCO optical observations
  88. GRB 060719: Swift detection of a burst
  89. GRB 060714: Refined analysis of the Swift-BAT burst
  90. GRB060717: Swift/UVOT upper limits
  91. GRB060717 - SDSS Pre-burst Observations
  92. GRB 060714: REM infrared observations
  93. GRB 060717, optical observation
  94. GRB 060717: Swift detection of a burst
  95. GRB 060714 : Liverpool Telescope Observations
  96. GRB 060708: VLT spectroscopy
  97. Swift trigger 219136 is probably not a GRB
  98. GRB 060714, optical observation
  99. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  100. GRB060712: P60 Observations

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