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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"

19604 results found.

  1. GRB060919: XRT refined analysis
  2. GRB 060919: TAROT optical observations
  3. GRB 060919: Swift detection of a burst
  4. GRB 060912A: VLA Observation
  5. GRB060825: MAGIC telescope GeV observation
  6. Konus-Wind observation of GRB 060912
  7. GRB060912: Swift/UVOT Observations
  8. GRB060912: OPTIMA-Burst optical observations
  9. GRB 060912: Swift XRT Team Refined Analysis
  10. GRB 060912, Swift-BAT refined analysis
  11. GRB 060912: Swift detection of a burst with an optical afterglow
  12. VLA observations of GRB 060908
  13. GRB 060908, Swift/XRT refined analysis
  14. GRB 060908: Swift/UVOT Observations
  15. GRB 060908, Swift-BAT refined analysis
  16. GRB 060908 - SDSS Pre-burst Observations
  17. GRB 060908: Swift detection of a burst with a bright optical counterpart
  18. GRB 060904A: Suzaku/WAM observation of the prompt emission
  19. GRB060904b optical detections (delayed report due to internet outage)
  20. GRB 060906: Early RAPTOR optical limits
  21. GRB 060906, Swift-BAT refined spectral analysis
  22. GRB 060906: Swift/XRT Refined Analysis
  23. GRB 060906: Swift-UVOT observations
  24. VLT redshift of GRB 060906
  25. GRB 060906, Swift-BAT refined analysis
  26. GRB 060906: KAIT observations
  27. GRB 060906 (?): P60 Optical Afterglow Candidate
  28. GRB 060906: Swift detection of a probable burst
  29. GRB 060904A Milagro GeV/TeV Observations
  30. GRB060904A: Swift/UVOT optical observations
  31. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  32. GRB 060904B: Swift-BAT refined analysis
  33. GRB060904b: Optical observations with Swift/UVOT
  34. Konus-Wind observation of GRB 060904A
  35. GRB 060904B: Swift-XRT refined analysis
  36. GRB 060904A: Refined analysis of the Swift-BAT burst
  37. GRB 060904A: Swift-XRT refined analysis
  38. GRB 060904A: Suzaku-XIS and -HXD observation plan
  39. GRB 060904B: Optical observations at Crni Vrh
  40. GRB060904B: Watcher observations
  41. GRB 060904B BOOTES-IR and 1.5m OSN observations
  42. GRB 060904B: TAROT optical counterpart observations
  43. GRB060904B - SDSS Pre-Burst Observations
  44. GRB 060904: TAROT optical observations
  45. GRB 060904B: Swift detection of a burst with optical counterpart
  46. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  47. GRB060904 - SDSS Pre-Burst Observations
  48. GRB 060904: Swift detection of a bright burst
  49. 060901: Swift UVOT followup observations
  50. GRB 060901: Swift/XRT Refined Analysis
  51. GRB 060901: Swift/XRT Position
  52. GRB 060604: VLA Observation
  53. GRB 060814: Suzaku/WAM observation of the prompt emission
  54. GRB 060605: VLA Observation
  55. GRB 060707: VLA observation
  56. GRB 060825: VLA observations
  57. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  58. Swift-BAT trigger 226614 is not a GRB
  59. GRB060826 - SDSS Pre-Burst Observations
  60. GRB 060826(?): Swift detection of a possible burst
  61. GRB 060825: XRT Team Refined Analysis
  62. GRB 060825: Swift-BAT Refined Analysis
  63. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  64. GRB060825: Liverpool Telescope optical observations
  65. GRB 060825: TAROT optical observations
  66. GRB060825: BOOTES-IR optical observations
  67. GRB 060825: Swift detection of a burst
  68. GRB060729: analysis of XMM-Newton observation
  69. GRB 060814: pseudo-z from spectral parameters of the prompt
  70. Radio observations of GRB 060719
  71. GRB060814: Break in the XRT light curve
  72. GRB060813: Break in the XRT light curve
  73. GRB 060813: A long, bright GRB detected with Suzaku WAM
  74. Konus-Wind observation of GRB 060814
  75. GRB 060814: Refined analysis of the Swift-BAT burst
  76. GRB060805B: optical observations
  77. GRB060814: Swift/UVOT upper limits
  78. GRB 060813: pseudo-z from spectral parameters of the prompt
  79. GRB 060814: Swift XRT refined analysis
  80. GRB 060814 - SDSS Pre-Burst Observations
  81. GRB 060814: TAROT optical observations
  82. GRB 060814: Swift detection of a bright burst
  83. Konus-Wind observation of GRB 060813
  84. GRB060813: Swift/UVOT upper limits
  85. GRB 060813: Swift XRT refined analysis
  86. GRB 060813: Refined analysis of the Swift-BAT burst
  87. GRB 060813: Swift detection of a burst
  88. Image of the dust-scattering halo around SGR 1806-20
  89. A dust-scattering halo detected around SGR 1806-20
  90. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  91. GRB060714: optical observations
  92. GRB 060729: An update on the Swift XRT and UVOT observations
  93. GRB060807: Optical limiting magnitudes
  94. GRB 060805B: optical observation at Sierra Nevada
  95. GRB 060805B: XRT Team Analysis
  96. GRB 060807: UVOT Upper limits
  97. GRB 060807: XRT Team refined analysis
  98. GRB 060807: Refined analysis of the Swift-BAT burst
  99. IPN triangulation of GRB060806 (long, exceptionally bright)
  100. GRB060807 - SDSS Pre-burst Observations

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