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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"

19350 results found.

  1. GRB 060929: Swift detection of a burst
  2. GRB 060729: An update on the late-time Swift observations
  3. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  4. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  5. GRB 060927: Swift/UVOT Optical Observations
  6. GRB 060927: Swift XRT Team refined analysis
  7. GRB 060927, Swift-BAT refined analysis
  8. GRB060927: Faulkes Telescope South observation
  9. GRB060927 - SDSS Pre-Burst Observations
  10. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  11. Swift XRT boresight
  12. GRB 060927: Swift detection of a burst
  13. GRB060926: VLT redshift
  14. GRB 060926: Swift-UVOT Detections
  15. GRB 060926: Swift XRT refined analysis
  16. GRB 060926, Swift-BAT refined analysis
  17. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  18. GRB 060926: BOOTES-IR observations
  19. GRB060926 OPTIMA-Burst optical observation
  20. GRB 060926: Swift detection of a burst
  21. GRB 060923C, Swift-BAT refined analysis
  22. GRB 060923C: VLA Observation
  23. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  24. GRB060923B: Swift/UVOT upper limits
  25. GRB 060923B: Swift XRT Refined Analysis
  26. GRB 060923C: Swift XRT refined analysis
  27. GRB 060923C, Swift-BAT partial refined analysis
  28. GRB 060923A: Swift XRT refined analysis
  29. GRB 060923A: Keck and Gemini Observations
  30. GRB 060923B, Swift-BAT refined analysis
  31. GRB060923C : Faulkes Telescope South optical limits
  32. GRB060923C: Faulkes Telescope North optical observations
  33. GRB 060923C: Swift detection of a burst
  34. GRB 060923B: Swift detection of a burst
  35. GRB 060923, Swift-BAT refined analysis
  36. GRB 060923: Early Super-LOTIS Observations
  37. GRB060923: Faulkes Telescope North optical observations
  38. GRB 060923: KAIT observations
  39. GRB 060923: Swift detection of a burst
  40. Swift detection of IGR J17497-2821 (trigger 230504)
  41. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  42. GRB060919: Swift/UVOT optical observations
  43. GRB 060919, Swift-BAT refined analysis
  44. GRB060919: XRT refined analysis
  45. GRB 060919: TAROT optical observations
  46. GRB 060919: Swift detection of a burst
  47. GRB 060912A: VLA Observation
  48. GRB060825: MAGIC telescope GeV observation
  49. Konus-Wind observation of GRB 060912
  50. GRB060912: Swift/UVOT Observations
  51. GRB060912: OPTIMA-Burst optical observations
  52. GRB 060912: Swift XRT Team Refined Analysis
  53. GRB 060912, Swift-BAT refined analysis
  54. GRB 060912: Swift detection of a burst with an optical afterglow
  55. VLA observations of GRB 060908
  56. GRB 060908, Swift/XRT refined analysis
  57. GRB 060908: Swift/UVOT Observations
  58. GRB 060908, Swift-BAT refined analysis
  59. GRB 060908 - SDSS Pre-burst Observations
  60. GRB 060908: Swift detection of a burst with a bright optical counterpart
  61. GRB 060904A: Suzaku/WAM observation of the prompt emission
  62. GRB060904b optical detections (delayed report due to internet outage)
  63. GRB 060906: Early RAPTOR optical limits
  64. GRB 060906, Swift-BAT refined spectral analysis
  65. GRB 060906: Swift/XRT Refined Analysis
  66. GRB 060906: Swift-UVOT observations
  67. VLT redshift of GRB 060906
  68. GRB 060906, Swift-BAT refined analysis
  69. GRB 060906: KAIT observations
  70. GRB 060906 (?): P60 Optical Afterglow Candidate
  71. GRB 060906: Swift detection of a probable burst
  72. GRB 060904A Milagro GeV/TeV Observations
  73. GRB060904A: Swift/UVOT optical observations
  74. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  75. GRB 060904B: Swift-BAT refined analysis
  76. GRB060904b: Optical observations with Swift/UVOT
  77. Konus-Wind observation of GRB 060904A
  78. GRB 060904B: Swift-XRT refined analysis
  79. GRB 060904A: Refined analysis of the Swift-BAT burst
  80. GRB 060904A: Swift-XRT refined analysis
  81. GRB 060904A: Suzaku-XIS and -HXD observation plan
  82. GRB 060904B: Optical observations at Crni Vrh
  83. GRB060904B: Watcher observations
  84. GRB 060904B BOOTES-IR and 1.5m OSN observations
  85. GRB 060904B: TAROT optical counterpart observations
  86. GRB060904B - SDSS Pre-Burst Observations
  87. GRB 060904: TAROT optical observations
  88. GRB 060904B: Swift detection of a burst with optical counterpart
  89. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  90. GRB060904 - SDSS Pre-Burst Observations
  91. GRB 060904: Swift detection of a bright burst
  92. 060901: Swift UVOT followup observations
  93. GRB 060901: Swift/XRT Refined Analysis
  94. GRB 060901: Swift/XRT Position
  95. GRB 060604: VLA Observation
  96. GRB 060814: Suzaku/WAM observation of the prompt emission
  97. GRB 060605: VLA Observation
  98. GRB 060707: VLA observation
  99. GRB 060825: VLA observations
  100. GRB 060825: pseudo-z from spectral parameters of the prompt emission

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