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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"

19688 results found.

  1. GRB 060929: BART observation
  2. GRB 060929: MASTER-VWF-Kislovodsk observations
  3. GRB 060929: BOOTES-IR & OSN observations
  4. Liverpool Telescope observations of GRB 060929
  5. GRB 060929: Swift detection of a burst
  6. GRB 060729: An update on the late-time Swift observations
  7. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  8. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  9. GRB 060927: Swift/UVOT Optical Observations
  10. GRB 060927: Swift XRT Team refined analysis
  11. GRB 060927, Swift-BAT refined analysis
  12. GRB060927: Faulkes Telescope South observation
  13. GRB060927 - SDSS Pre-Burst Observations
  14. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  15. Swift XRT boresight
  16. GRB 060927: Swift detection of a burst
  17. GRB060926: VLT redshift
  18. GRB 060926: Swift-UVOT Detections
  19. GRB 060926: Swift XRT refined analysis
  20. GRB 060926, Swift-BAT refined analysis
  21. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  22. GRB 060926: BOOTES-IR observations
  23. GRB060926 OPTIMA-Burst optical observation
  24. GRB 060926: Swift detection of a burst
  25. GRB 060923C, Swift-BAT refined analysis
  26. GRB 060923C: VLA Observation
  27. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  28. GRB060923B: Swift/UVOT upper limits
  29. GRB 060923B: Swift XRT Refined Analysis
  30. GRB 060923C: Swift XRT refined analysis
  31. GRB 060923C, Swift-BAT partial refined analysis
  32. GRB 060923A: Swift XRT refined analysis
  33. GRB 060923A: Keck and Gemini Observations
  34. GRB 060923B, Swift-BAT refined analysis
  35. GRB060923C : Faulkes Telescope South optical limits
  36. GRB060923C: Faulkes Telescope North optical observations
  37. GRB 060923C: Swift detection of a burst
  38. GRB 060923B: Swift detection of a burst
  39. GRB 060923, Swift-BAT refined analysis
  40. GRB 060923: Early Super-LOTIS Observations
  41. GRB060923: Faulkes Telescope North optical observations
  42. GRB 060923: KAIT observations
  43. GRB 060923: Swift detection of a burst
  44. Swift detection of IGR J17497-2821 (trigger 230504)
  45. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  46. GRB060919: Swift/UVOT optical observations
  47. GRB 060919, Swift-BAT refined analysis
  48. GRB060919: XRT refined analysis
  49. GRB 060919: TAROT optical observations
  50. GRB 060919: Swift detection of a burst
  51. GRB 060912A: VLA Observation
  52. GRB060825: MAGIC telescope GeV observation
  53. Konus-Wind observation of GRB 060912
  54. GRB060912: Swift/UVOT Observations
  55. GRB060912: OPTIMA-Burst optical observations
  56. GRB 060912: Swift XRT Team Refined Analysis
  57. GRB 060912, Swift-BAT refined analysis
  58. GRB 060912: Swift detection of a burst with an optical afterglow
  59. VLA observations of GRB 060908
  60. GRB 060908, Swift/XRT refined analysis
  61. GRB 060908: Swift/UVOT Observations
  62. GRB 060908, Swift-BAT refined analysis
  63. GRB 060908 - SDSS Pre-burst Observations
  64. GRB 060908: Swift detection of a burst with a bright optical counterpart
  65. GRB 060904A: Suzaku/WAM observation of the prompt emission
  66. GRB060904b optical detections (delayed report due to internet outage)
  67. GRB 060906: Early RAPTOR optical limits
  68. GRB 060906, Swift-BAT refined spectral analysis
  69. GRB 060906: Swift/XRT Refined Analysis
  70. GRB 060906: Swift-UVOT observations
  71. VLT redshift of GRB 060906
  72. GRB 060906, Swift-BAT refined analysis
  73. GRB 060906: KAIT observations
  74. GRB 060906 (?): P60 Optical Afterglow Candidate
  75. GRB 060906: Swift detection of a probable burst
  76. GRB 060904A Milagro GeV/TeV Observations
  77. GRB060904A: Swift/UVOT optical observations
  78. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  79. GRB 060904B: Swift-BAT refined analysis
  80. GRB060904b: Optical observations with Swift/UVOT
  81. Konus-Wind observation of GRB 060904A
  82. GRB 060904B: Swift-XRT refined analysis
  83. GRB 060904A: Refined analysis of the Swift-BAT burst
  84. GRB 060904A: Swift-XRT refined analysis
  85. GRB 060904A: Suzaku-XIS and -HXD observation plan
  86. GRB 060904B: Optical observations at Crni Vrh
  87. GRB060904B: Watcher observations
  88. GRB 060904B BOOTES-IR and 1.5m OSN observations
  89. GRB 060904B: TAROT optical counterpart observations
  90. GRB060904B - SDSS Pre-Burst Observations
  91. GRB 060904: TAROT optical observations
  92. GRB 060904B: Swift detection of a burst with optical counterpart
  93. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  94. GRB060904 - SDSS Pre-Burst Observations
  95. GRB 060904: Swift detection of a bright burst
  96. 060901: Swift UVOT followup observations
  97. GRB 060901: Swift/XRT Refined Analysis
  98. GRB 060901: Swift/XRT Position
  99. Two bright bursts from SGR 1806-20 detected with IBAS
  100. GRB 060604: VLA Observation

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