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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"

19758 results found.

  1. GRB 060923C, Swift-BAT partial refined analysis
  2. GRB 060923A: Swift XRT refined analysis
  3. GRB 060923A: Keck and Gemini Observations
  4. GRB 060923B, Swift-BAT refined analysis
  5. GRB060923C : Faulkes Telescope South optical limits
  6. GRB060923C: Faulkes Telescope North optical observations
  7. GRB 060923C: Swift detection of a burst
  8. GRB 060923B: Swift detection of a burst
  9. GRB 060923, Swift-BAT refined analysis
  10. GRB 060923: Early Super-LOTIS Observations
  11. GRB060923: Faulkes Telescope North optical observations
  12. GRB 060923: KAIT observations
  13. GRB 060923: Swift detection of a burst
  14. Swift detection of IGR J17497-2821 (trigger 230504)
  15. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  16. GRB060919: Swift/UVOT optical observations
  17. GRB 060919, Swift-BAT refined analysis
  18. GRB060919: XRT refined analysis
  19. GRB 060919: TAROT optical observations
  20. GRB 060919: Swift detection of a burst
  21. GRB 060912A: VLA Observation
  22. GRB060825: MAGIC telescope GeV observation
  23. Konus-Wind observation of GRB 060912
  24. GRB060912: Swift/UVOT Observations
  25. GRB060912: OPTIMA-Burst optical observations
  26. GRB 060912: Swift XRT Team Refined Analysis
  27. GRB 060912, Swift-BAT refined analysis
  28. GRB 060912: Swift detection of a burst with an optical afterglow
  29. VLA observations of GRB 060908
  30. GRB 060908, Swift/XRT refined analysis
  31. GRB 060908: Swift/UVOT Observations
  32. GRB 060908, Swift-BAT refined analysis
  33. GRB 060908 - SDSS Pre-burst Observations
  34. GRB 060908: Swift detection of a burst with a bright optical counterpart
  35. GRB 060904A: Suzaku/WAM observation of the prompt emission
  36. GRB060904b optical detections (delayed report due to internet outage)
  37. GRB 060906: Early RAPTOR optical limits
  38. GRB 060906, Swift-BAT refined spectral analysis
  39. GRB 060906: Swift/XRT Refined Analysis
  40. GRB 060906: Swift-UVOT observations
  41. VLT redshift of GRB 060906
  42. GRB 060906, Swift-BAT refined analysis
  43. GRB 060906: KAIT observations
  44. GRB 060906 (?): P60 Optical Afterglow Candidate
  45. GRB 060906: Swift detection of a probable burst
  46. GRB 060904A Milagro GeV/TeV Observations
  47. GRB060904A: Swift/UVOT optical observations
  48. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  49. GRB 060904B: Swift-BAT refined analysis
  50. GRB060904b: Optical observations with Swift/UVOT
  51. Konus-Wind observation of GRB 060904A
  52. GRB 060904B: Swift-XRT refined analysis
  53. GRB 060904A: Refined analysis of the Swift-BAT burst
  54. GRB 060904A: Swift-XRT refined analysis
  55. GRB 060904A: Suzaku-XIS and -HXD observation plan
  56. GRB 060904B: Optical observations at Crni Vrh
  57. GRB060904B: Watcher observations
  58. GRB 060904B BOOTES-IR and 1.5m OSN observations
  59. GRB 060904B: TAROT optical counterpart observations
  60. GRB060904B - SDSS Pre-Burst Observations
  61. GRB 060904: TAROT optical observations
  62. GRB 060904B: Swift detection of a burst with optical counterpart
  63. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  64. GRB060904 - SDSS Pre-Burst Observations
  65. GRB 060904: Swift detection of a bright burst
  66. 060901: Swift UVOT followup observations
  67. GRB 060901: Swift/XRT Refined Analysis
  68. GRB 060901: Swift/XRT Position
  69. Two bright bursts from SGR 1806-20 detected with IBAS
  70. GRB 060604: VLA Observation
  71. GRB 060814: Suzaku/WAM observation of the prompt emission
  72. GRB 060605: VLA Observation
  73. GRB 060707: VLA observation
  74. GRB 060825: VLA observations
  75. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  76. Swift-BAT trigger 226614 is not a GRB
  77. GRB060826 - SDSS Pre-Burst Observations
  78. GRB 060826(?): Swift detection of a possible burst
  79. GRB 060825: XRT Team Refined Analysis
  80. GRB 060825: Swift-BAT Refined Analysis
  81. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  82. GRB060825: Liverpool Telescope optical observations
  83. GRB 060825: TAROT optical observations
  84. GRB060825: BOOTES-IR optical observations
  85. GRB 060825: Swift detection of a burst
  86. GRB060729: analysis of XMM-Newton observation
  87. GRB 060814: pseudo-z from spectral parameters of the prompt
  88. Radio observations of GRB 060719
  89. GRB060814: Break in the XRT light curve
  90. GRB060813: Break in the XRT light curve
  91. GRB 060813: A long, bright GRB detected with Suzaku WAM
  92. Konus-Wind observation of GRB 060814
  93. GRB 060814: Refined analysis of the Swift-BAT burst
  94. GRB060805B: optical observations
  95. GRB060814: Swift/UVOT upper limits
  96. GRB 060813: pseudo-z from spectral parameters of the prompt
  97. GRB 060814: Swift XRT refined analysis
  98. GRB 060814 - SDSS Pre-Burst Observations
  99. GRB 060814: TAROT optical observations
  100. GRB 060814: Swift detection of a bright burst

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