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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"

19420 results found.

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

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