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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"

19413 results found.

  1. GRB 060923, Swift-BAT refined analysis
  2. GRB 060923: Early Super-LOTIS Observations
  3. GRB060923: Faulkes Telescope North optical observations
  4. GRB 060923: KAIT observations
  5. GRB 060923: Swift detection of a burst
  6. Swift detection of IGR J17497-2821 (trigger 230504)
  7. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  8. GRB060919: Swift/UVOT optical observations
  9. GRB 060919, Swift-BAT refined analysis
  10. GRB060919: XRT refined analysis
  11. GRB 060919: TAROT optical observations
  12. GRB 060919: Swift detection of a burst
  13. GRB 060912A: VLA Observation
  14. GRB060825: MAGIC telescope GeV observation
  15. Konus-Wind observation of GRB 060912
  16. GRB060912: Swift/UVOT Observations
  17. GRB060912: OPTIMA-Burst optical observations
  18. GRB 060912: Swift XRT Team Refined Analysis
  19. GRB 060912, Swift-BAT refined analysis
  20. GRB 060912: Swift detection of a burst with an optical afterglow
  21. VLA observations of GRB 060908
  22. GRB 060908, Swift/XRT refined analysis
  23. GRB 060908: Swift/UVOT Observations
  24. GRB 060908, Swift-BAT refined analysis
  25. GRB 060908 - SDSS Pre-burst Observations
  26. GRB 060908: Swift detection of a burst with a bright optical counterpart
  27. GRB 060904A: Suzaku/WAM observation of the prompt emission
  28. GRB060904b optical detections (delayed report due to internet outage)
  29. GRB 060906: Early RAPTOR optical limits
  30. GRB 060906, Swift-BAT refined spectral analysis
  31. GRB 060906: Swift/XRT Refined Analysis
  32. GRB 060906: Swift-UVOT observations
  33. VLT redshift of GRB 060906
  34. GRB 060906, Swift-BAT refined analysis
  35. GRB 060906: KAIT observations
  36. GRB 060906 (?): P60 Optical Afterglow Candidate
  37. GRB 060906: Swift detection of a probable burst
  38. GRB 060904A Milagro GeV/TeV Observations
  39. GRB060904A: Swift/UVOT optical observations
  40. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  41. GRB 060904B: Swift-BAT refined analysis
  42. GRB060904b: Optical observations with Swift/UVOT
  43. Konus-Wind observation of GRB 060904A
  44. GRB 060904B: Swift-XRT refined analysis
  45. GRB 060904A: Refined analysis of the Swift-BAT burst
  46. GRB 060904A: Swift-XRT refined analysis
  47. GRB 060904A: Suzaku-XIS and -HXD observation plan
  48. GRB 060904B: Optical observations at Crni Vrh
  49. GRB060904B: Watcher observations
  50. GRB 060904B BOOTES-IR and 1.5m OSN observations
  51. GRB 060904B: TAROT optical counterpart observations
  52. GRB060904B - SDSS Pre-Burst Observations
  53. GRB 060904: TAROT optical observations
  54. GRB 060904B: Swift detection of a burst with optical counterpart
  55. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  56. GRB060904 - SDSS Pre-Burst Observations
  57. GRB 060904: Swift detection of a bright burst
  58. 060901: Swift UVOT followup observations
  59. GRB 060901: Swift/XRT Refined Analysis
  60. GRB 060901: Swift/XRT Position
  61. GRB 060604: VLA Observation
  62. GRB 060814: Suzaku/WAM observation of the prompt emission
  63. GRB 060605: VLA Observation
  64. GRB 060707: VLA observation
  65. GRB 060825: VLA observations
  66. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  67. Swift-BAT trigger 226614 is not a GRB
  68. GRB060826 - SDSS Pre-Burst Observations
  69. GRB 060826(?): Swift detection of a possible burst
  70. GRB 060825: XRT Team Refined Analysis
  71. GRB 060825: Swift-BAT Refined Analysis
  72. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  73. GRB060825: Liverpool Telescope optical observations
  74. GRB 060825: TAROT optical observations
  75. GRB060825: BOOTES-IR optical observations
  76. GRB 060825: Swift detection of a burst
  77. GRB060729: analysis of XMM-Newton observation
  78. GRB 060814: pseudo-z from spectral parameters of the prompt
  79. Radio observations of GRB 060719
  80. GRB060814: Break in the XRT light curve
  81. GRB060813: Break in the XRT light curve
  82. GRB 060813: A long, bright GRB detected with Suzaku WAM
  83. Konus-Wind observation of GRB 060814
  84. GRB 060814: Refined analysis of the Swift-BAT burst
  85. GRB060805B: optical observations
  86. GRB060814: Swift/UVOT upper limits
  87. GRB 060813: pseudo-z from spectral parameters of the prompt
  88. GRB 060814: Swift XRT refined analysis
  89. GRB 060814 - SDSS Pre-Burst Observations
  90. GRB 060814: TAROT optical observations
  91. GRB 060814: Swift detection of a bright burst
  92. Konus-Wind observation of GRB 060813
  93. GRB060813: Swift/UVOT upper limits
  94. GRB 060813: Swift XRT refined analysis
  95. GRB 060813: Refined analysis of the Swift-BAT burst
  96. GRB 060813: Swift detection of a burst
  97. Image of the dust-scattering halo around SGR 1806-20
  98. A dust-scattering halo detected around SGR 1806-20
  99. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  100. GRB060714: optical observations

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