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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"

21392 results found.

  1. GRB 060923B: Swift detection of a burst
  2. GRB 060923, Swift-BAT refined analysis
  3. GRB 060923: Early Super-LOTIS Observations
  4. GRB 060923: UKIRT nIR observations - candidate afterglow
  5. GRB060923: Faulkes Telescope North optical observations
  6. GRB 060923: KAIT observations
  7. GRB 060923: Swift detection of a burst
  8. Swift detection of IGR J17497-2821 (trigger 230504)
  9. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  10. GRB060919: Swift/UVOT optical observations
  11. GRB 060919 : Faulkes South Telescope Observations
  12. GRB 060919, Swift-BAT refined analysis
  13. GRB060919: XRT refined analysis
  14. GRB 060919: TAROT optical observations
  15. GRB 060919: Swift detection of a burst
  16. GRB 060912A: VLA Observation
  17. GRB060825: MAGIC telescope GeV observation
  18. Konus-Wind observation of GRB 060912
  19. GRB060912: Swift/UVOT Observations
  20. GRB060912: OPTIMA-Burst optical observations
  21. GRB 060912: Swift XRT Team Refined Analysis
  22. GRB 060912, Swift-BAT refined analysis
  23. GRB 060912: Swift detection of a burst with an optical afterglow
  24. VLA observations of GRB 060908
  25. GRB 060908, Swift/XRT refined analysis
  26. GRB 060908: Swift/UVOT Observations
  27. GRB 060908, Swift-BAT refined analysis
  28. GRB 060908 - SDSS Pre-burst Observations
  29. GRB 060908: Swift detection of a burst with a bright optical counterpart
  30. GRB 060904A: Suzaku/WAM observation of the prompt emission
  31. GRB060904b optical detections (delayed report due to internet outage)
  32. GRB 060906: Early RAPTOR optical limits
  33. GRB 060906, Swift-BAT refined spectral analysis
  34. GRB 060906: Swift/XRT Refined Analysis
  35. GRB 060906: Swift-UVOT observations
  36. VLT redshift of GRB 060906
  37. GRB 060906, Swift-BAT refined analysis
  38. GRB 060906: FRAM observations - flash determination (airplane)
  39. GRB 060906: KAIT observations
  40. GRB 060906: observations with FRAM
  41. GRB 060906 (?): P60 Optical Afterglow Candidate
  42. GRB 060906: Swift detection of a probable burst
  43. GRB 060904A Milagro GeV/TeV Observations
  44. GRB060904A: Swift/UVOT optical observations
  45. GRB 060904A: Subaru NIR observation
  46. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  47. GRB 060904B: Swift-BAT refined analysis
  48. GRB060904b: Optical observations with Swift/UVOT
  49. Konus-Wind observation of GRB 060904A
  50. GRB 060904B: Swift-XRT refined analysis
  51. GRB 060904A: Refined analysis of the Swift-BAT burst
  52. GRB 060904A: Swift-XRT refined analysis
  53. GRB 060904A: Suzaku-XIS and -HXD observation plan
  54. GRB 060904A: P60 Observations
  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. GRB060901: Optical observations
  66. 060901: Swift UVOT followup observations
  67. GRB 060901: Swift/XRT Refined Analysis
  68. GRB 060901: Swift/XRT Position
  69. GRB 060604: VLA Observation
  70. GRB 060814: Suzaku/WAM observation of the prompt emission
  71. GRB 060605: VLA Observation
  72. GRB 060707: VLA observation
  73. GRB 060825: VLA observations
  74. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  75. Swift-BAT trigger 226614 is not a GRB
  76. GRB060826 - SDSS Pre-Burst Observations
  77. GRB 060826(?): Swift detection of a possible burst
  78. GRB 060825: XRT Team Refined Analysis
  79. GRB 060825: Swift-BAT Refined Analysis
  80. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  81. GRB060825: Liverpool Telescope optical observations
  82. GRB 060825: TNG optical observations
  83. GRB 060825: TAROT optical observations
  84. GRB 060825: P60 Observations
  85. GRB060825: BOOTES-IR optical observations
  86. GRB 060825: Swift detection of a burst
  87. GRB060729: analysis of XMM-Newton observation
  88. GRB 060814: pseudo-z from spectral parameters of the prompt
  89. Radio observations of GRB 060719
  90. GRB060814: Break in the XRT light curve
  91. GRB060813: Break in the XRT light curve
  92. GRB 060813: A long, bright GRB detected with Suzaku WAM
  93. Konus-Wind observation of GRB 060814
  94. GRB 060814: Refined analysis of the Swift-BAT burst
  95. GRB 060814: P60 Observations
  96. GRB 060814: P200 NIR Observations
  97. GRB 060814: source inside revised XRT error box
  98. GRB 060814: Possible IR counterpart
  99. GRB060805B: optical observations
  100. GRB060814: Swift/UVOT upper limits

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