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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"

26038 results found.

  1. GRB 060912, Swift-BAT refined analysis
  2. GRB 060912: Swift detection of a burst with an optical afterglow
  3. GRB060906: Danish/DFOSC optical observations
  4. VLA observations of GRB 060908
  5. GRB 060908, Swift/XRT refined analysis
  6. GRB 060908: Swift/UVOT Observations
  7. GRB 060908, Swift-BAT refined analysis
  8. GRB 060908 - SDSS Pre-burst Observations
  9. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  10. GRB 060904B: Kiso Optical observation
  11. GRB 060904A : Optical limit
  12. GRB 060908: Swift detection of a burst with a bright optical counterpart
  13. GRB 060904A: Suzaku/WAM observation of the prompt emission
  14. GRB060904b optical detections (delayed report due to internet outage)
  15. GRB 060906: optical observation
  16. GRB 060906: Early RAPTOR optical limits
  17. GRB 060906, Swift-BAT refined spectral analysis
  18. GRB 060906: Swift/XRT Refined Analysis
  19. GRB 060906: Swift-UVOT observations
  20. VLT redshift of GRB 060906
  21. GRB 060906, Swift-BAT refined analysis
  22. GRB 060906: FRAM observations - flash determination (airplane)
  23. GRB 060906: KAIT observations
  24. GRB 060906: Confirmation of P60 Optical Afterglow
  25. GRB 060906: observations with FRAM
  26. GRB 060906 (?): P60 Optical Afterglow Candidate
  27. GRB 060906: Swift detection of a probable burst
  28. GRB 060904A Milagro GeV/TeV Observations
  29. GRB 060904b: SMARTS optical/IR afterglow observations
  30. GRB060904A: Swift/UVOT optical observations
  31. GRB 060904A: Subaru NIR observation
  32. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  33. GRB 060904B: Swift-BAT refined analysis
  34. GRB060904b: Optical observations with Swift/UVOT
  35. Konus-Wind observation of GRB 060904A
  36. GRB 060904B: Swift-XRT refined analysis
  37. GRB 060904A: Refined analysis of the Swift-BAT burst
  38. GRB 060904A: Swift-XRT refined analysis
  39. GRB 060904A: Suzaku-XIS and -HXD observation plan
  40. GRB 060904A: P60 Observations
  41. GRB 060904B: Optical observations at Crni Vrh
  42. GRB060904B: Watcher observations
  43. GRB 060904B BOOTES-IR and 1.5m OSN observations
  44. GRB 060904B: TAROT optical counterpart observations
  45. GRB060904B - SDSS Pre-Burst Observations
  46. GRB 060904: TAROT optical observations
  47. GRB 060904B: Swift detection of a burst with optical counterpart
  48. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  49. GRB060904 - SDSS Pre-Burst Observations
  50. GRB 060904: Swift detection of a bright burst
  51. GRB060901: Optical observations
  52. 060901: Swift UVOT followup observations
  53. GRB 060901: Swift/XRT Refined Analysis
  54. GRB 060901: SMARTS optical/IR observations
  55. GRB 060901: Swift/XRT Position
  56. GRB 060604: VLA Observation
  57. GRB 060814: Suzaku/WAM observation of the prompt emission
  58. GRB 060605: VLA Observation
  59. GRB 060707: VLA observation
  60. GRB 060825: VLA observations
  61. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  62. Swift-BAT trigger 226614 is not a GRB
  63. GRB060826 - SDSS Pre-Burst Observations
  64. GRB 060826(?): Swift detection of a possible burst
  65. GRB 060825: XRT Team Refined Analysis
  66. GRB 060825: Swift-BAT Refined Analysis
  67. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  68. GRB060825: Liverpool Telescope optical observations
  69. GRB 060825: TNG optical observations
  70. GRB 060825: TAROT optical observations
  71. GRB 060825: P60 Observations
  72. GRB060825: BOOTES-IR optical observations
  73. GRB 060825: Swift detection of a burst
  74. GRB060729: analysis of XMM-Newton observation
  75. GRB 060814: pseudo-z from spectral parameters of the prompt
  76. Radio observations of GRB 060719
  77. GRB 060729, SMARTS optical/IR observations
  78. GRB060814: Break in the XRT light curve
  79. GRB060813: Break in the XRT light curve
  80. GRB 060813: A long, bright GRB detected with Suzaku WAM
  81. GRB 060814: Confirmation of IR afterglow
  82. Konus-Wind observation of GRB 060814
  83. GRB 060814: Refined analysis of the Swift-BAT burst
  84. GRB 060814: P60 Observations
  85. GRB 060814: P200 NIR Observations
  86. GRB 060814: source inside revised XRT error box
  87. GRB 060814: Possible IR counterpart
  88. GRB060805B: optical observations
  89. GRB060814: Swift/UVOT upper limits
  90. GRB 060813: pseudo-z from spectral parameters of the prompt
  91. GRB 060814: Swift XRT refined analysis
  92. GRB 060814: VLT optical limits
  93. GRB 060814 - SDSS Pre-Burst Observations
  94. GRB 060814: TAROT optical observations
  95. GRB 060814: Swift detection of a bright burst
  96. Konus-Wind observation of GRB 060813
  97. GRB060813: Swift/UVOT upper limits
  98. GRB 060813: Swift XRT refined analysis
  99. GRB 060813: Refined analysis of the Swift-BAT burst
  100. GRB 060813: Swift detection of a burst

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