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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"

28039 results found.

  1. Swift analysis of BAT Slew Survey event (Trigger=009)
  2. GRB 080523: afterglow confirmation and redshift constraints
  3. Konus-Wind observation of reactivation of SGR 1627-41
  4. GRB 080524: Swift XRT and UVOT analysis
  5. GRB 080503: 2nd Epoch Chandra X-ray Observations
  6. GRB 080524: Swift-BAT detection of a burst in ground analysis
  7. GRB 080523: Swift-XRT refined analysis
  8. GRB 080523, Swift-BAT refined analysis
  9. GRB 080523: VLT optical observations
  10. GRB 080523: Enhanced Swift-XRT position
  11. GRB 080523: Swift detection of a burst
  12. GRB 080515: KPNO 4m NIR afterglow detection
  13. GRB 80516: Swift/UVOT Observations
  14. GRB 080515: Swift-XRT position and analysis
  15. GRB 080520, Swift-BAT refined analysis
  16. GRB 080514B: UVOT Observations
  17. GRB080520: Swift/UVOT observations
  18. GRB 080520, GROND observations
  19. GRB 080520: Enhanced Swift-XRT position
  20. GRB 080520: Swift XRT Refined Analysis
  21. GRB 080520: Swift detection of a burst with optical afterglow
  22. GRB 080514B: Suzaku WAM observation of the prompt emission
  23. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  24. GRB 080517, Swift-BAT refined analysis
  25. GRB 080517: Swift-XRT refined analysis
  26. GRB 080514B: Further NIR observations
  27. GRB 080517: Enhanced Swift-XRT position
  28. GRB080517: Liverpool Telescope Optical Observations
  29. GRB 080517: Swift detection of a burst
  30. GRB 080516, GROND 2nd epoch observations
  31. GRB 080516, GROND observations
  32. GRB 080516, SMARTS optical/IR observations
  33. GRB 080516: Swift-XRT Team refined analysis
  34. GRB 080516, Swift-BAT refined analysis
  35. GRB 080516: Enhanced Swift-XRT position
  36. GRB 080516: Swift detection of a burst
  37. Errartum: VLA upper limit on GRB 080507
  38. VLA upper limit on GRB 080705
  39. GRB 080514B : redshift estimation
  40. IPN triangulation of bright GRB 080513
  41. GRB 080515, Swift-BAT refined analysis
  42. GRB 080514B: slow fading behaviour ?
  43. GRB 080514B: Swift-XRT analysis
  44. GRB 080514B, GROND observations
  45. GRB 080515: Swift detection of a burst
  46. GRB 080514B: Afterglow candidate
  47. GRB 080514B: Watcher observations
  48. GRB 080514B: possible AGILE detection at E>50 MeV
  49. GRB 080514B: SuperAGILE/IPN GRB Localization
  50. procesure for GRB Circular
  51. Swift detection of a possible galactic transient
  52. GRB080514: REM NIR & Optical Observations
  53. GRB 080506: NAYUTA Optical Observation
  54. GRB 080507: Suzaku WAM observation of the prompt emission
  55. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  56. GRB 080507: Keck photometry
  57. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  58. GRB 080503: Hubble Space Telescope Imaging
  59. GRB 080507: Optical Afterglow
  60. GRB 080506:Optical observations from HCT
  61. GRB 080506: VLA radio upper limit
  62. GRB 080507: GRB localization by SuperAGILE
  63. GRB 080506: Swift XRT refined analysis
  64. GRB080506: Swift/UVOT observations
  65. GRB 080506, Swift-BAT refined analysis
  66. GRB080503, RIMOTS optical upper limit
  67. GRB 080506: Observations from NOT
  68. GRB 080506: Enhanced Swift-XRT position
  69. GRB 080506: Swift detection of a burst with optical afterglow
  70. GRB 080503: VLA radio upper limit
  71. GRB 080503: Observations from NOT
  72. GRB 080503: Slow-rise optical AG ?
  73. GRB 080430: TLS imaging one day after the GRB
  74. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  75. GRB080503 XRT refined analysis
  76. GRB 080503, Swift-BAT refined analysis
  77. GRB 080430
  78. GRB 080503: Enhanced Swift-XRT position
  79. GRB 080503: New candidate afterglow/host in Gemini imaging
  80. GRB 080503: Swift detection of a short burst
  81. GRB080430: Swift/UVOT observations
  82. VLA radio upper limit on GRB 080430
  83. GRB 080430, Swift-BAT refined analysis
  84. GRB 080430: Swift-XRT refined analysis
  85. GRB 080430: Enhanced Swift-XRT position
  86. GRB 080430: Spectroscopy from CAHA
  87. GRB 080430 - SDSS Pre-Burst Observations
  88. GRB 080430: Bootes observation
  89. GRB 080430: Swift detection of a burst with optical afterglow
  90. GRB 080430: TAROT Calern observatory optical observations
  91. GRB 080426: Swift-XRT refined analysis
  92. GRB080426: Swift/UVOT upper limits
  93. GRB 080426: Enhanced Swift-XRT position
  94. GRB 080426, Swift-BAT refined analysis
  95. GRB 080426: Swift detection of a possibly short burst
  96. Possible GRB 080315: XRT non-detection of afterglow
  97. GRB 080320 : Faulkes Telescope North Observations
  98. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  99. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  100. GRB080310, BVRcIc field calibration

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