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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"

28033 results found.

  1. GRB 080523: Swift-XRT refined analysis
  2. GRB 080523, Swift-BAT refined analysis
  3. GRB 080523: VLT optical observations
  4. GRB 080523: Enhanced Swift-XRT position
  5. GRB 080523: Swift detection of a burst
  6. GRB 080515: KPNO 4m NIR afterglow detection
  7. GRB 80516: Swift/UVOT Observations
  8. GRB 080515: Swift-XRT position and analysis
  9. GRB 080520, Swift-BAT refined analysis
  10. GRB 080514B: UVOT Observations
  11. GRB080520: Swift/UVOT observations
  12. GRB 080520, GROND observations
  13. GRB 080520: Enhanced Swift-XRT position
  14. GRB 080520: Swift XRT Refined Analysis
  15. GRB 080520: Swift detection of a burst with optical afterglow
  16. GRB 080514B: Suzaku WAM observation of the prompt emission
  17. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  18. GRB 080517, Swift-BAT refined analysis
  19. GRB 080517: Swift-XRT refined analysis
  20. GRB 080514B: Further NIR observations
  21. GRB 080517: Enhanced Swift-XRT position
  22. GRB080517: Liverpool Telescope Optical Observations
  23. GRB 080517: Swift detection of a burst
  24. GRB 080516, GROND 2nd epoch observations
  25. GRB 080516, GROND observations
  26. GRB 080516, SMARTS optical/IR observations
  27. GRB 080516: Swift-XRT Team refined analysis
  28. GRB 080516, Swift-BAT refined analysis
  29. GRB 080516: Enhanced Swift-XRT position
  30. GRB 080516: Swift detection of a burst
  31. Errartum: VLA upper limit on GRB 080507
  32. VLA upper limit on GRB 080705
  33. GRB 080514B : redshift estimation
  34. IPN triangulation of bright GRB 080513
  35. GRB 080515, Swift-BAT refined analysis
  36. GRB 080514B: slow fading behaviour ?
  37. GRB 080514B: Swift-XRT analysis
  38. GRB 080514B, GROND observations
  39. GRB 080515: Swift detection of a burst
  40. GRB 080514B: Afterglow candidate
  41. GRB 080514B: Watcher observations
  42. GRB 080514B: possible AGILE detection at E>50 MeV
  43. GRB 080514B: SuperAGILE/IPN GRB Localization
  44. procesure for GRB Circular
  45. Swift detection of a possible galactic transient
  46. GRB080514: REM NIR & Optical Observations
  47. GRB 080506: NAYUTA Optical Observation
  48. GRB 080507: Suzaku WAM observation of the prompt emission
  49. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  50. GRB 080507: Keck photometry
  51. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  52. GRB 080503: Hubble Space Telescope Imaging
  53. GRB 080507: Optical Afterglow
  54. GRB 080506:Optical observations from HCT
  55. GRB 080506: VLA radio upper limit
  56. GRB 080507: GRB localization by SuperAGILE
  57. GRB 080506: Swift XRT refined analysis
  58. GRB080506: Swift/UVOT observations
  59. GRB 080506, Swift-BAT refined analysis
  60. GRB080503, RIMOTS optical upper limit
  61. GRB 080506: Observations from NOT
  62. GRB 080506: Enhanced Swift-XRT position
  63. GRB 080506: Swift detection of a burst with optical afterglow
  64. GRB 080503: VLA radio upper limit
  65. GRB 080503: Observations from NOT
  66. GRB 080503: Slow-rise optical AG ?
  67. GRB 080430: TLS imaging one day after the GRB
  68. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  69. GRB080503 XRT refined analysis
  70. GRB 080503, Swift-BAT refined analysis
  71. GRB 080430
  72. GRB 080503: Enhanced Swift-XRT position
  73. GRB 080503: New candidate afterglow/host in Gemini imaging
  74. GRB 080503: Swift detection of a short burst
  75. GRB080430: Swift/UVOT observations
  76. VLA radio upper limit on GRB 080430
  77. GRB 080430, Swift-BAT refined analysis
  78. GRB 080430: Swift-XRT refined analysis
  79. GRB 080430: Enhanced Swift-XRT position
  80. GRB 080430: Spectroscopy from CAHA
  81. GRB 080430 - SDSS Pre-Burst Observations
  82. GRB 080430: Bootes observation
  83. GRB 080430: Swift detection of a burst with optical afterglow
  84. GRB 080430: TAROT Calern observatory optical observations
  85. GRB 080426: Swift-XRT refined analysis
  86. GRB080426: Swift/UVOT upper limits
  87. GRB 080426: Enhanced Swift-XRT position
  88. GRB 080426, Swift-BAT refined analysis
  89. GRB 080426: Swift detection of a possibly short burst
  90. Possible GRB 080315: XRT non-detection of afterglow
  91. GRB 080320 : Faulkes Telescope North Observations
  92. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  93. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  94. GRB080310, BVRcIc field calibration
  95. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  96. Swift XRT and UVOT observations of GRB080414
  97. GRB 080319B: Jet Break, Energetics, Supernova
  98. GRB 080413B: Faulkes Telescope South optical afterglow observations
  99. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  100. GRB 080413A: Suzaku WAM observation of the prompt emission

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