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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"

27401 results found.

  1. GRB 080514B : redshift estimation
  2. IPN triangulation of bright GRB 080513
  3. GRB 080515, Swift-BAT refined analysis
  4. GRB 080514B: slow fading behaviour ?
  5. GRB 080514B: Swift-XRT analysis
  6. GRB 080514B, GROND observations
  7. GRB 080515: Swift detection of a burst
  8. GRB 080514B: Afterglow candidate
  9. GRB 080514B: Watcher observations
  10. GRB 080514B: possible AGILE detection at E>50 MeV
  11. GRB 080514B: SuperAGILE/IPN GRB Localization
  12. procesure for GRB Circular
  13. Swift detection of a possible galactic transient
  14. GRB080514: REM NIR & Optical Observations
  15. GRB 080506: NAYUTA Optical Observation
  16. GRB 080507: Suzaku WAM observation of the prompt emission
  17. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  18. GRB 080507: Keck photometry
  19. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  20. GRB 080503: Hubble Space Telescope Imaging
  21. GRB 080507: Optical Afterglow
  22. GRB 080506:Optical observations from HCT
  23. GRB 080506: VLA radio upper limit
  24. GRB 080507: GRB localization by SuperAGILE
  25. GRB 080506: Swift XRT refined analysis
  26. GRB080506: Swift/UVOT observations
  27. GRB 080506, Swift-BAT refined analysis
  28. GRB080503, RIMOTS optical upper limit
  29. GRB 080506: Observations from NOT
  30. GRB 080506: Enhanced Swift-XRT position
  31. GRB 080506: Swift detection of a burst with optical afterglow
  32. GRB 080503: VLA radio upper limit
  33. GRB 080503: Observations from NOT
  34. GRB 080503: Slow-rise optical AG ?
  35. GRB 080430: TLS imaging one day after the GRB
  36. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  37. GRB080503 XRT refined analysis
  38. GRB 080503, Swift-BAT refined analysis
  39. GRB 080430
  40. GRB 080503: Enhanced Swift-XRT position
  41. GRB 080503: New candidate afterglow/host in Gemini imaging
  42. GRB 080503: Swift detection of a short burst
  43. GRB080430: Swift/UVOT observations
  44. VLA radio upper limit on GRB 080430
  45. GRB 080430, Swift-BAT refined analysis
  46. GRB 080430: Swift-XRT refined analysis
  47. GRB 080430: Enhanced Swift-XRT position
  48. GRB 080430: Spectroscopy from CAHA
  49. GRB 080430 - SDSS Pre-Burst Observations
  50. GRB 080430: Bootes observation
  51. GRB 080430: Swift detection of a burst with optical afterglow
  52. GRB 080430: TAROT Calern observatory optical observations
  53. GRB 080426: Swift-XRT refined analysis
  54. GRB080426: Swift/UVOT upper limits
  55. GRB 080426: Enhanced Swift-XRT position
  56. GRB 080426, Swift-BAT refined analysis
  57. GRB 080426: Swift detection of a possibly short burst
  58. Possible GRB 080315: XRT non-detection of afterglow
  59. GRB 080320 : Faulkes Telescope North Observations
  60. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  61. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  62. GRB080310, BVRcIc field calibration
  63. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  64. Swift XRT and UVOT observations of GRB080414
  65. GRB 080319B: Jet Break, Energetics, Supernova
  66. GRB 080413B: Faulkes Telescope South optical afterglow observations
  67. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  68. GRB 080413A: Suzaku WAM observation of the prompt emission
  69. GRB 080413B: Suzaku WAM observation of the prompt emission
  70. GRB 080414: RTT150 optical observations
  71. GRB 080414: A long GRB detected by INTEGRAL
  72. VLA radio observations of GRB 080413B
  73. VLA radio observations of GRB 080413A
  74. GRB 080413B: Ep,i-Eiso correlation
  75. GRB080413B
  76. Swift-BAT spectral lag analysis of GRB 080413B
  77. GRB 080413a, SMARTS optical/IR afterglow observations
  78. GRB080413A: Swift/UVOT observations
  79. GRB 080413B, Swift-BAT refined analysis
  80. GRB 080413A: Swift-XRT refined analysis
  81. GRB 080413A, Swift-BAT refined analysis
  82. GRB 080413A Bootes observation
  83. GRB080413B: REM NIR & Optical Observation
  84. GRB 080413B: GROND detection of afterglow in all bands
  85. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  86. GRB 080413A: REM detection of the NIR Afterglow
  87. GRB 080413: Enhanced Swift-XRT position
  88. GRB 080413: TAROT Calern observatory optical observations
  89. GRB 080413: Swift detection of a burst with an optical afterglow
  90. GRB 080413: ROTSE-III Detection of Optical Counterpart
  91. GRB 080411: Swift/UVOT refined analysis
  92. GRB 080411, Swift-BAT refined analysis
  93. GRB 080411: Swift-XRT Refined Analysis
  94. GRB 080411: Enhanced Swift-XRT position
  95. GRB 080411: GROND detection of optical afterglow candidate
  96. GRB 080411: Swift detection of a bright burst
  97. GRB 080409: Swift-BAT refined analysis
  98. GRB 080408: GROND detection of optical/NIR afterglow candidate
  99. GRB 080330 optical observations
  100. Swift/UVOT observations of GRB080409

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