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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"

23417 results found.

  1. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  2. GRB 080517, Swift-BAT refined analysis
  3. GRB 080517: Swift-XRT refined analysis
  4. GRB 080514B: Further NIR observations
  5. GRB 080517: Enhanced Swift-XRT position
  6. GRB080517: Liverpool Telescope Optical Observations
  7. GRB 080517: Swift detection of a burst
  8. GRB 080516, GROND 2nd epoch observations
  9. GRB 080516, GROND observations
  10. GRB 080516, SMARTS optical/IR observations
  11. GRB 080516: Swift-XRT Team refined analysis
  12. GRB 080516: Enhanced Swift-XRT position
  13. GRB 080516: Swift detection of a burst
  14. Errartum: VLA upper limit on GRB 080507
  15. VLA upper limit on GRB 080705
  16. IPN triangulation of bright GRB 080513
  17. GRB 080514B: slow fading behaviour ?
  18. GRB 080514B: Swift-XRT analysis
  19. GRB 080514B, GROND observations
  20. GRB 080515: Swift detection of a burst
  21. GRB 080514B: Watcher observations
  22. GRB 080514B: SuperAGILE/IPN GRB Localization
  23. procesure for GRB Circular
  24. Swift detection of a possible galactic transient
  25. GRB080514: REM NIR & Optical Observations
  26. GRB 080506: NAYUTA Optical Observation
  27. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  28. GRB 080507: Keck photometry
  29. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  30. GRB080507: Swift/UVOT followup observations
  31. GRB 080507: Optical Afterglow
  32. GRB 080506:Optical observations from HCT
  33. GRB 080506: VLA radio upper limit
  34. GRB 080507: GRB localization by SuperAGILE
  35. GRB 080506: Swift XRT refined analysis
  36. GRB080506: Swift/UVOT observations
  37. GRB 080506, Swift-BAT refined analysis
  38. GRB080503, RIMOTS optical upper limit
  39. GRB 080506: Observations from NOT
  40. GRB 080506: TLS afterglow detection in VRIZ
  41. GRB 080506: Enhanced Swift-XRT position
  42. GRB 080506: Swift detection of a burst with optical afterglow
  43. GRB 080503: VLA radio upper limit
  44. GRB 080503: Observations from NOT
  45. GRB 080430: TLS imaging one day after the GRB
  46. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  47. GRB 080503: MITSuME Ishigakijima optical upper limits
  48. GRB080503: Swift/UVOT Upper Limits
  49. GRB 080430
  50. GRB 080430
  51. GRB 080430
  52. GRB 080503: Enhanced Swift-XRT position
  53. GRB 080503: MITSuME Akeno optical upper limits
  54. GRB 080503: New candidate afterglow/host in Gemini imaging
  55. GRB 080503: Swift detection of a short burst
  56. GRB080430: RTT150 Optical Observations
  57. GRB080430: Swift/UVOT observations
  58. VLA radio upper limit on GRB 080430
  59. GRB 080430: Enhanced Swift-XRT position
  60. GRB 080430 - SDSS Pre-Burst Observations
  61. GRB 080430: Swift detection of a burst with optical afterglow
  62. GRB 080430: TAROT Calern observatory optical observations
  63. GRB960202B - on the association with SN 1996cr
  64. GRB 080426: Swift-XRT refined analysis
  65. GRB080426: Swift/UVOT upper limits
  66. GRB 080426: Enhanced Swift-XRT position
  67. GRB 080426: Swift detection of a possibly short burst
  68. Possible GRB 080315: XRT non-detection of afterglow
  69. GRB 080320 : Faulkes Telescope North Observations
  70. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  71. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  72. GRB 080420?: Swift detection of a possible short burst
  73. GRB080310, BVRcIc field calibration
  74. Swift XRT and UVOT observations of GRB080414
  75. GRB 080319B: Jet Break, Energetics, Supernova
  76. GRB 080413B: Faulkes Telescope South optical afterglow observations
  77. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  78. GRB 080414: RTT150 optical observations
  79. VLA radio observations of GRB 080413B
  80. VLA radio observations of GRB 080413A
  81. GRB080413B
  82. GRB 080413a, SMARTS optical/IR afterglow observations
  83. GRB080413A: Swift/UVOT observations
  84. GRB 080413A: Swift-XRT refined analysis
  85. GRB080413B: REM NIR & Optical Observation
  86. GRB 080413B: GROND detection of afterglow in all bands
  87. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  88. GRB 080413A: REM detection of the NIR Afterglow
  89. GRB 080413: Enhanced Swift-XRT position
  90. GRB 080413: TAROT Calern observatory optical observations
  91. GRB 080413: Swift detection of a burst with an optical afterglow
  92. GRB 080411: Swift/UVOT 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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