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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"

28057 results found.

  1. GRB080603B: RTT150 optical observations, break in light curves
  2. GRB 080604: Swift detection of a burst with an optical afterglow
  3. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  4. GRB 080516: TAROT La Silla observatory optical observations
  5. GRB080603B: NOT redshift
  6. GRB 080603B: BOOTES2/TELMA optical observations
  7. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  8. GRB 080603B: Swift detection of a burst with optical afterglow
  9. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  10. GRB 080603: A long GRB detected by INTEGRAL
  11. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  12. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  13. GRB 080602, Swift-BAT refined analysis
  14. GRB 080602: Swift-XRT refined analysis
  15. Konus-Wind observation of GRB 080602
  16. GRB 080602: NOT R-band upper limit
  17. GRB 080602: Enhanced Swift-XRT position
  18. GRB 080602: Swift detection of a burst
  19. Swift analysis of BAT Slew Survey event (Trigger=009)
  20. GRB 080523: afterglow confirmation and redshift constraints
  21. Konus-Wind observation of reactivation of SGR 1627-41
  22. GRB 080524: Swift XRT and UVOT analysis
  23. GRB 080503: 2nd Epoch Chandra X-ray Observations
  24. GRB 080524: Swift-BAT detection of a burst in ground analysis
  25. GRB 080523: Swift-XRT refined analysis
  26. GRB 080523, Swift-BAT refined analysis
  27. GRB 080523: VLT optical observations
  28. GRB 080523: Enhanced Swift-XRT position
  29. GRB 080523: Swift detection of a burst
  30. GRB 080515: KPNO 4m NIR afterglow detection
  31. GRB 80516: Swift/UVOT Observations
  32. GRB 080515: Swift-XRT position and analysis
  33. GRB 080520, Swift-BAT refined analysis
  34. GRB 080514B: UVOT Observations
  35. GRB080520: Swift/UVOT observations
  36. GRB 080520, GROND observations
  37. GRB 080520: Enhanced Swift-XRT position
  38. GRB 080520: Swift XRT Refined Analysis
  39. GRB 080520: Swift detection of a burst with optical afterglow
  40. GRB 080514B: Suzaku WAM observation of the prompt emission
  41. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  42. GRB 080517, Swift-BAT refined analysis
  43. GRB 080517: Swift-XRT refined analysis
  44. GRB 080514B: Further NIR observations
  45. GRB 080517: Enhanced Swift-XRT position
  46. GRB080517: Liverpool Telescope Optical Observations
  47. GRB 080517: Swift detection of a burst
  48. GRB 080516, GROND 2nd epoch observations
  49. GRB 080516, GROND observations
  50. GRB 080516, SMARTS optical/IR observations
  51. GRB 080516: Swift-XRT Team refined analysis
  52. GRB 080516, Swift-BAT refined analysis
  53. GRB 080516: Enhanced Swift-XRT position
  54. GRB 080516: Swift detection of a burst
  55. Errartum: VLA upper limit on GRB 080507
  56. VLA upper limit on GRB 080705
  57. GRB 080514B : redshift estimation
  58. IPN triangulation of bright GRB 080513
  59. GRB 080515, Swift-BAT refined analysis
  60. GRB 080514B: slow fading behaviour ?
  61. GRB 080514B: Swift-XRT analysis
  62. GRB 080514B, GROND observations
  63. GRB 080515: Swift detection of a burst
  64. GRB 080514B: Afterglow candidate
  65. GRB 080514B: Watcher observations
  66. GRB 080514B: possible AGILE detection at E>50 MeV
  67. GRB 080514B: SuperAGILE/IPN GRB Localization
  68. procesure for GRB Circular
  69. Swift detection of a possible galactic transient
  70. GRB080514: REM NIR & Optical Observations
  71. GRB 080506: NAYUTA Optical Observation
  72. GRB 080507: Suzaku WAM observation of the prompt emission
  73. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  74. GRB 080507: Keck photometry
  75. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  76. GRB 080503: Hubble Space Telescope Imaging
  77. GRB 080507: Optical Afterglow
  78. GRB 080506:Optical observations from HCT
  79. GRB 080506: VLA radio upper limit
  80. GRB 080507: GRB localization by SuperAGILE
  81. GRB 080506: Swift XRT refined analysis
  82. GRB080506: Swift/UVOT observations
  83. GRB 080506, Swift-BAT refined analysis
  84. GRB080503, RIMOTS optical upper limit
  85. GRB 080506: Observations from NOT
  86. GRB 080506: Enhanced Swift-XRT position
  87. GRB 080506: Swift detection of a burst with optical afterglow
  88. GRB 080503: VLA radio upper limit
  89. GRB 080503: Observations from NOT
  90. GRB 080503: Slow-rise optical AG ?
  91. GRB 080430: TLS imaging one day after the GRB
  92. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  93. GRB080503 XRT refined analysis
  94. GRB 080503, Swift-BAT refined analysis
  95. GRB 080430
  96. GRB 080503: Enhanced Swift-XRT position
  97. GRB 080503: New candidate afterglow/host in Gemini imaging
  98. GRB 080503: Swift detection of a short burst
  99. GRB080430: Swift/UVOT observations
  100. VLA radio upper limit on GRB 080430

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