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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"

19863 results found.

  1. GRB 080604: Enhanced Swift-XRT position
  2. GRB 080603B, Swift-BAT refined analysis
  3. GRB080603B: RTT150 optical observations, break in light curves
  4. GRB 080604: Swift detection of a burst with an optical afterglow
  5. GRB 080603B: TAROT Calern observatory confirmation of slow optical decay
  6. GRB 080516: TAROT La Silla observatory optical observations
  7. GRB080603B: NOT redshift
  8. GRB 080603B: BOOTES2/TELMA optical observations
  9. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  10. GRB 080603B: Swift detection of a burst with optical afterglow
  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. GRB 080602: NOT R-band upper limit
  16. GRB 080602: Enhanced Swift-XRT position
  17. GRB 080602: Swift detection of a burst
  18. Swift analysis of BAT Slew Survey event (Trigger=009)
  19. GRB 080523: afterglow confirmation and redshift constraints
  20. GRB 080524: Swift XRT and UVOT analysis
  21. GRB 080503: 2nd Epoch Chandra X-ray Observations
  22. GRB 080523, Swift-BAT refined analysis
  23. GRB 080523: VLT optical observations
  24. GRB 080523: Enhanced Swift-XRT position
  25. GRB 080523: Swift detection of a burst
  26. GRB 080515: KPNO 4m NIR afterglow detection
  27. GRB 80516: Swift/UVOT Observations
  28. GRB 080515: Swift-XRT position and analysis
  29. GRB 080514B: UVOT Observations
  30. GRB080520: Swift/UVOT observations
  31. GRB 080520, GROND observations
  32. GRB 080520: Enhanced Swift-XRT position
  33. GRB 080520: Swift XRT Refined Analysis
  34. GRB 080520: Swift detection of a burst with optical afterglow
  35. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  36. GRB 080517, Swift-BAT refined analysis
  37. GRB 080514B: Further NIR observations
  38. GRB 080517: Enhanced Swift-XRT position
  39. GRB080517: Liverpool Telescope Optical Observations
  40. GRB 080517: Swift detection of a burst
  41. GRB 080516, GROND 2nd epoch observations
  42. GRB 080516, GROND observations
  43. GRB 080516, SMARTS optical/IR observations
  44. GRB 080516: Swift-XRT Team refined analysis
  45. GRB 080516: Enhanced Swift-XRT position
  46. GRB 080516: Swift detection of a burst
  47. Errartum: VLA upper limit on GRB 080507
  48. VLA upper limit on GRB 080705
  49. IPN triangulation of bright GRB 080513
  50. GRB 080514B: KPNO 4m IR observations
  51. GRB 080514B: slow fading behaviour ?
  52. GRB 080514B: Swift-XRT analysis
  53. GRB 080514B, GROND observations
  54. GRB 080515: Swift detection of a burst
  55. GRB 080514B: Watcher observations
  56. GRB 080514B: SuperAGILE/IPN GRB Localization
  57. procesure for GRB Circular
  58. Swift detection of a possible galactic transient
  59. GRB080514: REM NIR & Optical Observations
  60. GRB 080506: NAYUTA Optical Observation
  61. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  62. GRB 080507: Keck photometry
  63. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  64. GRB 080507: Optical Afterglow
  65. GRB 080506:Optical observations from HCT
  66. GRB 080506: VLA radio upper limit
  67. GRB080506: Swift/UVOT observations
  68. GRB 080506, Swift-BAT refined analysis
  69. GRB080503, RIMOTS optical upper limit
  70. GRB 080506: Observations from NOT
  71. GRB 080506: TLS afterglow detection in VRIZ
  72. GRB 080506: Enhanced Swift-XRT position
  73. GRB 080506: Swift detection of a burst with optical afterglow
  74. GRB 080503: VLA radio upper limit
  75. GRB 080503: Observations from NOT
  76. GRB 080430: TLS imaging one day after the GRB
  77. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  78. GRB080503 XRT refined analysis
  79. GRB 080503, Swift-BAT refined analysis
  80. GRB 080430
  81. GRB 080503: Enhanced Swift-XRT position
  82. GRB 080503: New candidate afterglow/host in Gemini imaging
  83. GRB 080503: Swift detection of a short burst
  84. GRB080430: Swift/UVOT observations
  85. VLA radio upper limit on GRB 080430
  86. GRB 080430: Enhanced Swift-XRT position
  87. GRB 080430 - SDSS Pre-Burst Observations
  88. GRB 080430: Swift detection of a burst with optical afterglow
  89. GRB 080430: TAROT Calern observatory optical observations
  90. GRB080426: Swift/UVOT upper limits
  91. GRB 080426: Enhanced Swift-XRT position
  92. GRB 080426: Swift detection of a possibly short burst
  93. Possible GRB 080315: XRT non-detection of afterglow
  94. GRB 080320 : Faulkes Telescope North Observations
  95. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  96. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  97. GRB080310, BVRcIc field calibration
  98. Swift XRT and UVOT observations of GRB080414
  99. GRB 080413B: Faulkes Telescope South optical afterglow observations
  100. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations

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