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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"

19264 results found.

  1. GRB 080605: Enhanced Swift-XRT position
  2. GRB 080605: GROND detection of the optical afterglow candidate
  3. GRB080605: optical observations
  4. GRB 080605: Liverpool Telescope optical afterglow candidate
  5. GRB 080605: Swift/UVOT Position of the Optical Afterglow
  6. GRB 080605: TLS RRM Afterglow
  7. GRB 080605: Swift detection of a burst with an optical afterglow
  8. GRB 080603B: TLS Afterglow Observation
  9. Swift/UVOT observations of GRB080604
  10. GRB 080604, Swift-BAT refined analysis
  11. GRB 080604: Swift-XRT refined analysis
  12. GRB 080603B : Liverpool Telescope Observations
  13. Konus-Wind observation of GRB 080603B
  14. GRB 080603B: Swift-XRT refined analysis
  15. GRB 080603A: Swift-XRT detection of the afterglow
  16. GRB 080603B: Swift/UVOT detection of the afterglow
  17. GRB 080604: Enhanced Swift-XRT position
  18. GRB 080603B, Swift-BAT refined analysis
  19. GRB 080603A: Swift/UVOT detection of the afterglow
  20. GRB080603B: RTT150 optical observations, break in light curves
  21. GRB 080604: Early Super-LOTIS Observations
  22. GRB 080604: Swift detection of a burst with an optical afterglow
  23. GRB 080516: TAROT La Silla observatory optical observations
  24. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  25. GRB 080603B: Swift detection of a burst with optical afterglow
  26. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  27. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  28. GRB 080602, Swift-BAT refined analysis
  29. GRB 080602: Swift-XRT refined analysis
  30. Konus-Wind observation of GRB 080602
  31. GRB 080602: Enhanced Swift-XRT position
  32. GRB 080602: Swift detection of a burst
  33. Swift analysis of BAT Slew Survey event (Trigger=009)
  34. Konus-Wind observation of reactivation of SGR 1627-41
  35. Reactivation of SGR 1627-41
  36. GRB 080524: Swift XRT and UVOT analysis
  37. GRB 080524: Swift-BAT detection of a burst in ground analysis
  38. GRB 080523: Swift-XRT refined analysis
  39. GRB 080523, Swift-BAT refined analysis
  40. Swift/UVOT observations of GRB 080523
  41. GRB 080523: Enhanced Swift-XRT position
  42. GRB 080523: Swift detection of a burst
  43. GRB 80516: Swift/UVOT Observations
  44. GRB 080515: Swift-XRT position and analysis
  45. GRB 080520, Swift-BAT refined analysis
  46. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  47. GRB 080514B: UVOT Observations
  48. GRB080520: Swift/UVOT observations
  49. GRB 080520, GROND observations
  50. GRB 080520: Enhanced Swift-XRT position
  51. GRB 080520: Swift XRT Refined Analysis
  52. GRB 080520: Swift detection of a burst with optical afterglow
  53. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  54. GRB 080517, Swift-BAT refined analysis
  55. GRB 080517: Swift-XRT refined analysis
  56. GRB 080517: Enhanced Swift-XRT position
  57. GRB 080517: Swift detection of a burst
  58. GRB 080516, SMARTS optical/IR observations
  59. GRB 080516: Swift-XRT Team refined analysis
  60. GRB 080516, Swift-BAT refined analysis
  61. GRB 080516: Enhanced Swift-XRT position
  62. GRB 080516: Swift detection of a burst
  63. Errartum: VLA upper limit on GRB 080507
  64. VLA upper limit on GRB 080705
  65. IPN triangulation of bright GRB 080513
  66. Swift-BAT refined analysis for Trigger 311603: Galactic source
  67. GRB 080515, Swift-BAT refined analysis
  68. GRB 080514B: Swift-XRT analysis
  69. GRB 080515: Swift detection of a burst
  70. GRB 080514B: possible AGILE detection at E>50 MeV
  71. Swift detection of a possible galactic transient
  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. GRB080507: Swift/UVOT followup observations
  77. GRB 080507: Swift-XRT position of a possible afterglow
  78. GRB 080506: VLA radio upper limit
  79. GRB 080506: TLS 2nd Epoch - possible light curve break
  80. GRB 080506: Swift XRT refined analysis
  81. GRB080506: Swift/UVOT observations
  82. GRB 080506, Swift-BAT refined analysis
  83. GRB080503, RIMOTS optical upper limit
  84. GRB 080506: TLS afterglow detection in VRIZ
  85. GRB 080506: Enhanced Swift-XRT position
  86. GRB 080506: Swift detection of a burst with optical afterglow
  87. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  88. GRB080503: Swift/UVOT Upper Limits
  89. GRB080503 XRT refined analysis
  90. GRB 080503, Swift-BAT refined analysis
  91. GRB 080430
  92. GRB 080503: Enhanced Swift-XRT position
  93. GRB 080503: Swift detection of a short burst
  94. GRB 080411: Continued Swift Monitoring
  95. GRB 080430: Optical observations
  96. GRB080430: Swift/UVOT observations
  97. GRB 080430 optical observations
  98. GRB 080430, Swift-BAT refined analysis
  99. GRB 080430: Swift-XRT refined analysis
  100. GRB 080430: Enhanced Swift-XRT position

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