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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"

19530 results found.

  1. Reactivation of SGR 1627-41
  2. GRB 080524: Swift XRT and UVOT analysis
  3. GRB 080524: Swift-BAT detection of a burst in ground analysis
  4. GRB 080523: Swift-XRT refined analysis
  5. GRB 080523, Swift-BAT refined analysis
  6. Swift/UVOT observations of GRB 080523
  7. GRB 080523: Enhanced Swift-XRT position
  8. GRB 080523: Swift detection of a burst
  9. GRB 80516: Swift/UVOT Observations
  10. GRB 080515: Swift-XRT position and analysis
  11. GRB 080520, Swift-BAT refined analysis
  12. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  13. GRB 080514B: UVOT Observations
  14. GRB080520: Swift/UVOT observations
  15. GRB 080520, GROND observations
  16. GRB 080520: Enhanced Swift-XRT position
  17. GRB 080520: Swift XRT Refined Analysis
  18. GRB 080520: Swift detection of a burst with optical afterglow
  19. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  20. GRB 080517, Swift-BAT refined analysis
  21. GRB 080517: Swift-XRT refined analysis
  22. GRB 080517: Enhanced Swift-XRT position
  23. GRB 080517: Swift detection of a burst
  24. GRB 080516, SMARTS optical/IR observations
  25. GRB 080516: Swift-XRT Team refined analysis
  26. GRB 080516, Swift-BAT refined analysis
  27. GRB 080516: Enhanced Swift-XRT position
  28. GRB 080516: Swift detection of a burst
  29. Errartum: VLA upper limit on GRB 080507
  30. VLA upper limit on GRB 080705
  31. IPN triangulation of bright GRB 080513
  32. Swift-BAT refined analysis for Trigger 311603: Galactic source
  33. GRB 080515, Swift-BAT refined analysis
  34. GRB 080514B: Swift-XRT analysis
  35. GRB 080515: Swift detection of a burst
  36. GRB 080514B: possible AGILE detection at E>50 MeV
  37. Swift detection of a possible galactic transient
  38. GRB 080507: Suzaku WAM observation of the prompt emission
  39. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  40. GRB 080507: Keck photometry
  41. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  42. GRB080507: Swift/UVOT followup observations
  43. GRB 080507: Swift-XRT position of a possible afterglow
  44. GRB 080506: VLA radio upper limit
  45. GRB 080506: TLS 2nd Epoch - possible light curve break
  46. GRB 080506: Swift XRT refined analysis
  47. GRB080506: Swift/UVOT observations
  48. GRB 080506, Swift-BAT refined analysis
  49. GRB080503, RIMOTS optical upper limit
  50. GRB 080506: TLS afterglow detection in VRIZ
  51. GRB 080506: Enhanced Swift-XRT position
  52. GRB 080506: Swift detection of a burst with optical afterglow
  53. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  54. GRB080503: Swift/UVOT Upper Limits
  55. GRB080503 XRT refined analysis
  56. GRB 080503, Swift-BAT refined analysis
  57. GRB 080430
  58. GRB 080503: Enhanced Swift-XRT position
  59. GRB 080503: Swift detection of a short burst
  60. GRB 080411: Continued Swift Monitoring
  61. GRB 080430: Optical observations
  62. GRB080430: Swift/UVOT observations
  63. GRB 080430 optical observations
  64. GRB 080430, Swift-BAT refined analysis
  65. GRB 080430: Swift-XRT refined analysis
  66. GRB 080430: Enhanced Swift-XRT position
  67. GRB 080430 - SDSS Pre-Burst Observations
  68. GRB 080430: Swift detection of a burst with optical afterglow
  69. GRB 080430: TAROT Calern observatory optical observations
  70. GRB 080426: Swift-XRT refined analysis
  71. GRB080426: Swift/UVOT upper limits
  72. GRB 080426: Enhanced Swift-XRT position
  73. GRB 080426, Swift-BAT refined analysis
  74. GRB 080426: Swift detection of a possibly short burst
  75. Possible GRB 080315: XRT non-detection of afterglow
  76. Swift-BAT trigger 309665 is not a GRB
  77. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  78. GRB 080420?: Swift detection of a possible short burst
  79. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  80. Swift XRT and UVOT observations of GRB080414
  81. GRB 080319B: Jet Break, Energetics, Supernova
  82. GRB 080413A: Suzaku WAM observation of the prompt emission
  83. GRB 080413B: Suzaku WAM observation of the prompt emission
  84. GRB 080413B: Ep,i-Eiso correlation
  85. GRB080413B
  86. Swift-BAT spectral lag analysis of GRB 080413B
  87. GRB 080413B: Swift XRT refined analysis
  88. GRB080413A: Swift/UVOT observations
  89. GRB 080413B, Swift-BAT refined analysis
  90. GRB 080413A: Swift-XRT refined analysis
  91. GRB 080413A, Swift-BAT refined analysis
  92. GRB 080413B: GROND detection of afterglow in all bands
  93. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  94. GRB 080413: Enhanced Swift-XRT position
  95. GRB 080413: TAROT Calern observatory optical observations
  96. GRB 080413: Swift detection of a burst with an optical afterglow
  97. GRB 080413: ROTSE-III Detection of Optical Counterpart
  98. GRB 080411: Swift/UVOT refined analysis
  99. GRB 080411, Swift-BAT refined analysis
  100. GRB 080411: Swift-XRT Refined Analysis

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