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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"

19198 results found.

  1. GRB 080515, Swift-BAT refined analysis
  2. GRB 080514B: Swift-XRT analysis
  3. GRB 080515: Swift detection of a burst
  4. GRB 080514B: possible AGILE detection at E>50 MeV
  5. Swift detection of a possible galactic transient
  6. GRB 080507: Suzaku WAM observation of the prompt emission
  7. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  8. GRB 080507: Keck photometry
  9. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  10. GRB080507: Swift/UVOT followup observations
  11. GRB 080507: Swift-XRT position of a possible afterglow
  12. GRB 080506: VLA radio upper limit
  13. GRB 080506: TLS 2nd Epoch - possible light curve break
  14. GRB 080506: Swift XRT refined analysis
  15. GRB080506: Swift/UVOT observations
  16. GRB 080506, Swift-BAT refined analysis
  17. GRB080503, RIMOTS optical upper limit
  18. GRB 080506: TLS afterglow detection in VRIZ
  19. GRB 080506: Enhanced Swift-XRT position
  20. GRB 080506: Swift detection of a burst with optical afterglow
  21. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  22. GRB080503: Swift/UVOT Upper Limits
  23. GRB080503 XRT refined analysis
  24. GRB 080503, Swift-BAT refined analysis
  25. GRB 080430
  26. GRB 080503: Enhanced Swift-XRT position
  27. GRB 080503: Swift detection of a short burst
  28. GRB 080411: Continued Swift Monitoring
  29. GRB 080430: Optical observations
  30. GRB080430: Swift/UVOT observations
  31. GRB 080430 optical observations
  32. GRB 080430, Swift-BAT refined analysis
  33. GRB 080430: Swift-XRT refined analysis
  34. GRB 080430: Enhanced Swift-XRT position
  35. GRB 080430 - SDSS Pre-Burst Observations
  36. GRB 080430: Swift detection of a burst with optical afterglow
  37. GRB 080430: TAROT Calern observatory optical observations
  38. GRB 080426: Swift-XRT refined analysis
  39. GRB080426: Swift/UVOT upper limits
  40. GRB 080426: Enhanced Swift-XRT position
  41. GRB 080426, Swift-BAT refined analysis
  42. GRB 080426: Swift detection of a possibly short burst
  43. Possible GRB 080315: XRT non-detection of afterglow
  44. Swift-BAT trigger 309665 is not a GRB
  45. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  46. GRB 080420?: Swift detection of a possible short burst
  47. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  48. Swift XRT and UVOT observations of GRB080414
  49. GRB 080319B: Jet Break, Energetics, Supernova
  50. GRB 080413A: Suzaku WAM observation of the prompt emission
  51. GRB 080413B: Suzaku WAM observation of the prompt emission
  52. GRB 080413B: Ep,i-Eiso correlation
  53. GRB080413B
  54. Swift-BAT spectral lag analysis of GRB 080413B
  55. GRB 080413B: Swift XRT refined analysis
  56. GRB080413A: Swift/UVOT observations
  57. GRB 080413B, Swift-BAT refined analysis
  58. GRB 080413A: Swift-XRT refined analysis
  59. GRB 080413A, Swift-BAT refined analysis
  60. GRB 080413B: GROND detection of afterglow in all bands
  61. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  62. GRB 080413: Enhanced Swift-XRT position
  63. GRB 080413: TAROT Calern observatory optical observations
  64. GRB 080413: Swift detection of a burst with an optical afterglow
  65. GRB 080413: ROTSE-III Detection of Optical Counterpart
  66. GRB 080411: Swift/UVOT refined analysis
  67. GRB 080411, Swift-BAT refined analysis
  68. GRB 080411: Swift-XRT Refined Analysis
  69. Konus-Wind observation of GRB 080411
  70. GRB 080411: Enhanced Swift-XRT position
  71. GRB 080411: Swift detection of a bright burst
  72. GRB 080330: Swift-XRT refined position retraction
  73. GRB 080409: Swift-BAT refined analysis
  74. Swift/UVOT observations of GRB080409
  75. GRB 080409: Swift XRT refined analysis
  76. UVOT/Swift Observations of GRB080408
  77. GRB 080408: Swift-XRT position of a possible afterglow
  78. GRB 080409: Enhanced Swift-XRT position
  79. GRB 080409: Swift detection of a burst
  80. GRB 080319A: Early RAPTOR optical limits
  81. GRB 080330: RAPTOR detection of prompt optical flash
  82. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  83. GRB 080405: Swift-BAT refined analysis
  84. GRB 080405: Swift-XRT position
  85. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  86. GRB 080325: optical upper limit
  87. GRB080330: Improved Swift XRT Position
  88. GRB080328, RIMOTS optical upper limit
  89. GRB080330: Swift XRT refined analysis
  90. GRB 080330 Swift-UVOT refined analysis
  91. GRB 080328: Suzaku WAM observation of the prompt emission
  92. GRB 080330, Swift-BAT refined analysis
  93. Konus-Wind observation of GRB 080328
  94. GRB 080330: GROND Observations
  95. GRB 080330: TAROT Calern observatory optical observations
  96. GRB 080330: error in reported XRT position
  97. GRB080330 - SDSS Pre-Burst Observations
  98. GRB 080330: Liverpool Telescope Optical observations
  99. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  100. GRB 080330: Swift detection of a burst with an optical counterpart

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