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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"

18653 results found.

  1. GRB 080603B : Liverpool Telescope Observations
  2. Konus-Wind observation of GRB 080603B
  3. GRB 080603B: Swift-XRT refined analysis
  4. GRB 080603A: Swift-XRT detection of the afterglow
  5. GRB 080603B: Swift/UVOT detection of the afterglow
  6. GRB 080604: Enhanced Swift-XRT position
  7. GRB 080603B, Swift-BAT refined analysis
  8. GRB 080603A: Swift/UVOT detection of the afterglow
  9. GRB080603B: RTT150 optical observations, break in light curves
  10. GRB 080604: Early Super-LOTIS Observations
  11. GRB 080604: Swift detection of a burst with an optical afterglow
  12. GRB 080516: TAROT La Silla observatory optical observations
  13. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  14. GRB 080603B: Swift detection of a burst with optical afterglow
  15. GRB 080603B: ROTSE-III Detection of Optical Counterpart
  16. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  17. GRB 080602, Swift-BAT refined analysis
  18. GRB 080602: Swift-XRT refined analysis
  19. Konus-Wind observation of GRB 080602
  20. GRB 080602: Enhanced Swift-XRT position
  21. GRB 080602: Swift detection of a burst
  22. Swift analysis of BAT Slew Survey event (Trigger=009)
  23. Konus-Wind observation of reactivation of SGR 1627-41
  24. Reactivation of SGR 1627-41
  25. GRB 080524: Swift XRT and UVOT analysis
  26. GRB 080524: Swift-BAT detection of a burst in ground analysis
  27. GRB 080523: Swift-XRT refined analysis
  28. GRB 080523, Swift-BAT refined analysis
  29. Swift/UVOT observations of GRB 080523
  30. GRB 080523: Enhanced Swift-XRT position
  31. GRB 080523: Swift detection of a burst
  32. GRB 80516: Swift/UVOT Observations
  33. GRB 080515: Swift-XRT position and analysis
  34. GRB 080520, Swift-BAT refined analysis
  35. GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
  36. GRB 080514B: UVOT Observations
  37. GRB080520: Swift/UVOT observations
  38. GRB 080520, GROND observations
  39. GRB 080520: Enhanced Swift-XRT position
  40. GRB 080520: Swift XRT Refined Analysis
  41. GRB 080520: Swift detection of a burst with optical afterglow
  42. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  43. GRB 080517, Swift-BAT refined analysis
  44. GRB 080517: Swift-XRT refined analysis
  45. GRB 080517: Enhanced Swift-XRT position
  46. GRB 080517: Swift detection of a burst
  47. GRB 080516, SMARTS optical/IR observations
  48. GRB 080516: Swift-XRT Team refined analysis
  49. GRB 080516, Swift-BAT refined analysis
  50. GRB 080516: Enhanced Swift-XRT position
  51. GRB 080516: Swift detection of a burst
  52. Errartum: VLA upper limit on GRB 080507
  53. VLA upper limit on GRB 080705
  54. IPN triangulation of bright GRB 080513
  55. Swift-BAT refined analysis for Trigger 311603: Galactic source
  56. GRB 080515, Swift-BAT refined analysis
  57. GRB 080514B: Swift-XRT analysis
  58. GRB 080515: Swift detection of a burst
  59. GRB 080514B: possible AGILE detection at E>50 MeV
  60. Swift detection of a possible galactic transient
  61. GRB 080507: Suzaku WAM observation of the prompt emission
  62. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  63. GRB 080507: Keck photometry
  64. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  65. GRB080507: Swift/UVOT followup observations
  66. GRB 080507: Swift-XRT position of a possible afterglow
  67. GRB 080506: VLA radio upper limit
  68. GRB 080506: TLS 2nd Epoch - possible light curve break
  69. GRB 080506: Swift XRT refined analysis
  70. GRB080506: Swift/UVOT observations
  71. GRB 080506, Swift-BAT refined analysis
  72. GRB080503, RIMOTS optical upper limit
  73. GRB 080506: TLS afterglow detection in VRIZ
  74. GRB 080506: Enhanced Swift-XRT position
  75. GRB 080506: Swift detection of a burst with optical afterglow
  76. GRB 080503, Swift-BAT lag and time-resolved spectral analysis
  77. GRB080503: Swift/UVOT Upper Limits
  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: Swift detection of a short burst
  83. GRB 080411: Continued Swift Monitoring
  84. GRB 080430: Optical observations
  85. GRB080430: Swift/UVOT observations
  86. GRB 080430 optical observations
  87. GRB 080430, Swift-BAT refined analysis
  88. GRB 080430: Swift-XRT refined analysis
  89. GRB 080430: Enhanced Swift-XRT position
  90. GRB 080430 - SDSS Pre-Burst Observations
  91. GRB 080430: Swift detection of a burst with optical afterglow
  92. GRB 080430: TAROT Calern observatory optical observations
  93. GRB 080426: Swift-XRT refined analysis
  94. GRB080426: Swift/UVOT upper limits
  95. GRB 080426: Enhanced Swift-XRT position
  96. GRB 080426, Swift-BAT refined analysis
  97. GRB 080426: Swift detection of a possibly short burst
  98. Possible GRB 080315: XRT non-detection of afterglow
  99. Swift-BAT trigger 309665 is not a GRB
  100. GRB 080420A: ROTSE-III Optical Limits on a possible short burst

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