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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

11078 results found.

  1. GRB 080516: TAROT La Silla observatory optical observations
  2. GRB 080603B: BOOTES2/TELMA optical observations
  3. GRB 080603: A long GRB detected by INTEGRAL
  4. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  5. Konus-Wind observation of GRB 080602
  6. Swift analysis of BAT Slew Survey event (Trigger=009)
  7. Konus-Wind observation of reactivation of SGR 1627-41
  8. Reactivation of SGR 1627-41
  9. GRB 080515: KPNO 4m NIR afterglow detection
  10. GRB 080515: Swift-XRT position and analysis
  11. GRB 080520, GROND observations
  12. GRB 080520: Swift XRT Refined Analysis
  13. GRB 080520: Swift detection of a burst with optical afterglow
  14. Konus-Wind observation of GRB 080514B
  15. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  16. GRB 080517: Swift detection of a burst
  17. GRB 080516: Swift detection of a burst
  18. Konus-Wind observation of GRB 080513
  19. IPN triangulation of bright GRB 080513
  20. GRB 080514B: KPNO 4m IR observations
  21. GRB 080514B: slow fading behaviour ?
  22. GRB 080514B: Swift-XRT analysis
  23. GRB 080514B: SuperAGILE/IPN GRB Localization
  24. Konus-Wind observation of GRB 080507
  25. GRB 080507: E Pur Si Muove!
  26. GRB 080503: Hubble Space Telescope Imaging
  27. GRB 080506:Optical observations from HCT
  28. GRB 080507: GRB localization by SuperAGILE
  29. GRB 080506, Swift-BAT refined analysis
  30. GRB 080503, Swift-BAT refined analysis
  31. GRB 080430
  32. GRB 080430
  33. GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
  34. GRB 080503: Swift detection of a short burst
  35. GRB 080430 optical observations
  36. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  37. GRB 080430: Bootes observation
  38. GRB 080430: Swift detection of a burst with optical afterglow
  39. GRB 080320 : Faulkes Telescope North Observations
  40. Swift-BAT trigger 309665 is not a GRB
  41. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  42. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  43. GRB 080414: RTT150 optical observations
  44. GRB 080414: A long GRB detected by INTEGRAL
  45. GRB 080413B: Swift XRT refined analysis
  46. GRB 080413B, Swift-BAT refined analysis
  47. GRB 080413A: Swift-XRT refined analysis
  48. GRB 080413A Bootes observation
  49. GRB 080411: Swift-XRT Refined Analysis
  50. Konus-Wind observation of GRB 080411
  51. GRB 080411: Swift detection of a bright burst
  52. GRB 080330 optical observations
  53. GRB 080408: GRB Localization by SuperAGILE
  54. GRB 080405: Swift-BAT refined analysis
  55. GRB 080330, SMARTS optical/IR afterglow observations
  56. Konus-Wind observation of GRB 080328
  57. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  58. GRB 080325, Swift-BAT refined analysis
  59. GRB 080325: GROND Observations
  60. GRB080319B: optical observations
  61. GRB 080325: Early observations from OSN
  62. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  63. GRB 080319D: optical upper limit
  64. GRB 080319B - CARMA mm Observations
  65. GRB 080320: J detection with FLAMINGOS
  66. GRB 080319D: Swift XRT refined analysis
  67. Konus-Wind observation of GRB 080319C
  68. GRB 080319B: Gemini-South photometry
  69. GRB 080319B: Allen Telescope Array Observations
  70. Konus-Wind observation of GRB 080319B
  71. GRB 080319B: WSRT Radio Observations
  72. GRB 080320: Swift detection of a burst
  73. GRB 080320: ROTSE-III Optical Limits
  74. GRB 080319C: Swift detection of a burst with an optical afterglow
  75. GRB 080319B: Change in power law decay index
  76. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  77. Swift trigger 306323: Swift-BAT/XRT refined analysis
  78. GRB080310: Optical observation by MITSuME telescope
  79. GRB 080310, Swift-BAT refined analysis
  80. GRB080307: optical upper limit
  81. GRB080310 : Lulin optical observation
  82. GRB 080310: RRM optical photometry with the VLT
  83. GRB 080310, SMARTS optical/IR afterglow observations
  84. GRB080307, optical upper limit
  85. GRB080229, optical upper limit
  86. GRB080307: Optical upper limits
  87. GRB 080307, Preliminary Swift-BAT refined analysis
  88. GRB 080303, Swift-BAT refined analysis
  89. GRB 080303A: ROTSE-III Optical Limits
  90. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  91. GRB 080229A: ROTSE-III Optical Limits
  92. GRB 080229: Swift detection of a bright burst
  93. GRB080207: optical observations
  94. Swift-XRT improved positions, and new redshift limits.
  95. GRB 080218B: GROND upper limits
  96. GRB 080218: Swift detection of a burst
  97. Konus-Wind observation of GRB 080211
  98. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  99. GRB 080212: GROND detects afterglow
  100. GRB 080212: Swift detection of a burst

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