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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').
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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"

32495 results found.

  1. GRB071008: optical observations
  2. GRB 071010B possible optical transient
  3. GRB 071010A: Keck/LRIS Photometry
  4. GRB 071010: Swift-XRT observation
  5. GRB 071008, Swift-BAT refined analysis
  6. GRB 071010, Swift-BAT refined analysis
  7. Konus-Wind observation of GRB 071006
  8. GRB071008: Swift-XRT observation
  9. GRB 071010 REM NIR observations
  10. GRB 071010: Keck/LRIS Spectroscopy
  11. GRB 071010: Rapid PROMPT Detections
  12. GRB 071010: Keck Observations of the Afterglow
  13. GRB071008: IAC80 observation
  14. GRB 071003: XRT refined analysis
  15. GRB070920A: MAGIC telescope GeV observation
  16. Radio detection of GRB 071003 with the VLA
  17. GRB 070810B: further XRT analysis
  18. GRB 071003: VLT spectroscopy
  19. GRB 071003: Keck spectroscopy
  20. Konus-Wind observation of GRB 071003
  21. GRB071003: Faulkes Telescope North observations
  22. GRB 071003: Possible rebrightening
  23. GRB 071003 : Lulin R-band observations
  24. GRB 071003: Swift XRT position
  25. GRB 071003: OA power-law decay indices from KAIT
  26. GRB 071003: Keck HIRES spectroscopy
  27. GRB 071003, Swift-BAT refined analysis
  28. GRB 071003: MARGE Observations
  29. GRB 071003 Optical observations
  30. GRB 071003: P60 Confirmation of Optical Afterglow
  31. GRB 071003: KAIT optical afterglow observations
  32. GRB 070714B: host galaxy spectroscopic redshift
  33. GRB 071001: Swift-XRT Team refined analysis
  34. GRB 071001, Swift-BAT refined analysis
  35. Faulkes Telescope South observations of GRB 071001
  36. VLA observation of GRB 070923
  37. Disregard the Swift-XRT Notices today
  38. GRB 070911, SMARTS optical/IR afterglow observations
  39. GRB070925: Swift-XRT Afterglow confirmation
  40. GRB 070925: Gemini South Imaging
  41. GRB070925: Swift-XRT Position
  42. Update on Swift Status
  43. GRB 070920B: ROTSE-III Early Optical Limits
  44. Recent SGR1806-20 Activity
  45. GRB 070923, Swift-BAT refined analysis
  46. GRB 070920B: XRT observations
  47. GRB 070923: Galaxies within BAT localization
  48. GRB 070917: Suzaku/WAM observation of the prompt emission
  49. INTEGRAL ToO observations of SGR1806-20
  50. GRB 070920b, SMARTS optical observation
  51. GRB 070917: Confirmation of the X-ray afterglow
  52. GRB 070920b: LCO optical observations
  53. GRB 070920B, Swift-BAT refined analysis
  54. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  55. GRB 070920, Swift-BAT refined analysis
  56. SGR1806-20: Swift-BAT detection of enhanced activity
  57. GRB070917: Confirmation of optical afterglow
  58. GRB920925C: search for host galaxy
  59. GRB070917: optical observations
  60. GRB 070917: P60 Observations
  61. Konus-Wind observation of GRB 070917
  62. Swift Status and XRT Calibration Uncertainties
  63. GRB 070917: Swift-XRT observations
  64. GRB 070917: KAIT optical limits
  65. GRB 070917: MITSuME Akeno Ic upper limit
  66. GRB 070917: R band observations
  67. GRB 070917, Swift-BAT refined analysis
  68. GRB 070911: Suzaku WAM observation of the prompt emission
  69. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  70. GRB 070809: The Swift evidence for the SHB nature of this burst
  71. GRB 070913: Swift-BAT refined analysis
  72. GRB 070913: Corrected BAT position
  73. GRB 070913: SMARTS optical/IR observations
  74. GRB 070911: PAIRITEL IR Observations
  75. GRB 070911: Swift XRT refined analysis
  76. GRB 070911, Swift-BAT refined analysis
  77. IPN search for a GRB associated with TAROT transient on August 31
  78. Intense burst from SGR 1806-20 detected on September 7
  79. GRB 070809: Confirmation of optical transient
  80. Observations of possible TAROT GRB transient near IC 4779
  81. GRB 070810b: Image Subtraction of Multiple Keck Observations
  82. Las Campanas observations of possible TAROT GRB transient near IC
  83. Konus-Wind observation of GRB 070824
  84. Konus-Wind observation of very bright GRB 070821
  85. GRB 070731: Swift/UVOT Upper Limit
  86. GRB 070805: UVOT afterglow candidate retraction
  87. GRB070810b: optical candidate
  88. GRB 070810A: ROTSE-III Refined Analysis
  89. GRB 061110A: redshift confirmed
  90. GRB 070810B : Faulkes Telescope South Observations
  91. GRB 070810A: Continued Keck Imaging
  92. GRB 070810B: Keck spectroscopy of possible host galaxies
  93. GRB070810B: Swift/UVOT Upper Limits
  94. GRB 070810B: XRT refined analysis
  95. GRB 070810B, Swift-BAT refined analysis
  96. GRB 070809: Swift/UVOT Corrected Photometry
  97. Swift Trigger 287421: False trigger due to star tracker loss
  98. GRB 070810A: Swift-BAT refined analysis
  99. GRB 070810B: Xinglong TNT optical Upper Limit
  100. GRB070810B: Optical observations with KANATA

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