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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

27594 results found.

  1. GRB 071011: Kanazawa Optical limits
  2. GRB 071011: MARGE Optical Limits
  3. GRB 071010B: Super-LOTIS upper limit
  4. GRB 071011: XRT afterglow detection
  5. GRB 071011, Swift-BAT refined analysis
  6. GRB 071011: Early Super-LOTIS Observations
  7. GRB 071011: Optical afterglow candidate
  8. GRB 071011: Swift detection of a burst
  9. Konus-Wind observation of GRB 071010B
  10. GRB071010B: Swift/XRT detection
  11. GRB 071010B, Swift-BAT refined analysis
  12. GRB 071006, Swift-BAT refined analysis
  13. GRB071008: optical observations
  14. GRB 071010B possible optical transient
  15. GRB 071010A: Keck/LRIS Photometry
  16. GRB 071010B: Swift detection of a burst
  17. GRB 071010: Swift-XRT observation
  18. GRB 071008, Swift-BAT refined analysis
  19. GRB 071010, Swift-BAT refined analysis
  20. GRB071008: Swift-XRT observation
  21. GRB 071010: TAROT La Silla observatory photometry of the afterglow
  22. GRB 071010: TAROT La Silla observatory detection of the afterglow
  23. GRB 071010: Swift detection of a burst
  24. GRB 071006 Swift-BAT detection of a burst
  25. GRB071008: IAC80 observation
  26. GRB 071008: Swift detection of a burst
  27. GRB 071003: XRT refined analysis
  28. GRB070920A: MAGIC telescope GeV observation
  29. Radio detection of GRB 071003 with the VLA
  30. GRB 070810B: further XRT analysis
  31. GRB 071003: Keck spectroscopy
  32. Konus-Wind observation of GRB 071003
  33. GRB071003: Faulkes Telescope North observations
  34. GRB 071003: Swift XRT position
  35. GRB 071003, Swift-BAT refined analysis
  36. GRB 071003: MARGE Observations
  37. GRB 071003: KAIT optical afterglow observations
  38. GRB 071003: Swift detection of a bright burst
  39. GRB 070714B: host galaxy spectroscopic redshift
  40. GRB 071001: Swift-XRT Team refined analysis
  41. GRB 071001, Swift-BAT refined analysis
  42. Faulkes Telescope South observations of GRB 071001
  43. GRB 071001: Swift detection of a burst
  44. VLA observation of GRB 070923
  45. GRB070925: Swift-XRT Position
  46. Update on Swift Status
  47. GRB 070920B: ROTSE-III Early Optical Limits
  48. Recent SGR1806-20 Activity
  49. GRB 070923, Swift-BAT refined analysis
  50. GRB 070920B: XRT observations
  51. GRB 070923: Galaxies within BAT localization
  52. GRB 070923: Swift detection of a short hard burst
  53. GRB 070917: Suzaku/WAM observation of the prompt emission
  54. GRB 070920B: TAROT La Silla observatory optical observations
  55. GRB 070920b: LCO optical observations
  56. GRB 070920B, Swift-BAT refined analysis
  57. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  58. GRB 070920B: NOT optical observations
  59. GRB 070920B: Swift detection of a burst
  60. GRB 070920, Swift-BAT refined analysis
  61. GRB 070920: TAROT Calern observatory optical observations
  62. GRB 070920: Swift detection of a burst
  63. SGR1806-20: Swift-BAT detection of enhanced activity
  64. GRB 070917: P60 Observations
  65. GRB 070917: pseudo-z= 2.40 from prompt emission spectrum
  66. Konus-Wind observation of GRB 070917
  67. Swift Status and XRT Calibration Uncertainties
  68. GRB 070917: Swift-XRT observations
  69. GRB 070917: KAIT optical limits
  70. GRB 070917: MITSuME Akeno Ic upper limit
  71. GRB 070917, Swift-BAT refined analysis
  72. GRB 070917: Swift detection of a bright burst
  73. GRB 070911: Suzaku WAM observation of the prompt emission
  74. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  75. GRB 070809: The Swift evidence for the SHB nature of this burst
  76. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  77. GRB 070913: Swift-BAT refined analysis
  78. GRB 070913: Corrected BAT position
  79. GRB 070913: SMARTS optical/IR observations
  80. GRB 070913: TAROT La Silla observatory optical observations
  81. GRB 070913: Swift detection of a burst
  82. Swift-BAT Notices back to autonomous real-time distribution
  83. GRB 070911: Swift XRT refined analysis
  84. GRB 070911, Swift-BAT refined analysis
  85. GRB 070911: Swift detection of a burst
  86. IPN search for a GRB associated with TAROT transient on August 31
  87. Intense burst from SGR 1806-20 detected on September 7
  88. GRB 070810b: Image Subtraction of Multiple Keck Observations
  89. GRB 070824 - Combined SuperAGILE/IPN Localization
  90. GRB 070731: Swift/UVOT Upper Limit
  91. GRB 070805: UVOT afterglow candidate retraction
  92. GRB 070810A: ROTSE-III Refined Analysis
  93. Swift observatory off line
  94. GRB 070810B : Faulkes Telescope South Observations
  95. GRB 070810B: Keck spectroscopy of possible host galaxies
  96. GRB070810B: Swift/UVOT Upper Limits
  97. GRB 070810B: XRT refined analysis
  98. GRB 070810B, Swift-BAT refined analysis
  99. GRB 070809: Swift/UVOT Corrected Photometry
  100. Swift Trigger 287421: False trigger due to star tracker loss

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