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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"

27415 results found.

  1. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  2. GRB 131030A: Swift detection of a burst with an optical counterpart
  3. GRB 131029A: Fermi GBM observation
  4. GRB 131029A: Fermi-LAT detection of a burst
  5. IPN Triangulation of GRB 131028A (long/bright)
  6. GRB 131028A: Fermi GBM detection
  7. Swift 575905/GRB 131026A: optical observations
  8. Swift-BAT Trigger 575905 is probably not a real source
  9. GRB 131024B: Mondy optical upper limits
  10. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  11. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  12. Swift Trigger 575905: ROTSE-III Optical Limits
  13. Swift Trigger 575905: KAIT Optical Upper Limit
  14. GRB 131026A: TAROT La Silla observatory optical observations
  15. Swift Trigger 575905: a possible GRB
  16. GRB 131024B, Swift-BAT refined analysis
  17. GRB 131024B: Fermi GBM observation
  18. GRB 131024B: RATIR Optical and NIR Observations
  19. GRB 131024B: Swift/UVOT Upper Limits
  20. GRB 131024B: Swift-XRT refined Analysis
  21. Fermi GBM trigger 13121024.436 is not a GRB
  22. GRB 131024B: Nanshan optical upper limit
  23. GRB 131024A: Swift/UVOT Upper Limits
  24. GRB 131024A: Swift-XRT refined Analysis
  25. GRB 131024B: Swift detection of a burst
  26. GRB 131024A, Swift-BAT refined analysis
  27. GRB 131024A: Skynet R-COP optical observations
  28. Konus-Wind observation of GRB 131011B
  29. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  30. GRB 131024A: Swift detection of a burst
  31. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  32. IPN Triangulation of GRB 131014A
  33. GRB 131018B: Swift/UVOT Upper Limits
  34. GRB 131018B: Swift-XRT observations
  35. GRB 131018B: Fermi GBM observation
  36. GRB 131018A: RATIR Optical and NIR Observations
  37. GRB 131018A: Swift/UVOT Upper Limits
  38. GRB 131018B: Fermi-LAT detection of a burst
  39. GRB 131018A: Swift-XRT refined Analysis
  40. GRB 131018A, Swift-BAT refined analysis
  41. GRB131018A, optical observations
  42. GRB 131018A: Swift detection of a burst
  43. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  44. Fermi GBM data availability during U.S. government shutdown
  45. GRB 131014A: Swift-XRT refined Analysis
  46. GRB 131011A: Swift/UVOT Upper Limits
  47. Fermi 403206457 / GRB 131011A: AAO optical observations
  48. GRB 131014A: RATIR Optical and NIR Observations
  49. GRB 131014A: NOT afterglow candidate
  50. GRB 131014A: Nanshan optical observations
  51. GRB 131014A: Fermi-LAT detection
  52. GRB 131014A: Fermi GBM detection
  53. GRB 131011A: Fermi GBM detection
  54. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  55. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  56. Fermi403206457: continued P60 observations and fading behavior
  57. Fermi403206457: Weihai optical upper limit
  58. Fermi403206457: NOT optical observations
  59. Fermi403206457: iPTF detection of a possible optical afterglow
  60. Trigger 574266 is not a Swift detection of a known source
  61. GRB 130831A: Continued RATIR Optical and NIR Observations
  62. GRB 131004A: MOSFIRE NIR imaging
  63. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  64. GRB 131004A, Swift-BAT refined analysis
  65. GRB 131004A: Fermi GBM observation
  66. GRB 131004A: Swift/UVOT Detection
  67. GRB 131004A: RATIR Optical and NIR Upper Limits
  68. GRB 131004A: Swift-XRT refined Analysis
  69. GRB 131004A: GROND observations of the afterglow
  70. GRB 131004A: Liverpool Telescope optical afterglow observations
  71. GRB 131004A: Swift detection of a burst (may be short)
  72. GRB 131002A, Swift-BAT refined analysis
  73. GRB 131002A: Fermi GBM observation
  74. GRB 131002B, Swift-BAT refined analysis
  75. GRB 131002B: GROND upper limits
  76. GRB 131002B: Swift-XRT Refined Analysis
  77. GRB 131002B: Swift/UVOT Upper Limits
  78. GRB 131002A: Swift/UVOT Detection
  79. GRB 131001A, Swift-BAT refined analysis
  80. GRB 131002A: Swift-XRT refined Analysis
  81. GRB 131002A: ISON-NM optical observations
  82. Swift J1242.9-3530, Swift-BAT refined analysis
  83. GRB 131001A: Swift UVOT and XRT Upper Limits
  84. NuSTAR observations of GRB 130925A
  85. Fermi Gamma-ray Burst Monitor trigger 402405063 / 131002466 is not a GRB
  86. GRB 131002B: Swift detection of a burst
  87. GRB 131002A: Swift detection of a burst
  88. GRB 131002A: Faulkes Telescope North optical afterglow
  89. GRB 131001A detected in ground analysis of Swift-BAT data
  90. GRB 130925A: continuing Swift/XRT monitoring
  91. IPN Observations of GRB 130925A
  92. GRB 130930A: Swift detection of a burst
  93. GRB 130929A: Swift/UVOT Upper Limits
  94. GRB 130831A: Continued RATIR Optical and NIR Observations
  95. GRB 130929A: Swift-XRT refined Analysis
  96. GRB 130929A, Swift-BAT refined analysis
  97. GRB 130929A: TAROT La Silla observatory optical observations
  98. GRB 130929A: Swift detection of a burst
  99. Fermi LAT Upper Limits on GRB 130925A
  100. GRB 130925A: Swift/UVOT Detection of the Host Galaxy

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