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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"

19662 results found.

  1. GRB 131030A: Continued RATIR Optical and NIR Observations
  2. GRB 131031A: Swift-XRT afterglow confirmation
  3. GRB 131029A: Suzaku WAM observation of the prompt emission
  4. GRB 131105A, Swift-BAT refined analysis
  5. GRB 131105A: Swift-XRT refined Analysis
  6. GRB 131103A: Swift-BAT refined analysis
  7. GRB 131030A: Swift-BAT refined analysis
  8. GRB 131105A: Fermi GBM observation
  9. GRB 131105A: Swift/UVOT Upper Limits
  10. GRB 131024B: Suzaku WAM observation of the prompt emission
  11. Konus-Wind observation of GRB 131105A
  12. GRB 131105A: TAROT La Silla observatory optical observations
  13. GRB 131105A: Enhanced Swift-XRT position
  14. GRB 131105A: Swift detection of a burst
  15. GRB 131030A: Continued RATIR Optical and NIR Observations
  16. GRB 131103A: Swift/UVOT Detection
  17. GRB 131103A: Enhanced Swift-XRT position
  18. GRB 131103A: Swift-XRT refined Analysis
  19. GRB 131103A: Swift detection of a burst
  20. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  21. GRB 131018B: RATIR Optical/NIR Observations
  22. GRB 131031A: Fermi GBM detection
  23. GRB 131031A: Swift/UVOT Upper Limits
  24. GRB 131018B: Further Swift-XRT observations.
  25. GRB 131030A - RoboPol optical afterglow polarimetry
  26. GRB 131030A: Bassano Bresciano Observatory optical observations
  27. GRB 131031A: Swift-XRT observations
  28. GRB 131030A: P60 observations
  29. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  30. GRB 131031A found in ground analysis of BAT data
  31. GRB 131030A: TAROT La Silla observatory optical observations
  32. GRB 131030A: Swift-XRT refined Analysis
  33. GRB 131030A: Enhanced Swift-XRT position
  34. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  35. GRB 131030A: Swift/UVOT Detection
  36. Konus-Wind observation of GRB 131030A
  37. GRB 131030A: SAO RAS optical observations
  38. GRB 131030A: D50+BART detection and light curve optical decay
  39. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  40. GRB 131030A: MASTER optical observation
  41. GRB 131029A: Swift-XRT follow up
  42. GRB 131030A: Swift detection of a burst with an optical counterpart
  43. GRB 131029A Tiled Swift observations
  44. GRB 131029A: Fermi-LAT detection of a burst
  45. IPN Triangulation of GRB 131028A (long/bright)
  46. Swift 575905/GRB 131026A: optical observations
  47. Swift-BAT Trigger 575905 is probably not a real source
  48. GRB 131024B: AAO optical upper limit
  49. GRB 131024B: Mondy optical upper limits
  50. GRB 131024B: MASTER prompt optical observation
  51. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  52. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  53. Swift Trigger 575905: ROTSE-III Optical Limits
  54. Swift Trigger 575905: KAIT Optical Upper Limit
  55. GRB 131026A: TAROT La Silla observatory optical observations
  56. Swift Trigger 575905: a possible GRB
  57. GRB 131024B, Swift-BAT refined analysis
  58. GRB 131024B: Fermi GBM observation
  59. GRB 131024B: RATIR Optical and NIR Observations
  60. GRB 131024B: Swift/UVOT Upper Limits
  61. GRB 131024B: Swift-XRT refined Analysis
  62. GRB 131024A: Swift/UVOT Upper Limits
  63. GRB 131024B: Enhanced Swift-XRT position
  64. GRB 131024A: Swift-XRT refined Analysis
  65. GRB 131024B: Swift detection of a burst
  66. GRB 131024A, Swift-BAT refined analysis
  67. GRB 131024A: Skynet R-COP optical observations
  68. Konus-Wind observation of GRB 131011B
  69. GRB 131024A: Enhanced Swift-XRT position
  70. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  71. GRB 131024A: Swift detection of a burst
  72. IPN Triangulation of GRB 131014A
  73. GRB 131018B: Swift/UVOT Upper Limits
  74. GRB 131018B: Swift-XRT observations
  75. GRB 131018A: RATIR Optical and NIR Observations
  76. GRB 131018A: Swift/UVOT Upper Limits
  77. GRB 131018B: Fermi-LAT detection of a burst
  78. GRB 131018A: Swift-XRT refined Analysis
  79. GRB 131018A, Swift-BAT refined analysis
  80. GRB 131018A: P60 Observations
  81. GRB 131018A: Enhanced Swift-XRT position
  82. GRB 131014A: XRT position information
  83. GRB131018A, optical observations
  84. GRB 131018A: Swift detection of a burst
  85. GRB 131014A: Swift-XRT refined Analysis
  86. GRB 131011A: Swift/UVOT Upper Limits
  87. GRB 131014A: Swift/UVOT Upper Limits
  88. GRB 131014A: RATIR Optical and NIR Observations
  89. GRB 131014A: Enhanced XRT position
  90. GRB 131014A: Swift detection of a possible X-ray afterglow
  91. GRB 131014A Tiled Swift observations
  92. GRB 131014A: Fermi-LAT detection
  93. GRB 131011A: Fermi GBM detection
  94. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  95. Trigger 574266 is not a Swift detection of a known source
  96. GRB 130831A: Continued RATIR Optical and NIR Observations
  97. GRB 131004A: Correction to XRT refined analysis
  98. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  99. GRB 131004A, Swift-BAT refined analysis
  100. GRB 131004A: Fermi GBM observation

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