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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.

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

19662 results found.

  1. GRB 170317A: 15 GHz upper limits from AMI
  2. GRB 170330A: LCO Cerro Tololo observations
  3. GRB 170331A: LCO Sutherland observations
  4. GRB 170331A: Prompt enhanced Swift-XRT position
  5. GRB 170331A: Swift detection of a burst
  6. GRB 170330A: Prompt enhanced Swift-XRT position
  7. GRB 170330A: Swift detection of a burst
  8. GRB 170325A: Fermi GBM observation
  9. GRB 170325A, Swift-BAT detection of a short GRB
  10. LIGO/Virgo G275697: AMI Large Array Search for a Radio Afterglow
  11. IPN Triangulation of GRB 170320A (long/intense)
  12. GRB 170318A: KAIT Optical Upper Limit
  13. GRB 170318B: Swift-BAT refined analysis
  14. GRB 170317A: POLAR observation
  15. GRB 170318B: RATIR Optical and NIR Observations
  16. GRB 170317A: RATIR Optical and NIR Observations
  17. GRB 170318B: Swift/UVOT Upper Limits
  18. GRB 170318B: Swift-XRT refined Analysis
  19. GRB 170318A: Swift-XRT refined Analysis
  20. GRB 170318A: RATIR Optical and NIR Observations
  21. GRB 170318A: Swift/UVOT Upper Limits
  22. GRB 170318B: Fermi GBM observation
  23. GRB 170318A: Swift-BAT refined analysis
  24. GRB 170317A: RATIR Optical and NIR Observations
  25. GRB 170318B: Enhanced Swift-XRT position
  26. GRB 170318B: Prompt enhanced Swift-XRT position
  27. GRB 170318B: Swift detection of a burst
  28. GRB 170318A: Enhanced Swift-XRT position
  29. GRB 170318A: Prompt enhanced Swift-XRT position
  30. GRB 170318A: Swift detection of a burst
  31. IceCube-170312A: MASTER follow-up observations
  32. GRB 170317A: LCO FTN observations
  33. GRB 170317A: Swift-BAT refined analysis
  34. GRB 170317A: Swift/UVOT Detection
  35. GRB 170317A: Swift-XRT refined Analysis
  36. IceCube-170312A: Swift-XRT observations
  37. GRB 170317A : Xinglong TNT optical observation
  38. GRB 170317A: Enhanced Swift-XRT position
  39. GRB 170317A: Swift detection of a burst with an optical counterpart
  40. LIGO/Virgo G275697: Swift-XRT source 23 no longer fading
  41. LIGO/Virgo G277583: Swift/BAT data search
  42. GRB 170307A: 15 GHz upper limit from AMI
  43. IPN Triangulation of GRB 170311B (long/very intense)
  44. GRB 170311A: Swift-BAT refined analysis
  45. LIGO/Virgo G275697: GRAWITA NOT optical observations of Swift/XRT Source 23
  46. GRB 170311A: Further GROND analysis
  47. GRB 170311A: Swift-XRT refined Analysis
  48. GRB 170311A: Swift/UVOT Upper Limits
  49. GRB 170311A: Enhanced Swift-XRT position
  50. GRB 170311A: GROND upper limits
  51. GRB 170311A: MASTER-OAFA early optical observations
  52. GRB 170311A: Swift detection of a burst
  53. GRB170306A: SALT observations
  54. GRB 170306A: GROND afterglow detection
  55. LIGO/Virgo G275404: Swift-XRT observations of sources in the AGILE error region
  56. LIGO/Virgo G275697: Swift-XRT source 23 is fading
  57. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  58. GRB 170305A: POLAR observation
  59. Swift trigger 741567: MASTER red star flare detection
  60. GRB 170307A: Fermi GBM observation
  61. Swift Trigger 741528: a possible GRB
  62. GRB 170306B: Swift-XRT observations
  63. GRB 170306A, Swift-BAT refined analysis
  64. GRB 170306A: Swift-XRT refined Analysis
  65. GRB 170306B: Fermi-LAT detection
  66. GRB 170306B: Tiled Swift observations
  67. IPN Triangulation of GRB 170305A (short)
  68. GRB 170306A: Swift/UVOT Upper Limits
  69. GRB 170306A: GROND observations
  70. LIGO/Virgo G275697: Further Swift-XRT sources
  71. GRB 170306A: LCO Cerro Tololo observations
  72. GRB 170306A: Swift detection of a burst
  73. LIGO/Virgo G275697: Further Swift-XRT sources
  74. LIGO/Virgo G275697: Further Swift-XRT sources
  75. LIGO/Virgo G275697: Further Swift-XRT sources
  76. LIGO/Virgo G275697: optical spectroscopy of Swift/XRT source 1
  77. GRB 170206B: 15 GHz upper limits from AMI
  78. GRB 170228A: Fermi-LAT detection
  79. LIGO/Virgo G275697: Swift-XRT sources
  80. LIGO/Virgo G275697: Swift/BAT data search
  81. LIGO/Virgo G275404: Swift-XRT sources
  82. LIGO/Virgo G275404: Swift/BAT data search
  83. LIGO/Virgo G274296: Swift/BAT data search
  84. GRB 170222A: Swift-XRT observations
  85. GRB 170222A: Tiled Swift observations
  86. GRB 170222A: Swift ToO observations
  87. IPN Triangulation of GRB 170222A (short/hard)
  88. Swift Trigger 739517 is probably not a GRB
  89. GRB 170214A: Swift-XRT afterglow detection
  90. Trigger 738728: Swift triggered on noise near NGC 4096
  91. GRB 170214A: GROND detection in all bands
  92. GRB 170214A: Swift/UVOT Upper Limits
  93. GRB170214A: RATIR Optical and NIR Observations
  94. GRB 170214A: Swift-XRT observations
  95. GRB 170214A: Swift ToO observations
  96. GRB 170214A: Fermi-LAT detection
  97. GRB 170208A: AstroSat CZTI detection
  98. GRB 170203A: 15 GHz upper limits from AMI
  99. GRB 170202A: 15 GHz upper limits from AMI
  100. GRB 170209A: Swift-XRT observations

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