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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"

19666 results found.

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

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