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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.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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"

19607 results found.

  1. GRB 170307A (trigger 741528): Swift-BAT refined analysis
  2. GRB 170305A: POLAR observation
  3. Swift trigger 741567: MASTER red star flare detection
  4. GRB 170307A: Fermi GBM observation
  5. Swift Trigger 741528: a possible GRB
  6. GRB 170306B: Swift-XRT observations
  7. GRB 170306A, Swift-BAT refined analysis
  8. GRB 170306A: Swift-XRT refined Analysis
  9. GRB 170306B: Fermi-LAT detection
  10. GRB 170306B: Tiled Swift observations
  11. IPN Triangulation of GRB 170305A (short)
  12. GRB 170306A: Swift/UVOT Upper Limits
  13. GRB 170306A: GROND observations
  14. LIGO/Virgo G275697: Further Swift-XRT sources
  15. GRB 170306A: LCO Cerro Tololo observations
  16. GRB 170306A: Swift detection of a burst
  17. LIGO/Virgo G275697: Further Swift-XRT sources
  18. LIGO/Virgo G275697: Further Swift-XRT sources
  19. LIGO/Virgo G275697: Further Swift-XRT sources
  20. LIGO/Virgo G275697: optical spectroscopy of Swift/XRT source 1
  21. GRB 170206B: 15 GHz upper limits from AMI
  22. GRB 170228A: Fermi-LAT detection
  23. LIGO/Virgo G275697: Swift-XRT sources
  24. LIGO/Virgo G275697: Swift/BAT data search
  25. LIGO/Virgo G275404: Swift-XRT sources
  26. LIGO/Virgo G275404: Swift/BAT data search
  27. LIGO/Virgo G274296: Swift/BAT data search
  28. GRB 170222A: Swift-XRT observations
  29. GRB 170222A: Tiled Swift observations
  30. GRB 170222A: Swift ToO observations
  31. IPN Triangulation of GRB 170222A (short/hard)
  32. Swift Trigger 739517 is probably not a GRB
  33. GRB 170214A: Swift-XRT afterglow detection
  34. Trigger 738728: Swift triggered on noise near NGC 4096
  35. GRB 170214A: GROND detection in all bands
  36. GRB 170214A: Swift/UVOT Upper Limits
  37. GRB170214A: RATIR Optical and NIR Observations
  38. GRB 170214A: Swift-XRT observations
  39. GRB 170214A: Swift ToO observations
  40. GRB 170214A: Fermi-LAT detection
  41. GRB 170208A: AstroSat CZTI detection
  42. GRB 170203A: 15 GHz upper limits from AMI
  43. GRB 170202A: 15 GHz upper limits from AMI
  44. GRB 170209A: Swift-XRT observations
  45. IPN Triangulation of GRB 170210A
  46. GRB 170209A: Swift ToO observations
  47. GRB 170208B: Swift/UVOT Upper Limits
  48. GRB 170208B: Swift-BAT refined analysis
  49. GRB 170208A: Swift-BAT refined analysis
  50. GRB 170208A: Swift-XRT refined Analysis
  51. GRB 170208B WHT nIR candidate afterglow
  52. GRB 170208B: Fermi GBM Detection
  53. GRB 170208A: Swift/UVOT Upper Limits
  54. Konus-Wind observation of GRB 170208B
  55. Konus-Wind observation of GRB 170208A
  56. GRB 170208B: GROND observations
  57. GRB 170208B: Swift-XRT refined Analysis
  58. GRB 170208B: Enhanced Swift-XRT position
  59. GRB 170208A: Enhanced Swift-XRT position
  60. GRB 170208A: Fermi GBM Detection
  61. GRB 170208B: Swift detection of a burst
  62. GRB 170208A: Swift detection of a burst
  63. IPN Triangulation of GRB 170207A (long/very bright)
  64. GRB 170206B: Swift/UVOT Upper Limits
  65. GRB 170206B: Swift-BAT refined analysis
  66. GRB 170206B: Swift-XRT refined Analysis
  67. GRB 170206B: Enhanced Swift-XRT position
  68. GRB 170206B: Swift detection of a burst
  69. GRB 170205A: Swift/UVOT Detection of a Fading Afterglow
  70. Konus-Wind observation of GRB 170205A
  71. GRB 170205A: Swift-BAT refined analysis
  72. GRB 170205A: Swift-XRT refined Analysis
  73. GRB 170205A: Enhanced Swift-XRT position
  74. GRB 170205A: LCO FTN observations
  75. Konus-Wind observation of GRB 170202A
  76. GRB 170205A: Swift detection of a burst with an optical counterpart
  77. GRB 170131A: POLAR Observation
  78. GRB 170203A: Swift-BAT refined analysis
  79. GRB 170202A: Swift-BAT refined analysis
  80. GRB 170202A: RATIR Optical and NIR Observations
  81. GRB 170202A: LCO FTN observations
  82. GRB 170202A: Swift-XRT refined Analysis
  83. GRB 170202A: T100 observations
  84. GRB 170202A: Swift/UVOT Detection
  85. GRB 170202A: Enhanced Swift-XRT position
  86. GRB 170203A: Swift detection of a burst
  87. GRB 170202A: Zadko observatory - Gingin optical observations
  88. GRB 170202A: LCO Sutherland observations
  89. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  90. GRB 170202A: Swift detection of a burst with an optical afterglow
  91. GRB 170131A: Swift/UVOT Upper Limits
  92. GRB 170131A: Swift-XRT observations
  93. GRB 170131A: Fermi GBM observation
  94. GRB 170131A: Swift ToO observations
  95. GRB 170131A detected in Swift/BAT ground processing
  96. GRB 170127B: Swift-BAT refined analysis
  97. GRB 170127A: Swift-BAT refined analysis
  98. GRB 170127C: Swift-XRT observations
  99. GRB 170127A: GROND Upper limits
  100. GRB 170127B: Swift-XRT refined Analysis

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