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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"

35278 results found.

  1. LIGO/Virgo G275697: Swift/BAT data search
  2. GRB 170222A: CALET Gamma-Ray Burst Monitor detection
  3. LIGO/Virgo G275404: Swift/BAT data search
  4. LIGO/Virgo G274296: Swift/BAT data search
  5. GRB 170220A: POLAR Observation
  6. Konus-Wind observation of GRB 170222A
  7. GRB 170222A: Swift-XRT observations
  8. GRB 170222A: Fermi GBM observation
  9. LIGO/Virgo G274296: HAWC follow-up
  10. GRB 170222A: Tiled Swift observations
  11. GRB 170222A: Swift ToO observations
  12. IPN Triangulation of GRB 170222A (short/hard)
  13. GRB 170219A: POLAR Observation
  14. Swift Trigger 739517 is probably not a GRB
  15. GRB 170219A: CALET Gamma-Ray Burst Monitor detection
  16. GRB 170219A: Fermi GBM observation
  17. Konus-Wind observation of GRB 170219A (short/hard)
  18. IPN Triangulation of GRB 170219A (short/hard)
  19. GRB 170214A: Swift-XRT afterglow detection
  20. GRB 170214A: Mondy optical upper limit
  21. GRB 170214A: VLT/X-shooter spectroscopy and tentative redshift
  22. GRB170214A: RATIR Optical and NIR Afterglow Confirmation
  23. GRB 170214A: GROND detection in all bands
  24. GRB 170214A: NOT optical afterglow confirmation
  25. GRB 170214A: Swift/UVOT Upper Limits
  26. GRB170214A: RATIR Optical and NIR Observations
  27. GRB 170209A: GROND confirmation of MASTER afterglow
  28. GRB 170214A: Swift-XRT observations
  29. Konus-Wind observation of GRB 170214A
  30. GRB 170214A: Swift ToO observations
  31. GRB 170214A: Fermi-LAT detection
  32. GRB 170214A: Fermi GBM detection
  33. GRB 170208B: SMARTS optical/IR observations
  34. GRB 170208B: IRSF upper limits
  35. GRB 170208A: IRSF upper limits
  36. GRB 170208A: AstroSat CZTI detection
  37. GRB 170209A: AstroSat CZTI detection
  38. Konus-Wind observation of GRB 170210A
  39. GRB 170203A: 15 GHz upper limits from AMI
  40. GRB 170202A: 15 GHz upper limits from AMI
  41. GRB 170210A: POLAR observation
  42. GRB 170208C: POLAR Observation
  43. IBAS Trigger 7691 is not a GRB
  44. GRB 170209A: Swift-XRT observations
  45. IPN Triangulation of GRB 170210A
  46. GRB 170210A: Fermi GBM observation
  47. Konus-Wind observation of GRB 170209A
  48. GRB 170209A: Swift ToO observations
  49. GRB 170208B: Swift/UVOT Upper Limits
  50. IPN Triangulation of GRB 170209A
  51. GRB 170208B: RATIR Optical and NIR Observations
  52. GRB 170208B: Swift-BAT refined analysis
  53. GRB 170208A: Swift-BAT refined analysis
  54. GRB 170209A: Fermi GBM Detection
  55. Correction to GCN 20640: GRB 170208B: GROND observations
  56. GRB 170208A: Swift-XRT refined Analysis
  57. GRB 170208B WHT nIR candidate afterglow
  58. GRB 170208B: Fermi GBM Detection
  59. GRB 170207A: POLAR Observation
  60. GRB 170208A: Swift/UVOT Upper Limits
  61. Konus-Wind observation of GRB 170208B
  62. GRB 170207A: AstroSat CZTI detection
  63. Konus-Wind observation of GRB 170208A
  64. GRB 170208B: GROND observations
  65. GRB 170206C: POLAR Observation
  66. GRB 170208B: NOT upper limits
  67. GRB 170208B: Swift-XRT refined Analysis
  68. GRB 170208B: Etelman observatory optical observations
  69. GRB 170208B: Enhanced Swift-XRT position
  70. GRB 170208A: Enhanced Swift-XRT position
  71. GRB 170208A: Fermi GBM Detection
  72. GRB 170208B: Swift detection of a burst
  73. GRB 170208A: Swift detection of a burst
  74. GRB 170207A: Fermi GBM observation
  75. Konus-Wind observation of GRB 170207A
  76. IPN Triangulation of GRB 170207A (long/very bright)
  77. GRB 170206B: Swift/UVOT Upper Limits
  78. Konus-Wind observation of GRB 170206A
  79. GRB 170206A: POLAR observation
  80. IPN Triangulation of GRB 170206A (short/hard)
  81. GRB 170206B: Swift-BAT refined analysis
  82. GRB 170206B: Swift-XRT refined Analysis
  83. GRB 170206B: Enhanced Swift-XRT position
  84. GRB 170206B: Swift detection of a burst
  85. GRB 170206A: Fermi-LAT detection
  86. GRB 170206A: Fermi GBM observation
  87. GRB 170205A: Swift/UVOT Detection of a Fading Afterglow
  88. Konus-Wind observation of GRB 170205A
  89. GRB 170205A: Swift-BAT refined analysis
  90. GRB 170205A: NOT afterglow observations
  91. GRB 170205A: Swift-XRT refined Analysis
  92. GRB 170205A: Enhanced Swift-XRT position
  93. GRB 170205A: RATIR Optical and NIR Observations
  94. Fermi GBM trigger 508010837/170205755 is not a GRB
  95. Fermi GBM trigger 507959893/170205165 is not a GRB
  96. GRB 170202A: SMARTS optical/IR afterglow observations
  97. GRB 170205A: LCO FTN observations
  98. Konus-Wind observation of GRB 170202A
  99. GRB 170205A: Swift detection of a burst with an optical counterpart
  100. GRB 170202B POLAR Observation

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