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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"

37708 results found.

  1. GRB 170228B CALET Gamma-Ray Burst Monitor detection
  2. LIGO/Virgo G275697: Fermi GBM Upper Limits
  3. LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
  4. GRB 170228B: POLAR Observation
  5. LIGO/Virgo G275404: Fermi GBM Upper Limits
  6. GRB 170228A: AstroSat CZTI detection
  7. GRB 170206B: 15 GHz upper limits from AMI
  8. GRB 170228A: Fermi GBM observation
  9. GRB 170228A: Fermi-LAT detection
  10. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  11. LIGO/Virgo G275697: Konus-Wind observations
  12. LIGO/Virgo G275697: Swift/BAT data search
  13. LIGO/VIRGO G275697: Fermi GBM Observations
  14. LIGO/Virgo G275404: Fermi-LAT search for a high-energy gamma-ray counterpart
  15. GRB 170222A: CALET Gamma-Ray Burst Monitor detection
  16. LIGO/Virgo G275404: Swift/BAT data search
  17. LIGO/Virgo G274296: Swift/BAT data search
  18. LIGO/Virgo G275404: Fermi GBM Observations
  19. GRB 170220A: POLAR Observation
  20. Konus-Wind observation of GRB 170222A
  21. GRB 170222A: Swift-XRT observations
  22. GRB 170222A: Fermi GBM observation
  23. LIGO/Virgo G274296: HAWC follow-up
  24. GRB 170222A: Tiled Swift observations
  25. GRB 170222A: Swift ToO observations
  26. IPN Triangulation of GRB 170222A (short/hard)
  27. GRB 170219A: POLAR Observation
  28. Swift Trigger 739517 is probably not a GRB
  29. GRB 170219A: CALET Gamma-Ray Burst Monitor detection
  30. LIGO/Virgo G274296: Fermi-LAT search for a high-energy gamma-ray counterpart
  31. GRB 170219A: Fermi GBM observation
  32. Konus-Wind observation of GRB 170219A (short/hard)
  33. IPN Triangulation of GRB 170219A (short/hard)
  34. LIGO/VIRGO G274296: Fermi GBM Observations
  35. GRB 170214A: Swift-XRT afterglow detection
  36. GRB 170214A: Mondy optical upper limit
  37. GRB 170214A: VLT/X-shooter spectroscopy and tentative redshift
  38. GRB170214A: RATIR Optical and NIR Afterglow Confirmation
  39. GRB 170214A: GROND detection in all bands
  40. GRB 170214A: NOT optical afterglow confirmation
  41. GRB 170214A: Swift/UVOT Upper Limits
  42. GRB170214A: RATIR Optical and NIR Observations
  43. GRB 170209A: GROND confirmation of MASTER afterglow
  44. GRB 170214A: Swift-XRT observations
  45. Konus-Wind observation of GRB 170214A
  46. GRB 170214A: Swift ToO observations
  47. GRB 170214A: Fermi-LAT detection
  48. GRB 170214A: Fermi GBM detection
  49. GRB 170208B: SMARTS optical/IR observations
  50. GRB 170208B: IRSF upper limits
  51. GRB 170208A: IRSF upper limits
  52. GRB 170208A: AstroSat CZTI detection
  53. GRB 170209A: AstroSat CZTI detection
  54. Konus-Wind observation of GRB 170210A
  55. GRB 170203A: 15 GHz upper limits from AMI
  56. GRB 170202A: 15 GHz upper limits from AMI
  57. GRB 170210A: POLAR observation
  58. GRB 170208C: POLAR Observation
  59. IBAS Trigger 7691 is not a GRB
  60. GRB 170209A: Swift-XRT observations
  61. IPN Triangulation of GRB 170210A
  62. GRB 170210A: Fermi GBM observation
  63. Konus-Wind observation of GRB 170209A
  64. GRB 170209A: Swift ToO observations
  65. GRB 170208B: Swift/UVOT Upper Limits
  66. IPN Triangulation of GRB 170209A
  67. GRB 170208B: RATIR Optical and NIR Observations
  68. GRB 170208B: Swift-BAT refined analysis
  69. GRB 170208A: Swift-BAT refined analysis
  70. GRB 170209A: Fermi GBM Detection
  71. Correction to GCN 20640: GRB 170208B: GROND observations
  72. Fermi Trigger 508295323: MASTER-OAFA possible OT detection
  73. GRB 170208A: Swift-XRT refined Analysis
  74. GRB 170208B WHT nIR candidate afterglow
  75. GRB 170208B: Fermi GBM Detection
  76. GRB 170207A: POLAR Observation
  77. GRB 170208A: Swift/UVOT Upper Limits
  78. Konus-Wind observation of GRB 170208B
  79. GRB 170207A: AstroSat CZTI detection
  80. Konus-Wind observation of GRB 170208A
  81. GRB 170208B: GROND observations
  82. GRB 170206C: POLAR Observation
  83. GRB 170208B: NOT upper limits
  84. GRB 170208B: Swift-XRT refined Analysis
  85. GRB 170208B: Etelman observatory optical observations
  86. GRB 170208B: Enhanced Swift-XRT position
  87. GRB 170208A: Enhanced Swift-XRT position
  88. GRB 170208A: Fermi GBM Detection
  89. GRB 170208B: Swift detection of a burst
  90. GRB 170208A: Swift detection of a burst
  91. GRB 170207A: Fermi GBM observation
  92. Konus-Wind observation of GRB 170207A
  93. IPN Triangulation of GRB 170207A (long/very bright)
  94. GRB 170206B: Swift/UVOT Upper Limits
  95. Konus-Wind observation of GRB 170206A
  96. GRB 170206A: POLAR observation
  97. IPN Triangulation of GRB 170206A (short/hard)
  98. GRB 170206B: Swift-BAT refined analysis
  99. GRB 170206B: Swift-XRT refined Analysis
  100. GRB 170206B: Enhanced Swift-XRT position

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