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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. IPN Triangulation of GRB 190206A (short/extremely bright)
  2. GRB 190204A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 190202A: AstroSat CZTI detection
  4. GRB 190203A: Swift-BAT refined analysis
  5. GRB 190204A: Swift-BAT refined analysis
  6. Konus-Wind observation of GRB 190204A
  7. GRB 190203A: AstroSat CZTI detection
  8. GRB190203A: UVOT analysis
  9. GRB 190204A: Swift/UVOT Detection
  10. GRB 190204A: Enhanced Swift-XRT position
  11. Konus-Wind observation of GRB 190203A
  12. GRB 190203A: Swift-XRT refined Analysis
  13. GRB 190204A: Swift-XRT refined Analysis
  14. GRB 190204A: AstroSat CZTI detection
  15. Swift Trigger 887541: MASTER inspect
  16. GRB 190204A: MAXI/GSC detection
  17. GRB 190202A: R and I band observation from HCT
  18. GRB 190204A: Swift detection of a burst with a possible optical counterpart
  19. Swift Trigger 887541: MASTER optical observation
  20. GRB 190203A: MASTER OT detection
  21. Swift Trigger 887541: Swift detection of Swift J1728.9-3613
  22. GRB 190203A: Enhanced Swift-XRT position
  23. GRB 190203A: Swift detection of a burst with an optical counterpart
  24. GRB 190202A: Swift-XRT refined Analysis
  25. GRB 190202A: LCO-CTIO optical observations
  26. GRB 190202A: Fermi GBM observation
  27. GRB 190202A, Swift-BAT refined analysis
  28. GRB 190202A: AGILE ratemeters detection
  29. GRB 190202A: Swift/UVOT Detection
  30. GRB 190202A: GOTO optical observations
  31. GRB 190202A: Enhanced Swift-XRT position
  32. GRB 190202A: Swift detection of a burst with an optical counterpart
  33. Improved IPN error box for GRB 190129B
  34. GRB 190129B: Swift/UVOT Upper Limits
  35. GRB 190129B: AstroSat CZTI detection
  36. GRB 190129B: MASTER Global Robotic Net optical observation
  37. GRB 190129B: Swift-XRT candidate afterglow detection
  38. GRB 190129B: Tiled Swift observations
  39. Trigger 886496: Another Swift trigger on MAXI J1348-630
  40. Swift Trigger 886157: MASTER optical observation
  41. Trigger 886486: Swift detection of MAXI J1631-479
  42. Trigger 886266: Another Swift trigger on MAXI J1348-630
  43. Swift Trigger 886157: Swift detection of a new transient Swift J1728.9-3613
  44. Swift Trigger 885960: A third Swift trigger on MAXI J1348-630
  45. Trigger 885845: A second Swift trigger on MAXI J1348-630
  46. Trigger 885807: Swift detection of MAXI J1348-630
  47. GRB 190117A: AstroSat CZTI detection
  48. GRB 190123A: AROMA-N Optical Observation
  49. GRB 190123A: Swift/UVOT Upper Limits
  50. GRB 190123A: Swift-BAT refined analysis
  51. GRB 190123A: GMG observational limit
  52. Trigger 885456: Swift detection of MAXI J1631-479
  53. GRB 190123A: Swift-XRT refined Analysis
  54. GRB 190123A: GOTO optical limit
  55. GRB 190123A: Fermi GBM observation
  56. GRB 190123A: BOOTES-4/MET optical limit
  57. GRB 190123A: Enhanced Swift-XRT position
  58. GRB 190123A: MASTER Global Robotic Net optical observation
  59. GRB 190123A: Swift detection of a burst
  60. IPN Triangulation of GRB 190118A (long)
  61. IPN Triangulation of GRB 190117A (long)
  62. Trigger 884906: Swift detection of MAXI J1631-479
  63. Swift ToO Instructions Update
  64. Swift ToO Website Down
  65. GRB 190106A: Discovery Channel Telescope observations
  66. Konus-Wind observation of GRB 190114C
  67. The Swift-XRT WT mode spectrum of GRB190114C
  68. GRB190114C, Long follow up urged
  69. GRB 190114B: Swift-XRT refined Analysis
  70. GRB 190114C: Swift/UVOT Detection
  71. GRB 190114C: Swift-BAT refined analysis
  72. GRB 190114B, Swift-BAT refined analysis
  73. GRB 190114B: Swift/UVOT Upper Limits
  74. GRB 190114A: Swift/UVOT Observations
  75. GRB 190114C:Insight-HXMT/HE detection
  76. GRB 190114C: AGILE/MCAL detection
  77. GRB 190114C: X-shooter observations of a highly extinguished afterglow
  78. GRB 190114C: Fermi-LAT detection
  79. GRB 190114C: Fermi GBM detection
  80. GRB 190114C: Swift-XRT refined Analysis
  81. GRB 190114C: Enhanced Swift-XRT position
  82. GRB 190114C: GROND detection of the afterglow
  83. MAGIC detects the GRB 190114C in the TeV energy domain
  84. GRB 190114B: BOOTES-4/MET optical afterglow detection
  85. GRB 190114C: MASTER 4-polarizations filters OT detection
  86. GRB 190114B: Enhanced Swift-XRT position
  87. GRB 190114C: MASTER afterglow Detection
  88. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  89. GRB 190114A: OSN Detection
  90. GRB 190114B: Swift detection of a burst
  91. GRB 190114A: Swift-BAT refined analysis
  92. GRB 190103B: Swift/UVOT Upper Limits
  93. GRB 190114A: Swift-XRT refined Analysis
  94. GRB 190114A: GROND detection of the afterglow
  95. GRB 190114A: Enhanced Swift-XRT position
  96. GRB 190114A: VLT/X-shooter redshift
  97. GRB 190114A: Prompt enhanced Swift-XRT position
  98. GRB 190114A: Possible UVOT Detection
  99. GRB 190114A: Swift detection of a burst
  100. GRB 190110A：Insight-HXMT/HE detection

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