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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"

19663 results found.

  1. GRB 191123A: Swift/UVOT further analysis
  2. GRB 191123A: Swift-BAT refined analysis
  3. GRB 191123A: Swift-XRT refined Analysis
  4. GRB 191123A: Enhanced Swift-XRT position
  5. GRB 191123A: Swift/UVOT detection
  6. GRB 191123A: Swift detection of a burst with an optical counterpart
  7. GRB 191122A: Swift/UVOT Upper Limits
  8. GRB 191122A: Swift-BAT refined analysis
  9. GRB 191122A: Swift-XRT refined Analysis
  10. GRB 191122A: BOOTES-4/MET optical limit
  11. GRB 191122A: Enhanced Swift-XRT position
  12. GRB 191122A: Prompt enhanced Swift-XRT position
  13. GRB 191122A: Swift detection of a burst
  14. Swift Trigger 937114 is not an astrophysical source
  15. Swift GRB191115A: Global MASTER-Net observations report
  16. Announcing the GW Treasure Map
  17. GRB 191031D: CALET Gamma-Ray Burst Monitor detection
  18. LIGO/Virgo S191110af: Swift XRT observations, no secure afterglow found
  19. LIGO/Virgo S191110af: no counterpart candidates in the Swift/BAT observations
  20. LIGO/Virgo S191109d: no counterpart candidates in the Swift/BAT observations
  21. GRB 191106A: AstroSat CZTI detection
  22. GRB 191106A: Swift/UVOT Upper Limits
  23. GRB 191106A: Swift-BAT refined analysis
  24. LIGO/Virgo S191105e: no counterpart candidates in the Swift/BAT observations
  25. GRB 191106A: Swift-XRT refined Analysis
  26. GRB 191106A: BOOTES-4/MET optical limit
  27. GRB 191106A: MASTER optical observation
  28. GRB 191106A: Swift detection of a burst
  29. GRB191016A GROND observations
  30. Swift trigger 933276 MASTER observation
  31. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  32. Swift GRB191105.01: Global MASTER-Net observations report
  33. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  34. Swift GRB191105.01: Global MASTER-Net OT detection
  35. GRB 191101A: Swift-BAT refined analysis
  36. GRB 191101A: Swift/UVOT Upper Limits
  37. SGR 1935+2154: Swift-BAT refined analysis
  38. GRB 191104B/GRB 191104C are SGR 1935+2154
  39. Trigger 933083: Swift detection of SGR 1935+2154
  40. GRB 191031D: Zwicky Transient Facility Follow-Up of a Swift Short GRB (Trigger 594249816/191031891)
  41. GRB 191031C: Insight-HXMT/HE detection
  42. GRB 191101A: Swift-XRT refined Analysis
  43. GRB 191101A: VIRT Optical Upper Limits
  44. GRB 191101A: Enhanced Swift-XRT position
  45. Swift GRB191101.88: Global MASTER-Net observations report
  46. GRB 191101A: Prompt enhanced Swift-XRT position
  47. GRB 191101A: Swift detection of a burst
  48. GRB 191031D: Swift-BAT refined analysis
  49. GRB 191031C: Swift-BAT refined analysis
  50. GRB 191031A: Swift-BAT refined analysis
  51. GRB 191031C: Swift-XRT refined Analysis
  52. GRB 191031D: AstroSat CZTI detection
  53. GRB 191031D: Swift/UVOT Upper Limits
  54. GRB 191031C: Swift/UVOT Detection
  55. Konus-Wind observation of GRB 191031D
  56. GRB 191031D: Swift-XRT refined Analysis
  57. GRB 191031D: AGILE/MCAL observations
  58. GRB 191031D: RATIR Optical and NIR Observations
  59. GRB 191031C: Fermi GBM detection
  60. GRB 191031D: Fermi GBM detection
  61. GRB 191031D: Enhanced Swift-XRT position
  62. GRB 191031A: Fermi GBM detection
  63. GRB 191031C: Enhanced Swift-XRT position
  64. Swift GRB191031.89: Global MASTER-Net observations report
  65. GRB 191031D: Swift detection of a short hard burst
  66. GRB 191029A: Swift-BAT refined analysis
  67. GRB 191031C: Prompt enhanced Swift-XRT position
  68. GRB 191031C: Swift detection of a burst
  69. GRB 191031A: Swift detection of a burst
  70. GRB 191029A: CORRECTED Swift-XRT refined analysis
  71. GRB 191029A: Swift/UVOT Upper Limits
  72. GRB 191029A: Enhanced Swift-XRT position
  73. GRB 191029A: Swift-XRT refined Analysis
  74. GRB 191029A: BOOTES-4/MET optical limit
  75. GRB 191029A: Swift-XRT observations
  76. GRB 191029A: Swift detection of a burst
  77. IPN triangulation of GRB 191027A
  78. Swift/BAT Trigger 931384 is not a GRB ( 191025A )
  79. Swift Trigger 931484 is not a GRB
  80. Possible GRB 191025A: FRAM-Auger optical limit
  81. Swift Trigger 931384: possible GRB 191025A
  82. GRB 191024A: Swift-BAT refined analysis
  83. GRB 191024A: Swift/UVOT Upper Limits
  84. GRB 191024A: Afterglow Upper Limits with LCO
  85. GRB 191024A: Swift-XRT refined Analysis
  86. GRB 191024A: GROND early upper limits
  87. GRB191024A: MASTER optical observation
  88. GRB 191024A: Enhanced Swift-XRT position
  89. GRB 191024A: Swift detection of a burst
  90. Swift GRB191020.89: Global MASTER-Net OT detection
  91. GRB 191019A: Swift/UVOT Detection
  92. HAWC-191019A: No Neutrino Counterpart detected with ANTARES
  93. GRB 191019A: Swift-XRT updated analysis
  94. Swift GRB191020.81: Global MASTER-Net OT detection
  95. GRB 191019A: Swift-BAT refined analysis
  96. GRB 191019A: Swift-XRT refined Analysis
  97. Swift GRB191019.67: Global MASTER-Net observations report
  98. GRB 191019A: Enhanced Swift-XRT position
  99. GRB 191019A: GROND observations
  100. GRB 191019A: Swift-XRT observations

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