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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"

37775 results found.

  1. GRB 190515A: Insight-HXMT/HE detection
  2. GRB 190515A: Fermi GBM detection
  3. GRB 190515B: Swift-XRT refined Analysis
  4. GRB 190515A: Fermi-LAT detection
  5. Fermi GRB190515.43 Global MASTER-Net observations report
  6. GRB 190515B: Optical observations from OSN
  7. GRB 190515B: Enhanced Swift-XRT position
  8. GRB 190515B: Kitab Observatory optical upper limit
  9. Correction to GRB name for Swift trigger 903845
  10. GRB 190515B: Prompt enhanced Swift-XRT position
  11. GRB 190515B: Swift detection of a burst
  12. GRB 190510A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 190515A: Fermi GBM Final Real-time Localization
  14. Fermi GRB190514.67 Global MASTER-Net observations report
  15. LIGO/Virgo S190513bm: Swift/BAT Counterpart Search
  16. LIGO/Virgo S190513bm: Insight-HXMT/HE observation
  17. GRB 190510B: AstroSat CZTI detection
  18. LIGO/Virgo S190513bm: Fermi GBM Observations
  19. GRB 180416D: AstroSat CZTI detection
  20. Konus-Wind observation of GRB 190511A
  21. Konus-Wind observation of GRB 190510A
  22. LIGO/Virgo S190513bm: Fermi-LAT search for a high-energy gamma-ray counterpart
  23. LIGO/Virgo S190513bm: INTEGRAL prompt observation
  24. LIGO/Virgo S190512at: Insight-HXMT/HE observation
  25. GRB 190512A: Swift-BAT refined analysis
  26. LIGO/Virgo S190512at: Swift/BAT Counterpart Search
  27. LIGO/Virgo S190512at: Fermi-LAT search for a high-energy gamma-ray counterpart
  28. LIGO/Virgo S190512at: Fermi GBM Observations
  29. GRB 190512A: Fermi GBM observation
  30. Fermi GRB190512.62 Global MASTER-Net observations report
  31. Fermi GRB190512.61 Global MASTER-Net observations report
  32. GRB 190511A: Swift-BAT refined analysis
  33. GRB 190512A: Swift detection of a burst
  34. GRB 190512A: Fermi GBM Final Real-time Localization
  35. GRB 190511A: Swift-XRT refined Analysis
  36. IPN triangulation of GRB 190510A (short)
  37. GRB 190511A: Swift/UVOT Detection
  38. GRB 190511A: NOT optical afterglow
  39. GRB 190511A: Fermi-LAT detection
  40. GRB 190511A: Fermi GBM observation
  41. GRB 190511A: Enhanced Swift-XRT position
  42. LIGO/Virgo S190510g: DESGW counterpart candidates over 80% of the GW localization area
  43. GRB 190511A: Swift detection of a burst
  44. GRB 190511A: Fermi GBM Final Real-time Localization
  45. LIGO/Virgo S190510g: Insight-HXMT/HE updated observation
  46. LIGO/Virgo S190510g: Fermi-LAT search for a high-energy gamma-ray counterpart
  47. LIGO/Virgo S190510g: Swift/BAT Counterpart Search
  48. Konus-Wind observation of GRB 190501A
  49. LIGO/Virgo S190510g: Insight-HXMT/HE observation
  50. GRB 190510A: Fermi GBM Final Real-time Localization
  51. Fermi GRB190510.12 Global MASTER-Net observations report
  52. LIGO/Virgo S190510g: Fermi GBM Observations
  53. GRB 190508A: GOTO optical search - no counterparts
  54. GRB 190508B: Fermi GBM Final Real-time Localization
  55. Fermi GRB190508.81 Global MASTER-Net observations report
  56. GRB 190508A: Fermi GBM Final Real-time Localization
  57. Fermi GRB190507.71 Global MASTER-Net observations report
  58. GRB 190507B: GOTO optical counterpart search
  59. Fermi GRB190508.11 Global MASTER-Net observations report
  60. Fermi GRB190507.97 Global MASTER-Net observations report
  61. GRB 190507B: Fermi GBM Final Real-time Localization
  62. Fermi GRB190507.27 Global MASTER-Net observations report
  63. GRB 190501A: Swift XRT and UVOT Observations
  64. LIGO/Virgo S190426c: Konus-Wind observations
  65. LIGO/Virgo S190425z: Konus-Wind observations
  66. IceCube-190504A: MASTER optical monitoring analysis
  67. Fermi Trigger 578903308 / GRB 190507270 / GRB190507A: BALROG localization
  68. GRB 190507A: Fermi GBM Final Real-time Localization
  69. Fermi GRB190506.58 Global MASTER-Net observations report
  70. Update to the Fermi GBM GCN Reporting
  71. IceCube-190504A: Insight-HXMT/HE observation
  72. GRB 190501A: CALET Gamma-Ray Burst Monitor detection
  73. IceCube-190504A: Swift-XRT Follow-up Observations
  74. Fermi GRB190505.82 Global MASTER-Net observations report
  75. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  76. IceCube-190503A: Insight-HXMT/HE observation
  77. Fermi GRB190505.05 Global MASTER-Net observations report
  78. Fermi GRB190504.68 Global MASTER-Net observations report
  79. IPN triangulation of GRB 190504A (short)
  80. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  81. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  82. IceCube-190503A: Insight-HXMT/HE observation
  83. Fermi-LAT Gamma-ray Observations of IceCube-190503A
  84. LIGO/Virgo S190503bf: Fermi-GBM Observations
  85. Fermi-GBM Observations of IceCube-190503A
  86. IceCube-190503A: INTEGRAL prompt observation
  87. LIGO/Virgo S190503bf: INTEGRAL prompt observation
  88. IceCube-190503A - IceCube observation of a high-energy neutrino candidate event
  89. Correction in name: GRB 190501B (not GRB 190501BA) : AstroSat CZTI detection
  90. GRB 190501B: AstroSat CZTI detection
  91. IPN Triangulation of GRB 190501A (long/bright)
  92. GRB 190501A: Swift ToO observations
  93. GRB 190501A: GOTO optical counterpart search
  94. Fermi Trigger 578462495 / GRB 190502168 / GRB190502A: BALROG localization
  95. Fermi GRB190501.79 Global MASTER-Net observations report
  96. GRB 190501A: refined position from AGILE/GRID analysis
  97. GRB 190501A: AGILE/GRID detection
  98. GRB 190501A: AGILE/MCAL and scientific ratemeters detection of a burst
  99. GRB 190429A: AstroSat CZTI detection
  100. Fermi GRB190429.74 Global MASTER-Net observations report

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