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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"

11651 results found.

  1. GRB 190525A: Fermi GBM Final Real-time Localization
  2. Konus-Wind observation of GRB 190519A
  3. LIGO/Virgo S190521r: Coverage and upper limits from Fermi-LAT observations
  4. LIGO/Virgo S190521r: Upper limits from Fermi-GBM observations
  5. LIGO/Virgo S190521g : Upper limits from Fermi-GBM observations
  6. LIGO/Virgo S190521g: No candidate counterpart in Fermi-LAT observations
  7. LIGO/Virgo S190519bj: Fermi-LAT search for a high-energy gamma-ray counterpart
  8. Fermi GRB190520.6 Global MASTER-Net observations report
  9. GRB 190519A: AstroSat CZTI detection
  10. GRB 190519A: CALET Gamma-Ray Burst Monitor detection
  11. LIGO/Virgo S190519bj: Fermi GBM Observations
  12. GRB 190519A: Fermi GBM observation
  13. GRB 190519A: Fermi GBM Final Real-time Localization
  14. Fermi GRB190517.81 Global MASTER-Net observations report
  15. Fermi Trigger 579814215 / GRB 190517813 / GRB190517A: BALROG localization
  16. GRB 190517A: Fermi GBM Final Real-time Localization
  17. LIGO/Virgo S190517h: Fermi-LAT search for a high-energy gamma-ray counterpart
  18. LIGO/Virgo S190517h: Fermi GBM Observations
  19. GRB 190515A: CALET Gamma-Ray Burst Monitor detection
  20. Fermi GRB190517.1 Global MASTER-Net observations report
  21. Fermi GRB190515.49 Global MASTER-Net observations report
  22. GRB 190515A: Insight-HXMT/HE detection
  23. GRB 190515A: Fermi GBM detection
  24. GRB 190515A: Fermi-LAT detection
  25. Fermi GRB190515.43 Global MASTER-Net observations report
  26. GRB 190510A: CALET Gamma-Ray Burst Monitor detection
  27. GRB 190515A: Fermi GBM Final Real-time Localization
  28. Fermi GRB190514.67 Global MASTER-Net observations report
  29. LIGO/Virgo S190513bm: Fermi GBM Observations
  30. Konus-Wind observation of GRB 190511A
  31. LIGO/Virgo S190513bm: Fermi-LAT search for a high-energy gamma-ray counterpart
  32. LIGO/Virgo S190512at: Fermi-LAT search for a high-energy gamma-ray counterpart
  33. LIGO/Virgo S190512at: Fermi GBM Observations
  34. GRB 190512A: Fermi GBM observation
  35. Fermi GRB190512.62 Global MASTER-Net observations report
  36. Fermi GRB190512.61 Global MASTER-Net observations report
  37. GRB 190512A: Fermi GBM Final Real-time Localization
  38. IPN triangulation of GRB 190510A (short)
  39. GRB 190511A: NOT optical afterglow
  40. GRB 190511A: Fermi-LAT detection
  41. GRB 190511A: Fermi GBM observation
  42. LIGO/Virgo S190510g: DESGW counterpart candidates over 80% of the GW localization area
  43. GRB 190511A: Fermi GBM Final Real-time Localization
  44. LIGO/Virgo S190510g: Fermi-LAT search for a high-energy gamma-ray counterpart
  45. GRB 190510A: Fermi GBM Final Real-time Localization
  46. Fermi GRB190510.12 Global MASTER-Net observations report
  47. LIGO/Virgo S190510g: Fermi GBM Observations
  48. GRB 190508A: GOTO optical search - no counterparts
  49. GRB 190508B: Fermi GBM Final Real-time Localization
  50. Fermi GRB190508.81 Global MASTER-Net observations report
  51. GRB 190508A: Fermi GBM Final Real-time Localization
  52. Fermi GRB190507.71 Global MASTER-Net observations report
  53. GRB 190507B: GOTO optical counterpart search
  54. Fermi GRB190508.11 Global MASTER-Net observations report
  55. Fermi GRB190507.97 Global MASTER-Net observations report
  56. GRB 190507B: Fermi GBM Final Real-time Localization
  57. Fermi GRB190507.27 Global MASTER-Net observations report
  58. IceCube-190504A: MASTER optical monitoring analysis
  59. Fermi Trigger 578903308 / GRB 190507270 / GRB190507A: BALROG localization
  60. GRB 190507A: Fermi GBM Final Real-time Localization
  61. Fermi GRB190506.58 Global MASTER-Net observations report
  62. Update to the Fermi GBM GCN Reporting
  63. IceCube-190504A: Swift-XRT Follow-up Observations
  64. Fermi GRB190505.82 Global MASTER-Net observations report
  65. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  66. Fermi GRB190505.05 Global MASTER-Net observations report
  67. Fermi GRB190504.68 Global MASTER-Net observations report
  68. IPN triangulation of GRB 190504A (short)
  69. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  70. Fermi-LAT Gamma-ray Observations of IceCube-190503A
  71. LIGO/Virgo S190503bf: Fermi-GBM Observations
  72. Fermi-GBM Observations of IceCube-190503A
  73. IceCube-190503A - IceCube observation of a high-energy neutrino candidate event
  74. IPN Triangulation of GRB 190501A (long/bright)
  75. Fermi Trigger 578462495 / GRB 190502168 / GRB190502A: BALROG localization
  76. Fermi GRB190501.79 Global MASTER-Net observations report
  77. Fermi GRB190429.74 Global MASTER-Net observations report
  78. LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
  79. GRB 190427A: CALET Gamma-Ray Burst Monitor detection
  80. Fermi Trigger 578170097 / GRB 190428783 / GRB190428A: BALROG localization
  81. GRB 190419A: AstroSat CZTI detection
  82. Fermi GRB190427.19 Global MASTER-Net observations report
  83. GRB 190427A: Fermi GBM detection
  84. LIGO/Virgo S190425z: Fermi-LAT search for a high-energy gamma-ray counterpart
  85. LIGO/Virgo S190426c: Fermi GBM Observations
  86. LIGO/Virgo S190425z: Candidates from the Zwicky Transient Facility
  87. LIGO/Virgo S190425z: Fermi GBM Observations
  88. LIGO/Virgo S190425z: INTEGRAL IBIS prompt observation
  89. LIGO/Virgo S190421ar: Fermi-LAT search for a high-energy gamma-ray counterpart
  90. Fermi GRB190425.09 Global MASTER-Net observations report
  91. GRB 190422A: Fermi GBM detection
  92. Fermi GRB190422.96 Global MASTER-Net observations report
  93. Fermi GRB190422.67 Global MASTER-Net observations report
  94. LIGO/Virgo S190421ar: Fermi-GBM Observations
  95. Fermi GRB190420.98 Global MASTER-Net observations report
  96. Fermi GRB190419.41 Global MASTER-Net observations report
  97. Fermi trigger 576241792 / GRB 190406B: MASTER optical observation
  98. Fermi Trigger 577360542 / GRB 190419414 / GRB190419A: BALROG localization
  99. Fermi GRB190418.92 Global MASTER-Net observations report
  100. GRB 190406B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 576241792)

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