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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"

37788 results found.

  1. Fermi Trigger 579814215 / GRB 190517813 / GRB190517A: BALROG localization
  2. GRB 190517A: Fermi GBM Final Real-time Localization
  3. LIGO/Virgo S190517h: Fermi-LAT search for a high-energy gamma-ray counterpart
  4. LIGO/Virgo S190517h: Swift/BAT Counterpart Search
  5. LIGO/Virgo S190517h: Insight-HXMT/HE observations
  6. LIGO/Virgo S190517h: Fermi GBM Observations
  7. GRB 190515A: CALET Gamma-Ray Burst Monitor detection
  8. LIGO/Virgo S190517h: INTEGRAL/SPI-ACS prompt observation
  9. Fermi GRB190517.1 Global MASTER-Net observations report
  10. GRB 190515B: Swift/UVOT Upper Limits
  11. GRB 190515B: BOOTES-4/MET and 2.2m CAHA optical limits
  12. Fermi GRB190515.49 Global MASTER-Net observations report
  13. GRB 190515B: Swift-BAT refined analysis
  14. GRB 190515A: Insight-HXMT/HE detection
  15. GRB 190515A: Fermi GBM detection
  16. GRB 190515B: Swift-XRT refined Analysis
  17. GRB 190515A: Fermi-LAT detection
  18. Fermi GRB190515.43 Global MASTER-Net observations report
  19. GRB 190515B: Optical observations from OSN
  20. GRB 190515B: Enhanced Swift-XRT position
  21. GRB 190515B: Kitab Observatory optical upper limit
  22. Correction to GRB name for Swift trigger 903845
  23. GRB 190515B: Prompt enhanced Swift-XRT position
  24. GRB 190515B: Swift detection of a burst
  25. GRB 190510A: CALET Gamma-Ray Burst Monitor detection
  26. GRB 190515A: Fermi GBM Final Real-time Localization
  27. Fermi GRB190514.67 Global MASTER-Net observations report
  28. LIGO/Virgo S190513bm: Swift/BAT Counterpart Search
  29. LIGO/Virgo S190513bm: Insight-HXMT/HE observation
  30. GRB 190510B: AstroSat CZTI detection
  31. LIGO/Virgo S190513bm: Fermi GBM Observations
  32. GRB 180416D: AstroSat CZTI detection
  33. Konus-Wind observation of GRB 190511A
  34. Konus-Wind observation of GRB 190510A
  35. LIGO/Virgo S190513bm: Fermi-LAT search for a high-energy gamma-ray counterpart
  36. LIGO/Virgo S190513bm: INTEGRAL prompt observation
  37. LIGO/Virgo S190512at: Insight-HXMT/HE observation
  38. GRB 190512A: Swift-BAT refined analysis
  39. LIGO/Virgo S190512at: Swift/BAT Counterpart Search
  40. LIGO/Virgo S190512at: Fermi-LAT search for a high-energy gamma-ray counterpart
  41. LIGO/Virgo S190512at: Fermi GBM Observations
  42. GRB 190512A: Fermi GBM observation
  43. Fermi GRB190512.62 Global MASTER-Net observations report
  44. Fermi GRB190512.61 Global MASTER-Net observations report
  45. GRB 190511A: Swift-BAT refined analysis
  46. GRB 190512A: Swift detection of a burst
  47. GRB 190512A: Fermi GBM Final Real-time Localization
  48. GRB 190511A: Swift-XRT refined Analysis
  49. IPN triangulation of GRB 190510A (short)
  50. GRB 190511A: Swift/UVOT Detection
  51. GRB 190511A: NOT optical afterglow
  52. GRB 190511A: Fermi-LAT detection
  53. GRB 190511A: Fermi GBM observation
  54. GRB 190511A: Enhanced Swift-XRT position
  55. LIGO/Virgo S190510g: DESGW counterpart candidates over 80% of the GW localization area
  56. GRB 190511A: Swift detection of a burst
  57. GRB 190511A: Fermi GBM Final Real-time Localization
  58. LIGO/Virgo S190510g: Insight-HXMT/HE updated observation
  59. LIGO/Virgo S190510g: Fermi-LAT search for a high-energy gamma-ray counterpart
  60. LIGO/Virgo S190510g: Swift/BAT Counterpart Search
  61. Konus-Wind observation of GRB 190501A
  62. LIGO/Virgo S190510g: Insight-HXMT/HE observation
  63. GRB 190510A: Fermi GBM Final Real-time Localization
  64. Fermi GRB190510.12 Global MASTER-Net observations report
  65. LIGO/Virgo S190510g: Fermi GBM Observations
  66. GRB 190508A: GOTO optical search - no counterparts
  67. GRB 190508B: Fermi GBM Final Real-time Localization
  68. Fermi GRB190508.81 Global MASTER-Net observations report
  69. GRB 190508A: Fermi GBM Final Real-time Localization
  70. Fermi GRB190507.71 Global MASTER-Net observations report
  71. GRB 190507B: GOTO optical counterpart search
  72. Fermi GRB190508.11 Global MASTER-Net observations report
  73. Fermi GRB190507.97 Global MASTER-Net observations report
  74. GRB 190507B: Fermi GBM Final Real-time Localization
  75. Fermi GRB190507.27 Global MASTER-Net observations report
  76. GRB 190501A: Swift XRT and UVOT Observations
  77. LIGO/Virgo S190426c: Konus-Wind observations
  78. LIGO/Virgo S190425z: Konus-Wind observations
  79. IceCube-190504A: MASTER optical monitoring analysis
  80. Fermi Trigger 578903308 / GRB 190507270 / GRB190507A: BALROG localization
  81. GRB 190507A: Fermi GBM Final Real-time Localization
  82. Fermi GRB190506.58 Global MASTER-Net observations report
  83. Update to the Fermi GBM GCN Reporting
  84. IceCube-190504A: Insight-HXMT/HE observation
  85. GRB 190501A: CALET Gamma-Ray Burst Monitor detection
  86. IceCube-190504A: Swift-XRT Follow-up Observations
  87. Fermi GRB190505.82 Global MASTER-Net observations report
  88. Fermi-LAT Gamma-ray Observations of IceCube-190504A
  89. IceCube-190503A: Insight-HXMT/HE observation
  90. Fermi GRB190505.05 Global MASTER-Net observations report
  91. Fermi GRB190504.68 Global MASTER-Net observations report
  92. IPN triangulation of GRB 190504A (short)
  93. LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
  94. LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
  95. IceCube-190503A: Insight-HXMT/HE observation
  96. Fermi-LAT Gamma-ray Observations of IceCube-190503A
  97. LIGO/Virgo S190503bf: Fermi-GBM Observations
  98. Fermi-GBM Observations of IceCube-190503A
  99. IceCube-190503A: INTEGRAL prompt observation
  100. LIGO/Virgo S190503bf: INTEGRAL prompt observation

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