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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. GRB 190718A: Swift-BAT refined analysis
  2. LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations
  3. LIGO/Virgo S190718y: Upper limits from Fermi-GBM Observations
  4. LIGO/Virgo S190630ag: Updated sky localization
  5. GRB 190718A: Swift-XRT refined Analysis
  6. LIGO/Virgo S190718y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  7. LIGO/Virgo S190718y : no neutrino counterpart candidate in ANTARES search
  8. GRB 190718A: Swift/UVOT Upper Limits
  9. LIGO/Virgo S190718y Global MASTER-Net observations report
  10. LIGO/Virgo S190718y: Identification of a GW compact binary merger candidate
  11. LIGO/Virgo S190718y: Upper limits from IceCube neutrino searches
  12. GRB 190718A: FRAM-Auger optical limit
  13. GRB 190718A: Enhanced Swift-XRT position
  14. Swift GRB190718.2 Global MASTER-Net observations report
  15. GRB 190718A: Swift detection of a burst
  16. GRB 190613B: FRAM-Auger afterglow detection
  17. Fermi trigger No 585007213 Global MASTER-Net observations report
  18. GRB 190716A: BALROG localization (Fermi Trigger 585007213 / GRB 190716917)
  19. GRB 190716A: Fermi GBM Final Real-time Localization
  20. Fermi trigger No 584977168 Global MASTER-Net observations report
  21. GRB 190714A: an X-ray flare from 2E 1624.6+1504/UCAC4 525-061488
  22. Fermi trigger No 584929684 Global MASTER-Net observations report
  23. Fermi trigger No 584929684 Global MASTER-Net observations report
  24. GRB 190708B: confirmation of the X-ray afterglow
  25. IceCube-190712A: Upper limits from a search for additional neutrino events in IceCube
  26. Fermi trigger No 584804684 Global MASTER-Net observations report
  27. GRB 190714B: Fermi GBM Final Real-time Localization
  28. GRB 190714A: Tiled Swift observations
  29. GRB 190714A: MAXI/GSC detection
  30. Fermi trigger No 584710308 Global MASTER-Net observations report
  31. IceCube-190712A : Upper limits from Insight-HXMT/HE observations
  32. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  33. IceCube-190712A: No neutrino counterpart candidates in ANTARES search
  34. Fermi trigger No 584637077 Global MASTER-Net observations report
  35. IceCube-190712A: Upper limits from Fermi-GBM Observations
  36. GRB 190706D: Insight-HXMT/HE detection
  37. GRB 190706C: Insight-HXMT/HE detection
  38. IceCube Alert 190712.05 Global MASTER-Net observations report
  39. IceCube-190712A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  40. IceCube-190712A - IceCube observation of a high-energy neutrino candidate event
  41. Fermi trigger No 584590606 Global MASTER-Net observations report
  42. GRB 190712A: Fermi GBM Final Real-time Localization
  43. Fermi trigger No 584583925 Global MASTER-Net observations report
  44. GRB 190708B: Swift-XRT observations
  45. LIGO/Virgo S190706ai: Upper limits from Insight-HXMT/HE observations
  46. Fermi trigger No 584465880 Global MASTER-Net observations report
  47. Fermi trigger No 584404689 Global MASTER-Net observations report
  48. LIGO/Virgo S190706ai: Updated sky localization
  49. LIGO/Virgo S190707q: Updated sky localization
  50. Konus-Wind observation of GRB 190706D
  51. LIGO/Virgo S190707q: MASTER OT seach result
  52. LIGO/Virgo S190707q: No counterpart candidates in the CNEOST
  53. LIGO/Virgo S190707q: No counterpart candidates in the Swift/BAT Observations
  54. Konus-Wind observation of GRB 190708B
  55. Konus-Wind observation of GRB 190706C
  56. GRB 190708B: Tiled Swift observations
  57. MAXI GRB190708.83 Global MASTER-Net observations report
  58. GRB 190706C: CALET Gamma-Ray Burst Monitor detection
  59. GRB 190708B: MAXI/GSC detection
  60. IPN triangulation of GRB 190706D (short)
  61. IPN triangulation of GRB 190706C (long/very bright)
  62. Fermi trigger No 584264100 Global MASTER-Net observations report
  63. LIGO/Virgo S190707q: Upper limits from CALET observations
  64. Konus-Wind observation of GRB 190704A
  65. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  66. GRB 190708A: Fermi GBM Final Real-time Localization
  67. LIGO/Virgo S190707q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  68. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  69. LIGO/Virgo S190706ai: No transient candidates from CALET observations
  70. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  71. LIGO/Virgo S190706ai: No counterpart candidates in the Swift/BAT Observations
  72. IPN triangulation of GRB 190704A (short)
  73. GRB 190706B: Swift/UVOT Detection
  74. LIGO/Virgo S190707q Global MASTER-Net observations report
  75. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  76. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  77. LIGO/Virgo S190707q: Upper limits from AGILE-GRID observations
  78. LIGO/Virgo S190707q: No counterpart candidates in AGILE-MCAL observations
  79. LIGO/Virgo S190707q: No counterpart candidates in HAWC observations
  80. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  81. LIGO/Virgo S190701ah: GRAWITA VST-ESO PARANAL observations
  82. LIGO/Virgo S190707q: Coverage and upper limits from MAXI/GSC observations
  83. LIGO/Virgo S190707q : No neutrino counterpart candidates in ANTARES search
  84. LIGO/Virgo S190707q: Identification of a GW compact binary merger candidate
  85. LIGO/Virgo S190707q: Upper limits from IceCube neutrino searches
  86. LIGO/Virgo S190706ai: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  87. LIGO/Virgo S190706ai: No neutrino counterpart candidates in ANTARES search
  88. GRB 190707B: Fermi GBM Final Real-time Localization
  89. LIGO/Virgo S190706ai: Upper limits from AGILE-GRID observations
  90. GRB 190707A: BALROG localization (Fermi Trigger 584175010 / GRB 190707285)
  91. GRB 190707A: Fermi GBM Final Real-time Localization
  92. LIGO/Virgo S190706ai: No counterpart candidates in HAWC observations
  93. GRB 190706B: Swift-BAT refined analysis
  94. LIGO/Virgo S190706ai: Coverage and upper limits from MAXI/GSC observations
  95. LIGO/Virgo S190706ai: No counterpart candidates in AGILE-MCAL observations
  96. LIGO/Virgo S190706ai Global MASTER-Net observations report
  97. GRB 190706B: Swift-XRT refined Analysis
  98. LIGO/Virgo S190706ai: Identification of a GW compact binary merger candidate
  99. LIGO/Virgo S190706ai: Upper limits from IceCube neutrino searches
  100. IceCube-190704A - HAWC follow-up

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