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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"

27302 results found.

  1. Fermi trigger No 585196946 Global MASTER-Net observations report
  2. LIGO/Virgo S190718y: No counterpart candidates in KAIT observations
  3. GRB 190719C: Swift detection of a burst
  4. GRB 190719C: Fermi GBM Final Real-time Localization
  5. LIGO/Virgo S190718y: Upper limits from Insight-HXMT/HE observations
  6. LIGO/Virgo S190718y: No counterpart candidates in Fermi-LAT observations
  7. LIGO/Virgo S190718y: Coverage and upper limits from MAXI/GSC observations
  8. LIGO/Virgo S190718y: Upper limits from CALET observations
  9. GRB 190719A: Fermi GBM Final Real-time Localization
  10. GRB 190718A: Swift-BAT refined analysis
  11. LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations
  12. LIGO/Virgo S190718y: Upper limits from Fermi-GBM Observations
  13. GRB 190718A: Swift-XRT refined Analysis
  14. GRB 190718A: Swift/UVOT Upper Limits
  15. LIGO/Virgo S190718y Global MASTER-Net observations report
  16. GRB 190718A: FRAM-Auger optical limit
  17. Swift GRB190718.2 Global MASTER-Net observations report
  18. GRB 190718A: Swift detection of a burst
  19. GRB 190613B: FRAM-Auger afterglow detection
  20. Fermi trigger No 585007213 Global MASTER-Net observations report
  21. GRB 190716A: BALROG localization (Fermi Trigger 585007213 / GRB 190716917)
  22. GRB 190716A: Fermi GBM Final Real-time Localization
  23. Fermi trigger No 584977168 Global MASTER-Net observations report
  24. Fermi trigger No 584929684 Global MASTER-Net observations report
  25. Fermi trigger No 584929684 Global MASTER-Net observations report
  26. GRB 190708B: confirmation of the X-ray afterglow
  27. Fermi trigger No 584804684 Global MASTER-Net observations report
  28. GRB 190714B: Fermi GBM Final Real-time Localization
  29. Fermi trigger No 584710308 Global MASTER-Net observations report
  30. IceCube-190712A : Upper limits from Insight-HXMT/HE observations
  31. Fermi trigger No 584637077 Global MASTER-Net observations report
  32. IceCube-190712A: Upper limits from Fermi-GBM Observations
  33. GRB 190706D: Insight-HXMT/HE detection
  34. GRB 190706C: Insight-HXMT/HE detection
  35. IceCube Alert 190712.05 Global MASTER-Net observations report
  36. Fermi trigger No 584590606 Global MASTER-Net observations report
  37. GRB 190712A: Fermi GBM Final Real-time Localization
  38. Fermi trigger No 584583925 Global MASTER-Net observations report
  39. LIGO/Virgo S190706ai: Upper limits from Insight-HXMT/HE observations
  40. Fermi trigger No 584465880 Global MASTER-Net observations report
  41. Fermi trigger No 584404689 Global MASTER-Net observations report
  42. Konus-Wind observation of GRB 190706D
  43. LIGO/Virgo S190707q: No counterpart candidates in the Swift/BAT Observations
  44. Konus-Wind observation of GRB 190708B
  45. Konus-Wind observation of GRB 190706C
  46. MAXI GRB190708.83 Global MASTER-Net observations report
  47. GRB 190706C: CALET Gamma-Ray Burst Monitor detection
  48. IPN triangulation of GRB 190706D (short)
  49. IPN triangulation of GRB 190706C (long/very bright)
  50. Fermi trigger No 584264100 Global MASTER-Net observations report
  51. LIGO/Virgo S190707q: Upper limits from CALET observations
  52. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  53. GRB 190708A: Fermi GBM Final Real-time Localization
  54. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  55. LIGO/Virgo S190706ai: No transient candidates from CALET observations
  56. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  57. LIGO/Virgo S190706ai: No counterpart candidates in the Swift/BAT Observations
  58. IPN triangulation of GRB 190704A (short)
  59. GRB 190706B: Swift/UVOT Detection
  60. LIGO/Virgo S190707q Global MASTER-Net observations report
  61. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  62. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  63. LIGO/Virgo S190707q: No counterpart candidates in HAWC observations
  64. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  65. LIGO/Virgo S190707q: Coverage and upper limits from MAXI/GSC observations
  66. GRB 190707B: Fermi GBM Final Real-time Localization
  67. LIGO/Virgo S190706ai: Upper limits from AGILE-GRID observations
  68. GRB 190707A: BALROG localization (Fermi Trigger 584175010 / GRB 190707285)
  69. GRB 190707A: Fermi GBM Final Real-time Localization
  70. LIGO/Virgo S190706ai: No counterpart candidates in HAWC observations
  71. GRB 190706B: Swift-BAT refined analysis
  72. LIGO/Virgo S190706ai: Coverage and upper limits from MAXI/GSC observations
  73. LIGO/Virgo S190706ai Global MASTER-Net observations report
  74. GRB 190706B: Swift-XRT refined Analysis
  75. GRB 190706B: Swift detection of a burst
  76. Fermi trigger No 584007338 Global MASTER-Net observations report
  77. IceCube-190704A: Upper limits from Insight-HXMT/HE observations
  78. GRB 190627A: Discovery Channel Telescope late time observations
  79. IceCube-190704A: not observable by Fermi-GBM
  80. Trigger 913042: Swift triggered on noise peak
  81. IceCube Alert 190704.78 Global MASTER-Net observations report
  82. Baksan Neutrino Observatory Alert 190703.21 Global MASTER-Net observations report
  83. Baksan Neutrino Observatory Alert 190703.56 Global MASTER-Net observations report
  84. Fermi trigger No 583854113 Global MASTER-Net observations report
  85. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  86. GRB 190701A, Swift-BAT refined analysis
  87. LIGO/Virgo S190701ah: No transient candidates from CALET observations
  88. LIGO/Virgo S190701ah: Upper limits from Insight-HXMT/HE observations
  89. Fermi Gamma-ray Burst Monitor trigger 190626526/583245413 is not a GRB
  90. LIGO/Virgo S190701ah: No counterpart candidates in the Swift/BAT Observations
  91. IPN triangulation of GRB 190630A (short)
  92. LIGO/Virgo S190630ag: Upper limits from Insight-HXMT/HE observations
  93. LIGO/Virgo S190701ah: Upper limits from Fermi-GBM Observations
  94. GRB 190701A: Swift-XRT refined Analysis
  95. LIGO/Virgo S190630ag: Upper limits from CALET observations
  96. LIGO/Virgo S190701ah Global MASTER-Net observations report
  97. GRB 190630C: Swift-XRT refined Analysis
  98. LIGO/Virgo S190630ag: No counterpart candidates in KAIT observation
  99. LIGO/Virgo S190701ah: Coverage and upper limits from MAXI/GSC observations
  100. GRB 190701A: Swift/UVOT Upper Limits

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