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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"

27301 results found.

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

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