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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"

37791 results found.

  1. LIGO/Virgo S190727h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  2. Fermi trigger No 585864875 Global MASTER-Net observations report
  3. Fermi trigger No 585847498 Global MASTER-Net observations report
  4. GRB 190726B: BALROG localization (Fermi Trigger 585864875 / GRB 190726843)
  5. GRB 190726B: Fermi GBM Final Real-time Localization
  6. Fermi trigger No 585856427 Global MASTER-Net observations report
  7. GRB 190726A: BALROG localization (Fermi Trigger 585847498 / GRB 190726642)
  8. GRB 190726A: Fermi GBM Final Real-time Localization
  9. GRB 190724A: Insight-HXMT/HE detection
  10. GRB 190723A: Insight-HXMT/HE detection
  11. GRB 190720A: CALET Gamma-Ray Burst Monitor detection
  12. IPN triangulation of GRB 190724A (short)
  13. GRB 190719C: optical afterglow confirmation
  14. Fermi trigger No 585621841 Global MASTER-Net observations report
  15. GRB 190724A: Fermi GBM Final Real-time Localization
  16. Fermi trigger No 585559462 Global MASTER-Net observations report
  17. GRB 190723A: Fermi GBM Final Real-time Localization
  18. IPN triangulation of GRB 190720A
  19. GRB 190720B: Insight-HXMT/HE detection
  20. LIGO/Virgo S190720a: No counterpart candidates in Fermi-LAT observations
  21. GRB 190720B: Fermi GBM Final Real-time Localization
  22. GRB 190720A: Fermi GBM detection
  23. GRB 190719C: Fermi GBM detection
  24. GRB 190719C: Swift-BAT refined analysis
  25. GRB 190719C: Swift/UVOT Upper Limits
  26. LIGO/Virgo S190720a: No counterpart candidates in the Swift/BAT Observations
  27. GRB 190719C: Swift-XRT light-curve fit
  28. GRB 190719C: Swift-XRT refined Analysis
  29. GRB 190720A: BALROG localization (Fermi Trigger 585326534 / GRB 190720613)
  30. GRB 190720A: Fermi GBM Final Real-time Localization
  31. LIGO/Virgo S190720a: Upper limits from Fermi-GBM Observations
  32. LIGO/Virgo S190720a: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  33. Fermi trigger No 585196946 Global MASTER-Net observations report
  34. GRB 190719C: NOT candidate optical afterglow and host
  35. GRB 190719C: Swift detection of a burst
  36. GRB 190719C: Fermi GBM Final Real-time Localization
  37. LIGO/Virgo S190718y: Upper limits from Insight-HXMT/HE observations
  38. LIGO/Virgo S190718y: No counterpart candidates in Fermi-LAT observations
  39. GRB 190719B: a long GRB detected by INTEGRAL
  40. GRB 190719A: Fermi GBM Final Real-time Localization
  41. GRB 190718A: Swift-BAT refined analysis
  42. LIGO/Virgo S190718y: Upper limits from Fermi-GBM Observations
  43. GRB 190718A: Swift-XRT refined Analysis
  44. LIGO/Virgo S190718y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  45. GRB 190718A: Swift/UVOT Upper Limits
  46. GRB 190718A: FRAM-Auger optical limit
  47. GRB 190718A: Enhanced Swift-XRT position
  48. GRB 190718A: Swift detection of a burst
  49. GRB 190613B: FRAM-Auger afterglow detection
  50. Fermi trigger No 585007213 Global MASTER-Net observations report
  51. GRB 190716A: BALROG localization (Fermi Trigger 585007213 / GRB 190716917)
  52. GRB 190716A: Fermi GBM Final Real-time Localization
  53. Fermi trigger No 584977168 Global MASTER-Net observations report
  54. GRB 190714A: an X-ray flare from 2E 1624.6+1504/UCAC4 525-061488
  55. Fermi trigger No 584929684 Global MASTER-Net observations report
  56. Fermi trigger No 584929684 Global MASTER-Net observations report
  57. GRB 190708B: confirmation of the X-ray afterglow
  58. Fermi trigger No 584804684 Global MASTER-Net observations report
  59. GRB 190714B: Fermi GBM Final Real-time Localization
  60. GRB 190714A: Tiled Swift observations
  61. GRB 190714A: MAXI/GSC detection
  62. Fermi trigger No 584710308 Global MASTER-Net observations report
  63. IceCube-190712A : Upper limits from Insight-HXMT/HE observations
  64. Fermi-LAT Gamma-ray Observations of IceCube-190712A
  65. Fermi trigger No 584637077 Global MASTER-Net observations report
  66. IceCube-190712A: Upper limits from Fermi-GBM Observations
  67. GRB 190706D: Insight-HXMT/HE detection
  68. GRB 190706C: Insight-HXMT/HE detection
  69. IceCube-190712A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  70. IceCube-190712A - IceCube observation of a high-energy neutrino candidate event
  71. Fermi trigger No 584590606 Global MASTER-Net observations report
  72. GRB 190712A: Fermi GBM Final Real-time Localization
  73. Fermi trigger No 584583925 Global MASTER-Net observations report
  74. GRB 190708B: Swift-XRT observations
  75. LIGO/Virgo S190706ai: Upper limits from Insight-HXMT/HE observations
  76. Fermi trigger No 584465880 Global MASTER-Net observations report
  77. Fermi trigger No 584404689 Global MASTER-Net observations report
  78. Konus-Wind observation of GRB 190706D
  79. LIGO/Virgo S190707q: No counterpart candidates in the Swift/BAT Observations
  80. Konus-Wind observation of GRB 190708B
  81. Konus-Wind observation of GRB 190706C
  82. GRB 190708B: Tiled Swift observations
  83. GRB 190706C: CALET Gamma-Ray Burst Monitor detection
  84. GRB 190708B: MAXI/GSC detection
  85. IPN triangulation of GRB 190706D (short)
  86. IPN triangulation of GRB 190706C (long/very bright)
  87. Fermi trigger No 584264100 Global MASTER-Net observations report
  88. Konus-Wind observation of GRB 190704A
  89. LIGO/Virgo S190707q: No counterpart candidates in Fermi-LAT observations
  90. GRB 190708A: Fermi GBM Final Real-time Localization
  91. LIGO/Virgo S190707q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  92. LIGO/Virgo S190707q: Upper limits from Fermi-GBM Observations
  93. LIGO/Virgo S190706ai: No counterpart candidates in the Swift/BAT Observations
  94. IPN triangulation of GRB 190704A (short)
  95. GRB 190706B: Swift/UVOT Detection
  96. LIGO/Virgo S190706ai: No counterpart candidates in Fermi-LAT observations
  97. LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations
  98. LIGO/Virgo S190706ai: Upper limits from Fermi-GBM Observations
  99. LIGO/Virgo S190706ai: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observations
  100. GRB 190707B: Fermi GBM Final Real-time Localization

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