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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"

865 results found.

  1. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  2. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  3. Konus-Wind observation of the recent SGR 1935+2154 activity
  4. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  5. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  6. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  7. INTEGRAL shows increasing activity in SGR J1935+2154
  8. INTEGRAL detection of a burst from SGR J1935+2154
  9. INTEGRAL detection of a burst from SGR J1935+2154
  10. Fermi GBM trigger 686350260/221001869 is not a GRB
  11. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  12. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  14. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  15. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  16. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  17. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  18. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  19. GRB 220518A: Swift/UVOT Detection
  20. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  21. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  22. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  23. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  24. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  25. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  26. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  27. GRB 220228A: Fermi-LAT detection
  28. GRB 220101A: The first example of a Petanova
  29. GRB 220211A: redshift lower limit estimating
  30. Fermi GBM trigger 666393834/220212892 is not a GRB
  31. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  32. GECAM observations of a series of bursts from SGR J1935+2154
  33. AGILE observations of a bright burst from SGR 1935+2154
  34. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  35. IPN triangulation of a bright burst from SGR 1935+2154
  36. Konus-Wind observation of the recent SGR 1935+2154 activity
  37. GECAM observations of a series of bursts from SGR J1935+2154
  38. GECAM observations of a series of bursts from SGR J1935+2154
  39. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  40. AGILE observations of a burst from SGR 1935+2154
  41. GECAM observations of a series of bursts from SGR J1935+2154
  42. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  43. GECAM observations of a series of bursts from SGR J1935+2154
  44. GECAM observation of a burst from SGR J1555.2-5402
  45. GECAM detection of a short burst from SGR 1935+2154
  46. GECAM observations of a series of bursts from SGR J1935+2154
  47. GRB 211229A: GECAM detection
  48. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  49. AGILE observations of a bright burst from SGR 1935+2154
  50. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  51. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  52. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  53. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  54. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  55. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  56. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  57. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  58. GECAM detection of a short burst probably from SGR J1555.2-5402
  59. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  60. GECAM observation of a burst from SGR J1555.2-5402
  61. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  62. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  63. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  64. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  65. Konus-Wind observation of the recent SGR 1935+2154 activity
  66. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  67. AGILE observations of two bright bursts from SGR 1935+2154
  68. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  69. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  70. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  71. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  72. IPN triangulation of a bright burst from SGR 1935+2154
  73. GECAM observations of a series of bursts from SGR J1935+2154
  74. Swift detection of a burst from SGR Swift J1555.2-5402
  75. GECAM observation of a burst from SGR J1935+2154
  76. GECAM observation of a burst from SGR J1935+2154
  77. GECAM observation of a burst from SGR J1555.2-5402
  78. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  79. Fermi GBM observation of a burst from SGR J1555.2-5402
  80. POLAR detection of a SGR-like burst
  81. Swift detection of an outburst from SGR Swift J1555.2-5402
  82. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  83. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  84. IPN Triangulation of a bright burst from SGR 1935+2154
  85. IceCube-210730A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  86. IceCube-210717A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  87. GECAM detection of a short burst from SGR J1935+2154
  88. Recent activity of SGR 1935+2154 as observed by CGBM
  89. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  90. GECAM detection of a short burst from SGR J1935+2154
  91. GECAM detection of a short burst from SGR J1935+2154
  92. GECAM detection of a short burst from SGR 1935+2154
  93. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  94. GECAM detection of a short burst from SGR 1935+2154
  95. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  96. Fermi GBM Observations of SGR J1935+2154
  97. Swift-BAT detection of a burst from SGR 1935+2154
  98. GECAM detection of a bright short burst from SGR 1935+2154
  99. INTEGRAL detection of a burst from SGR 1935+2154
  100. IceCube-210516A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation

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