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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"

892 results found.

  1. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  2. SGR 1806-20: Correction to GCN 33494
  3. INTEGRAL detection of a burst from SGR 1806-200
  4. VZLUSAT-2 detection of SGR 1806-20
  5. GRB 230307A: soft X-ray detection with LEIA
  6. Trigger 1159327: Swift detection of SGR1806-20
  7. GRB 230307A: GECAM detection of an extremely bright burst
  8. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  9. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  10. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  11. Fermi-LAT gamma-ray observations of IceCube-230112A
  12. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  13. Fermi-LAT gamma-ray observations of IceCube-221223A
  14. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  15. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  16. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  17. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  18. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  19. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  20. SGR 1935+2154: AstroSat CZTI Detections
  21. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  22. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  23. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  24. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  25. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  26. SGR 1935+2154: Detection by GRBAlpha
  27. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  28. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  29. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  30. Konus-Wind observation of the recent SGR 1935+2154 activity
  31. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  32. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  33. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  34. INTEGRAL shows increasing activity in SGR J1935+2154
  35. INTEGRAL detection of a burst from SGR J1935+2154
  36. INTEGRAL detection of a burst from SGR J1935+2154
  37. Fermi GBM trigger 686350260/221001869 is not a GRB
  38. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  39. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  40. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  41. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  42. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  43. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  44. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  45. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  46. GRB 220518A: Swift/UVOT Detection
  47. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  48. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  49. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  50. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  51. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  52. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  53. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  54. GRB 220228A: Fermi-LAT detection
  55. GRB 220101A: The first example of a Petanova
  56. GRB 220211A: redshift lower limit estimating
  57. Fermi GBM trigger 666393834/220212892 is not a GRB
  58. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  59. GECAM observations of a series of bursts from SGR J1935+2154
  60. AGILE observations of a bright burst from SGR 1935+2154
  61. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  62. IPN triangulation of a bright burst from SGR 1935+2154
  63. Konus-Wind observation of the recent SGR 1935+2154 activity
  64. GECAM observations of a series of bursts from SGR J1935+2154
  65. GECAM observations of a series of bursts from SGR J1935+2154
  66. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  67. AGILE observations of a burst from SGR 1935+2154
  68. GECAM observations of a series of bursts from SGR J1935+2154
  69. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  70. GECAM observations of a series of bursts from SGR J1935+2154
  71. GECAM observation of a burst from SGR J1555.2-5402
  72. GECAM detection of a short burst from SGR 1935+2154
  73. GECAM observations of a series of bursts from SGR J1935+2154
  74. GRB 211229A: GECAM detection
  75. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  76. AGILE observations of a bright burst from SGR 1935+2154
  77. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  78. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  79. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  80. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  81. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  83. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  84. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  85. GECAM detection of a short burst probably from SGR J1555.2-5402
  86. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  87. GECAM observation of a burst from SGR J1555.2-5402
  88. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  89. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  90. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  91. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  92. Konus-Wind observation of the recent SGR 1935+2154 activity
  93. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  94. AGILE observations of two bright bursts from SGR 1935+2154
  95. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  96. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  97. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  98. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  99. IPN triangulation of a bright burst from SGR 1935+2154
  100. GECAM observations of a series of bursts from SGR J1935+2154

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