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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"

879 results found.

  1. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  2. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  3. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  4. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  5. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  6. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  7. SGR 1935+2154: AstroSat CZTI Detections
  8. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  9. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  10. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  11. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  12. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  13. SGR 1935+2154: Detection by GRBAlpha
  14. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  15. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  16. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  17. Konus-Wind observation of the recent SGR 1935+2154 activity
  18. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  19. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  20. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  21. INTEGRAL shows increasing activity in SGR J1935+2154
  22. INTEGRAL detection of a burst from SGR J1935+2154
  23. INTEGRAL detection of a burst from SGR J1935+2154
  24. Fermi GBM trigger 686350260/221001869 is not a GRB
  25. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  26. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  27. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  28. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  29. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  30. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  31. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  32. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  33. GRB 220518A: Swift/UVOT Detection
  34. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  35. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  36. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  37. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  38. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  39. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  40. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  41. GRB 220228A: Fermi-LAT detection
  42. GRB 220101A: The first example of a Petanova
  43. GRB 220211A: redshift lower limit estimating
  44. Fermi GBM trigger 666393834/220212892 is not a GRB
  45. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  46. GECAM observations of a series of bursts from SGR J1935+2154
  47. AGILE observations of a bright burst from SGR 1935+2154
  48. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  49. IPN triangulation of a bright burst from SGR 1935+2154
  50. Konus-Wind observation of the recent SGR 1935+2154 activity
  51. GECAM observations of a series of bursts from SGR J1935+2154
  52. GECAM observations of a series of bursts from SGR J1935+2154
  53. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  54. AGILE observations of a burst from SGR 1935+2154
  55. GECAM observations of a series of bursts from SGR J1935+2154
  56. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  57. GECAM observations of a series of bursts from SGR J1935+2154
  58. GECAM observation of a burst from SGR J1555.2-5402
  59. GECAM detection of a short burst from SGR 1935+2154
  60. GECAM observations of a series of bursts from SGR J1935+2154
  61. GRB 211229A: GECAM detection
  62. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  63. AGILE observations of a bright burst from SGR 1935+2154
  64. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  65. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  66. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  67. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  68. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  69. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  70. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  71. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  72. GECAM detection of a short burst probably from SGR J1555.2-5402
  73. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  74. GECAM observation of a burst from SGR J1555.2-5402
  75. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  76. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  77. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  78. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  79. Konus-Wind observation of the recent SGR 1935+2154 activity
  80. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  81. AGILE observations of two bright bursts from SGR 1935+2154
  82. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  83. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  84. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  85. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  86. IPN triangulation of a bright burst from SGR 1935+2154
  87. GECAM observations of a series of bursts from SGR J1935+2154
  88. Swift detection of a burst from SGR Swift J1555.2-5402
  89. GECAM observation of a burst from SGR J1935+2154
  90. GECAM observation of a burst from SGR J1935+2154
  91. GECAM observation of a burst from SGR J1555.2-5402
  92. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  93. Fermi GBM observation of a burst from SGR J1555.2-5402
  94. POLAR detection of a SGR-like burst
  95. Swift detection of an outburst from SGR Swift J1555.2-5402
  96. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  97. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  98. IPN Triangulation of a bright burst from SGR 1935+2154
  99. IceCube-210730A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  100. IceCube-210717A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation

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