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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').

578 results found.

  1. IPN triangulation of GRB 240112A (long)
  2. GRB 240112A: GECAM detection of a burst
  3. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  4. GECAM-B observation of a short burst from SGR J1555-5402
  5. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  6. SGR 1806-20: Correction to GCN 33494
  7. INTEGRAL detection of a burst from SGR 1806-200
  8. VZLUSAT-2 detection of SGR 1806-20
  9. Trigger 1159327: Swift detection of SGR1806-20
  10. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  11. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  12. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  13. SGR 1935+2154: AstroSat CZTI Detections
  14. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  15. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  16. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  17. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  18. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  19. SGR 1935+2154: Detection by GRBAlpha
  20. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  21. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  22. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  23. Konus-Wind observation of the recent SGR 1935+2154 activity
  24. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  25. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  26. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  27. INTEGRAL shows increasing activity in SGR J1935+2154
  28. INTEGRAL detection of a burst from SGR J1935+2154
  29. INTEGRAL detection of a burst from SGR J1935+2154
  30. Fermi GBM trigger 686350260/221001869 is not a GRB
  31. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  32. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  33. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  34. GRB 220211A: redshift lower limit estimating
  35. Fermi GBM trigger 666393834/220212892 is not a GRB
  36. GECAM observations of a series of bursts from SGR J1935+2154
  37. AGILE observations of a bright burst from SGR 1935+2154
  38. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  39. IPN triangulation of a bright burst from SGR 1935+2154
  40. Konus-Wind observation of the recent SGR 1935+2154 activity
  41. GECAM observations of a series of bursts from SGR J1935+2154
  42. GECAM observations of a series of bursts from SGR J1935+2154
  43. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  44. AGILE observations of a burst from SGR 1935+2154
  45. GECAM observations of a series of bursts from SGR J1935+2154
  46. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  47. GECAM observations of a series of bursts from SGR J1935+2154
  48. GECAM observation of a burst from SGR J1555.2-5402
  49. GECAM detection of a short burst from SGR 1935+2154
  50. GECAM observations of a series of bursts from SGR J1935+2154
  51. GRB 211229A: GECAM detection
  52. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  53. AGILE observations of a bright burst from SGR 1935+2154
  54. GECAM detection of a short burst probably from SGR J1555.2-5402
  55. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  56. GECAM observation of a burst from SGR J1555.2-5402
  57. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  58. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  59. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  60. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  61. Konus-Wind observation of the recent SGR 1935+2154 activity
  62. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  63. AGILE observations of two bright bursts from SGR 1935+2154
  64. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  65. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  66. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  67. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  68. IPN triangulation of a bright burst from SGR 1935+2154
  69. GECAM observations of a series of bursts from SGR J1935+2154
  70. Swift detection of a burst from SGR Swift J1555.2-5402
  71. GECAM observation of a burst from SGR J1935+2154
  72. GECAM observation of a burst from SGR J1935+2154
  73. GECAM observation of a burst from SGR J1555.2-5402
  74. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  75. Fermi GBM observation of a burst from SGR J1555.2-5402
  76. POLAR detection of a SGR-like burst
  77. Swift detection of an outburst from SGR Swift J1555.2-5402
  78. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  79. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  80. IPN Triangulation of a bright burst from SGR 1935+2154
  81. GECAM detection of a short burst from SGR J1935+2154
  82. Recent activity of SGR 1935+2154 as observed by CGBM
  83. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  84. GECAM detection of a short burst from SGR J1935+2154
  85. GECAM detection of a short burst from SGR J1935+2154
  86. GECAM detection of a short burst from SGR 1935+2154
  87. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  88. GECAM detection of a short burst from SGR 1935+2154
  89. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  90. Fermi GBM Observations of SGR J1935+2154
  91. Swift-BAT detection of a burst from SGR 1935+2154
  92. GECAM detection of a bright short burst from SGR 1935+2154
  93. INTEGRAL detection of a burst from SGR 1935+2154
  94. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  95. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  96. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  97. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  98. SGR J1555.2-5402: Swift-BAT refined analysis
  99. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  100. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402

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