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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').

581 results found.

  1. IPN triangulation of GRB 240112A (long)
  2. GRB 240112A: GECAM detection of a burst
  3. LIGO/Virgo/KAGRA S231129ac: Identification of a GW compact binary merger candidate
  4. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  5. GECAM-B observation of a short burst from SGR J1555-5402
  6. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  7. SGR 1806-20: Correction to GCN 33494
  8. INTEGRAL detection of a burst from SGR 1806-200
  9. VZLUSAT-2 detection of SGR 1806-20
  10. Trigger 1159327: Swift detection of SGR1806-20
  11. GRB 230204B: Swift/UVOT Upper Limits
  12. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  13. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  14. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  15. SGR 1935+2154: AstroSat CZTI Detections
  16. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  17. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  18. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  19. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  20. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  21. SGR 1935+2154: Detection by GRBAlpha
  22. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  23. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  24. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  25. Konus-Wind observation of the recent SGR 1935+2154 activity
  26. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  27. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  28. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  29. INTEGRAL shows increasing activity in SGR J1935+2154
  30. INTEGRAL detection of a burst from SGR J1935+2154
  31. INTEGRAL detection of a burst from SGR J1935+2154
  32. Fermi GBM trigger 686350260/221001869 is not a GRB
  33. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  34. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  35. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  36. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  37. GRB 220514A: AstroSat CZTI detection
  38. GRB 220211A: redshift lower limit estimating
  39. Fermi GBM trigger 666393834/220212892 is not a GRB
  40. GECAM observations of a series of bursts from SGR J1935+2154
  41. AGILE observations of a bright burst from SGR 1935+2154
  42. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  43. IPN triangulation of a bright burst from SGR 1935+2154
  44. Konus-Wind observation of the recent SGR 1935+2154 activity
  45. GECAM observations of a series of bursts from SGR J1935+2154
  46. GECAM observations of a series of bursts from SGR J1935+2154
  47. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  48. AGILE observations of a burst from SGR 1935+2154
  49. GECAM observations of a series of bursts from SGR J1935+2154
  50. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  51. GECAM observations of a series of bursts from SGR J1935+2154
  52. GECAM observation of a burst from SGR J1555.2-5402
  53. GECAM detection of a short burst from SGR 1935+2154
  54. GECAM observations of a series of bursts from SGR J1935+2154
  55. GRB 211229A: GECAM detection
  56. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  57. AGILE observations of a bright burst from SGR 1935+2154
  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. GECAM detection of a short burst from SGR J1935+2154
  86. Recent activity of SGR 1935+2154 as observed by CGBM
  87. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  88. GECAM detection of a short burst from SGR J1935+2154
  89. GECAM detection of a short burst from SGR J1935+2154
  90. GECAM detection of a short burst from SGR 1935+2154
  91. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  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 6
  94. Fermi GBM Observations of SGR J1935+2154
  95. Swift-BAT detection of a burst from SGR 1935+2154
  96. GECAM detection of a bright short burst from SGR 1935+2154
  97. INTEGRAL detection of a burst from SGR 1935+2154
  98. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  99. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  100. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402

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