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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').

586 results found.

  1. GRB 240317A: AstroSat CZTI detection
  2. IPN triangulation of GRB 240112A (long)
  3. GRB 240112A: GECAM detection of a burst
  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. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  12. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  13. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  14. SGR 1935+2154: AstroSat CZTI Detections
  15. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  16. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  17. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  18. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  19. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  20. SGR 1935+2154: Detection by GRBAlpha
  21. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  22. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  23. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  24. Konus-Wind observation of the recent SGR 1935+2154 activity
  25. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  26. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  27. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  28. INTEGRAL shows increasing activity in SGR J1935+2154
  29. INTEGRAL detection of a burst from SGR J1935+2154
  30. INTEGRAL detection of a burst from SGR J1935+2154
  31. Fermi GBM trigger 686350260/221001869 is not a GRB
  32. GRB 220701A: Swift/UVOT Upper Limits
  33. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  34. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  35. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  36. GRB 220211A: redshift lower limit estimating
  37. Fermi GBM trigger 666393834/220212892 is not a GRB
  38. GECAM observations of a series of bursts from SGR J1935+2154
  39. AGILE observations of a bright burst from SGR 1935+2154
  40. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  41. IPN triangulation of a bright burst from SGR 1935+2154
  42. Konus-Wind observation of the recent SGR 1935+2154 activity
  43. GECAM observations of a series of bursts from SGR J1935+2154
  44. GECAM observations of a series of bursts from SGR J1935+2154
  45. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  46. AGILE observations of a burst from SGR 1935+2154
  47. GECAM observations of a series of bursts from SGR J1935+2154
  48. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  49. GECAM observations of a series of bursts from SGR J1935+2154
  50. GECAM observation of a burst from SGR J1555.2-5402
  51. GECAM detection of a short burst from SGR 1935+2154
  52. GECAM observations of a series of bursts from SGR J1935+2154
  53. GRB 211229A: GECAM detection
  54. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  55. AGILE observations of a bright burst from SGR 1935+2154
  56. GECAM detection of a short burst probably from SGR J1555.2-5402
  57. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  58. GECAM observation of a burst from SGR J1555.2-5402
  59. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  60. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  61. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  62. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  63. Konus-Wind observation of the recent SGR 1935+2154 activity
  64. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  65. AGILE observations of two bright bursts from SGR 1935+2154
  66. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  67. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  68. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  69. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  70. IPN triangulation of a bright burst from SGR 1935+2154
  71. GECAM observations of a series of bursts from SGR J1935+2154
  72. Swift detection of a burst from SGR Swift J1555.2-5402
  73. GECAM observation of a burst from SGR J1935+2154
  74. GECAM observation of a burst from SGR J1935+2154
  75. GECAM observation of a burst from SGR J1555.2-5402
  76. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  77. Fermi GBM observation of a burst from SGR J1555.2-5402
  78. POLAR detection of a SGR-like burst
  79. Swift detection of an outburst from SGR Swift J1555.2-5402
  80. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  81. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  82. IPN Triangulation of a bright burst from SGR 1935+2154
  83. Fermi trigger No 649814537: Global MASTER-Net observations report
  84. GECAM detection of a short burst from SGR J1935+2154
  85. Recent activity of SGR 1935+2154 as observed by CGBM
  86. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  87. GECAM detection of a short burst from SGR J1935+2154
  88. GECAM detection of a short burst from SGR J1935+2154
  89. GECAM detection of a short burst from SGR 1935+2154
  90. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  91. GECAM detection of a short burst from SGR 1935+2154
  92. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  93. Fermi GBM Observations of SGR J1935+2154
  94. Swift-BAT detection of a burst from SGR 1935+2154
  95. GECAM detection of a bright short burst from SGR 1935+2154
  96. INTEGRAL detection of a burst from SGR 1935+2154
  97. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  98. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  99. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  100. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402

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