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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').
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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.

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subject:"Swift"
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608 results found.

  1. GECAM-A detection of a bright burst from SGR 1E1841-045
  2. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  3. IPN triangulation of a bright burst from SGR 1E1841-045
  4. GRB 250116A: GECAM-B detection of a long burst
  5. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  6. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  7. SVOM/GRM detection of a short burst from SGR 1830
  8. GECAM detection of a short burst from SGR 1830
  9. SVOM/GRM detection of a short burst from SGR 1E1841-045
  10. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  11. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  12. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  13. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  14. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  15. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  16. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  17. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  18. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  19. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  20. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  21. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  22. LIGO/Virgo/KAGRA S240514c: Updated Sky localization
  23. GRB 240317A: AstroSat CZTI detection
  24. IPN triangulation of GRB 240112A (long)
  25. GRB 240112A: GECAM detection of a burst
  26. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  27. GECAM-B observation of a short burst from SGR J1555-5402
  28. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  29. SGR 1806-20: Correction to GCN 33494
  30. INTEGRAL detection of a burst from SGR 1806-200
  31. VZLUSAT-2 detection of SGR 1806-20
  32. Trigger 1159327: Swift detection of SGR1806-20
  33. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  34. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  35. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  36. SGR 1935+2154: AstroSat CZTI Detections
  37. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  38. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  39. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  40. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  41. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  42. SGR 1935+2154: Detection by GRBAlpha
  43. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  44. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  45. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  46. Konus-Wind observation of the recent SGR 1935+2154 activity
  47. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  48. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  49. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  50. INTEGRAL shows increasing activity in SGR J1935+2154
  51. INTEGRAL detection of a burst from SGR J1935+2154
  52. INTEGRAL detection of a burst from SGR J1935+2154
  53. Fermi GBM trigger 686350260/221001869 is not a GRB
  54. GRB 220701A: Swift/UVOT Upper Limits
  55. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  56. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  57. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  58. GRB 220211A: redshift lower limit estimating
  59. Fermi GBM trigger 666393834/220212892 is not a GRB
  60. GECAM observations of a series of bursts from SGR J1935+2154
  61. AGILE observations of a bright burst from SGR 1935+2154
  62. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  63. IPN triangulation of a bright burst from SGR 1935+2154
  64. Konus-Wind observation of the recent SGR 1935+2154 activity
  65. GECAM observations of a series of bursts from SGR J1935+2154
  66. GECAM observations of a series of bursts from SGR J1935+2154
  67. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  68. AGILE observations of a burst from SGR 1935+2154
  69. GECAM observations of a series of bursts from SGR J1935+2154
  70. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  71. GECAM observations of a series of bursts from SGR J1935+2154
  72. GECAM observation of a burst from SGR J1555.2-5402
  73. GECAM detection of a short burst from SGR 1935+2154
  74. GECAM observations of a series of bursts from SGR J1935+2154
  75. GRB 211229A: GECAM detection
  76. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  77. AGILE observations of a bright burst from SGR 1935+2154
  78. GECAM detection of a short burst probably from SGR J1555.2-5402
  79. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  80. GECAM observation of a burst from SGR J1555.2-5402
  81. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  82. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  83. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  84. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  85. Konus-Wind observation of the recent SGR 1935+2154 activity
  86. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  87. AGILE observations of two bright bursts from SGR 1935+2154
  88. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  89. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  90. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  91. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  92. IPN triangulation of a bright burst from SGR 1935+2154
  93. GECAM observations of a series of bursts from SGR J1935+2154
  94. Swift detection of a burst from SGR Swift J1555.2-5402
  95. GECAM observation of a burst from SGR J1935+2154
  96. GECAM observation of a burst from SGR J1935+2154
  97. GECAM observation of a burst from SGR J1555.2-5402
  98. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  99. Fermi GBM observation of a burst from SGR J1555.2-5402
  100. POLAR detection of a SGR-like burst

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