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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"
body:"GRB"
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620 results found.

  1. GRB 260802A / EP J223759.5+531421: SVOM/VT optical upper limit
  2. Konus-Wind detection of a burst from SGR 1E1841-045 on 2026 May 2
  3. SVOM/GRM observation of a bright burst from SGR 1E1841-045
  4. IPN triangulation of a bright burst from SGR 1E1841-045
  5. GRB 251219A: GECAM-B detection of a possible magnetar X-ray burst from SGR 1830-0645
  6. GRB 250815A: Fermi GBM Final Localization
  7. The EP-WXT trigger 01709198251 is likely a flaring star
  8. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  9. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  10. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  11. Fermi GRB 250312B: Global MASTER-Net observations report
  12. GECAM-A detection of a bright burst from SGR 1E1841-045
  13. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  14. IPN triangulation of a bright burst from SGR 1E1841-045
  15. GRB 250116A: GECAM-B detection of a long burst
  16. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  17. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  18. SVOM/GRM detection of a short burst from SGR 1830
  19. GECAM detection of a short burst from SGR 1830
  20. SVOM/GRM detection of a short burst from SGR 1E1841-045
  21. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  22. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  23. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  24. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  25. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  26. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  27. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  28. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  29. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  30. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  31. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  32. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  33. GRB 240529A: Swift/UVOT Detection
  34. GRB 240225B: AstroSat CZTI detection
  35. IPN triangulation of GRB 240112A (long)
  36. GRB 240112A: GECAM detection of a burst
  37. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  38. GECAM-B observation of a short burst from SGR J1555-5402
  39. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  40. GRB 230919A: Fermi GBM Observation
  41. SGR 1806-20: Correction to GCN 33494
  42. INTEGRAL detection of a burst from SGR 1806-200
  43. VZLUSAT-2 detection of SGR 1806-20
  44. Trigger 1159327: Swift detection of SGR1806-20
  45. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  46. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  47. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  48. SGR 1935+2154: AstroSat CZTI Detections
  49. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  50. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  51. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  52. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  53. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  54. SGR 1935+2154: Detection by GRBAlpha
  55. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  56. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  57. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  58. Konus-Wind observation of the recent SGR 1935+2154 activity
  59. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  60. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  61. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  62. INTEGRAL shows increasing activity in SGR J1935+2154
  63. INTEGRAL detection of a burst from SGR J1935+2154
  64. INTEGRAL detection of a burst from SGR J1935+2154
  65. Fermi GBM trigger 686350260/221001869 is not a GRB
  66. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  67. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  68. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  69. GRB 220211A: redshift lower limit estimating
  70. Fermi GBM trigger 666393834/220212892 is not a GRB
  71. GECAM observations of a series of bursts from SGR J1935+2154
  72. AGILE observations of a bright burst from SGR 1935+2154
  73. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  74. IPN triangulation of a bright burst from SGR 1935+2154
  75. Konus-Wind observation of the recent SGR 1935+2154 activity
  76. GECAM observations of a series of bursts from SGR J1935+2154
  77. GECAM observations of a series of bursts from SGR J1935+2154
  78. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  79. AGILE observations of a burst from SGR 1935+2154
  80. GECAM observations of a series of bursts from SGR J1935+2154
  81. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  82. GECAM observations of a series of bursts from SGR J1935+2154
  83. GECAM observation of a burst from SGR J1555.2-5402
  84. GECAM detection of a short burst from SGR 1935+2154
  85. GECAM observations of a series of bursts from SGR J1935+2154
  86. GRB 211229A: GECAM detection
  87. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  88. AGILE observations of a bright burst from SGR 1935+2154
  89. GECAM detection of a short burst probably from SGR J1555.2-5402
  90. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  91. GECAM observation of a burst from SGR J1555.2-5402
  92. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  93. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  94. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  95. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  96. Konus-Wind observation of the recent SGR 1935+2154 activity
  97. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  98. AGILE observations of two bright bursts from SGR 1935+2154
  99. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  100. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)

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