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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').
Advanced Search

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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

606 results found.

  1. GRB 250815A: Fermi GBM Final Localization
  2. The EP-WXT trigger 01709198251 is likely a flaring star
  3. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  4. Fermi GRB 250716A: Global MASTER-Net observations report
  5. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  6. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  7. GECAM-A detection of a bright burst from SGR 1E1841-045
  8. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  9. IPN triangulation of a bright burst from SGR 1E1841-045
  10. GRB 250116A: GECAM-B detection of a long burst
  11. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  12. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  13. SVOM/GRM detection of a short burst from SGR 1830
  14. GECAM detection of a short burst from SGR 1830
  15. SVOM/GRM detection of a short burst from SGR 1E1841-045
  16. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  17. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  18. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  19. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  20. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  21. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  22. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  23. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  24. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  25. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  26. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  27. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  28. IPN triangulation of GRB 240112A (long)
  29. GRB 240112A: GECAM detection of a burst
  30. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  31. GECAM-B observation of a short burst from SGR J1555-5402
  32. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  33. SGR 1806-20: Correction to GCN 33494
  34. INTEGRAL detection of a burst from SGR 1806-200
  35. VZLUSAT-2 detection of SGR 1806-20
  36. Trigger 1159327: Swift detection of SGR1806-20
  37. GRB 230228A: Swift/UVOT Upper Limits
  38. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  39. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  40. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  41. SGR 1935+2154: AstroSat CZTI Detections
  42. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  43. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  44. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  45. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  46. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  47. SGR 1935+2154: Detection by GRBAlpha
  48. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  49. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  50. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  51. Konus-Wind observation of the recent SGR 1935+2154 activity
  52. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  53. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  54. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  55. INTEGRAL shows increasing activity in SGR J1935+2154
  56. INTEGRAL detection of a burst from SGR J1935+2154
  57. INTEGRAL detection of a burst from SGR J1935+2154
  58. Fermi GBM trigger 686350260/221001869 is not a GRB
  59. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  60. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  61. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  62. GRB 220211A: redshift lower limit estimating
  63. Fermi GBM trigger 666393834/220212892 is not a GRB
  64. GECAM observations of a series of bursts from SGR J1935+2154
  65. AGILE observations of a bright burst from SGR 1935+2154
  66. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  67. IPN triangulation of a bright burst from SGR 1935+2154
  68. Konus-Wind observation of the recent SGR 1935+2154 activity
  69. GECAM observations of a series of bursts from SGR J1935+2154
  70. GECAM observations of a series of bursts from SGR J1935+2154
  71. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  72. AGILE observations of a burst from SGR 1935+2154
  73. GECAM observations of a series of bursts from SGR J1935+2154
  74. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  75. GECAM observations of a series of bursts from SGR J1935+2154
  76. GECAM observation of a burst from SGR J1555.2-5402
  77. GECAM detection of a short burst from SGR 1935+2154
  78. GECAM observations of a series of bursts from SGR J1935+2154
  79. GRB 211229A: GECAM detection
  80. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  81. AGILE observations of a bright burst from SGR 1935+2154
  82. GECAM detection of a short burst probably from SGR J1555.2-5402
  83. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  84. GECAM observation of a burst from SGR J1555.2-5402
  85. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  86. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  87. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  88. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  89. Konus-Wind observation of the recent SGR 1935+2154 activity
  90. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  91. AGILE observations of two bright bursts from SGR 1935+2154
  92. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  93. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  94. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  95. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  96. IPN triangulation of a bright burst from SGR 1935+2154
  97. GECAM observations of a series of bursts from SGR J1935+2154
  98. Swift detection of a burst from SGR Swift J1555.2-5402
  99. GECAM observation of a burst from SGR J1935+2154
  100. GECAM observation of a burst from SGR J1935+2154

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