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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"

601 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  2. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  3. GECAM-A detection of a bright burst from SGR 1E1841-045
  4. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  5. IPN triangulation of a bright burst from SGR 1E1841-045
  6. GRB 250116A: GECAM-B detection of a long burst
  7. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  8. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  9. SVOM/GRM detection of a short burst from SGR 1830
  10. GECAM detection of a short burst from SGR 1830
  11. SVOM/GRM detection of a short burst from SGR 1E1841-045
  12. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  13. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  14. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  15. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  16. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  17. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  18. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  19. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  20. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  21. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  22. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  23. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  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. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  55. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  56. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  57. GRB 220211A: redshift lower limit estimating
  58. Fermi GBM trigger 666393834/220212892 is not a GRB
  59. GECAM observations of a series of bursts from SGR J1935+2154
  60. AGILE observations of a bright burst from SGR 1935+2154
  61. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  62. IPN triangulation of a bright burst from SGR 1935+2154
  63. Konus-Wind observation of the recent SGR 1935+2154 activity
  64. GECAM observations of a series of bursts from SGR J1935+2154
  65. GECAM observations of a series of bursts from SGR J1935+2154
  66. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  67. AGILE observations of a burst from SGR 1935+2154
  68. GECAM observations of a series of bursts from SGR J1935+2154
  69. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  70. GECAM observations of a series of bursts from SGR J1935+2154
  71. GECAM observation of a burst from SGR J1555.2-5402
  72. GECAM detection of a short burst from SGR 1935+2154
  73. GECAM observations of a series of bursts from SGR J1935+2154
  74. GRB 211229A: GECAM detection
  75. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  76. AGILE observations of a bright burst from SGR 1935+2154
  77. GECAM detection of a short burst probably from SGR J1555.2-5402
  78. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  79. GECAM observation of a burst from SGR J1555.2-5402
  80. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  81. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  82. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  83. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  84. Konus-Wind observation of the recent SGR 1935+2154 activity
  85. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  86. AGILE observations of two bright bursts from SGR 1935+2154
  87. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  88. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  89. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  90. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  91. IPN triangulation of a bright burst from SGR 1935+2154
  92. GECAM observations of a series of bursts from SGR J1935+2154
  93. Swift detection of a burst from SGR Swift J1555.2-5402
  94. GECAM observation of a burst from SGR J1935+2154
  95. GECAM observation of a burst from SGR J1935+2154
  96. GECAM observation of a burst from SGR J1555.2-5402
  97. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  98. Fermi GBM observation of a burst from SGR J1555.2-5402
  99. POLAR detection of a SGR-like burst
  100. Swift detection of an outburst from SGR Swift J1555.2-5402

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