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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"
submitter:"Judith Racusin"

675 results found.

  1. Konus-Wind detection of a burst from SGR 1E1841-045 on 2026 May 2
  2. SVOM/GRM observation of a bright burst from SGR 1E1841-045
  3. IPN triangulation of a bright burst from SGR 1E1841-045
  4. GRB 251219A: GECAM-B detection of a possible magnetar X-ray burst from SGR 1830-0645
  5. GRB 251129A/EP251129a : SVOM/ECLAIRs refined analysis
  6. GRB 251013C: MarSEC, optical afterglow photometry
  7. GRB 250823A: Swift detection of a burst
  8. GRB 250815A: Fermi GBM Final Localization
  9. The EP-WXT trigger 01709198251 is likely a flaring star
  10. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  11. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  12. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  13. Fermi GRB 250509A: Global MASTER-Net observations report
  14. GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  15. GECAM-A detection of a bright burst from SGR 1E1841-045
  16. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  17. IPN triangulation of a bright burst from SGR 1E1841-045
  18. GRB 250116A: GECAM-B detection of a long burst
  19. EP241217a: Gemini-North spectroscopic redshift z = 4.59
  20. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  21. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  22. SVOM/GRM detection of a short burst from SGR 1830
  23. GECAM detection of a short burst from SGR 1830
  24. SVOM/GRM detection of a short burst from SGR 1E1841-045
  25. GRB 241026A: LBT redshift confirmation
  26. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  27. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  28. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  29. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  30. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  31. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  32. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  33. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  34. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  35. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  36. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  37. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  38. Fermi trigger No 745871958: Global MASTER-Net observations report
  39. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  40. X-ray transient EP240315a: orphan FXT?
  41. Einstein Probe detected of a fast X-ray transient EP240315a
  42. IPN triangulation of GRB 240112A (long)
  43. GRB 240112A: GECAM detection of a burst
  44. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  45. GECAM-B observation of a short burst from SGR J1555-5402
  46. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  47. SGR 1806-20: Correction to GCN 33494
  48. INTEGRAL detection of a burst from SGR 1806-200
  49. VZLUSAT-2 detection of SGR 1806-20
  50. Trigger 1159327: Swift detection of SGR1806-20
  51. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  52. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  53. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  54. SGR 1935+2154: AstroSat CZTI Detections
  55. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  56. GRB 221023A: Fermi-LAT detection
  57. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  58. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  59. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  60. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  61. SGR 1935+2154: Detection by GRBAlpha
  62. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  63. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  64. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  65. Konus-Wind observation of the recent SGR 1935+2154 activity
  66. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  67. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  68. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  69. INTEGRAL shows increasing activity in SGR J1935+2154
  70. INTEGRAL detection of a burst from SGR J1935+2154
  71. INTEGRAL detection of a burst from SGR J1935+2154
  72. Swift J1913.1+1946: Optical photometry
  73. Fermi GBM trigger 686350260/221001869 is not a GRB
  74. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  75. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  76. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  77. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  78. GRB 220211A: redshift lower limit estimating
  79. Fermi GBM trigger 666393834/220212892 is not a GRB
  80. GECAM observations of a series of bursts from SGR J1935+2154
  81. AGILE observations of a bright burst from SGR 1935+2154
  82. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  83. IPN triangulation of a bright burst from SGR 1935+2154
  84. Konus-Wind observation of the recent SGR 1935+2154 activity
  85. GECAM observations of a series of bursts from SGR J1935+2154
  86. GECAM observations of a series of bursts from SGR J1935+2154
  87. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  88. AGILE observations of a burst from SGR 1935+2154
  89. GECAM observations of a series of bursts from SGR J1935+2154
  90. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  91. GECAM observations of a series of bursts from SGR J1935+2154
  92. GECAM observation of a burst from SGR J1555.2-5402
  93. GECAM detection of a short burst from SGR 1935+2154
  94. GECAM observations of a series of bursts from SGR J1935+2154
  95. GRB 211229A: GECAM detection
  96. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  97. AGILE observations of a bright burst from SGR 1935+2154
  98. GECAM detection of a short burst probably from SGR J1555.2-5402
  99. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  100. GECAM observation of a burst from SGR J1555.2-5402

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