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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"

676 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 251129A/EP251129a : SVOM/ECLAIRs refined analysis
  7. GRB 251013C: MarSEC, optical afterglow photometry
  8. GRB 250823A: Swift detection of a burst
  9. GRB 250815A: Fermi GBM Final Localization
  10. The EP-WXT trigger 01709198251 is likely a flaring star
  11. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  12. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  13. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  14. Fermi GRB 250509A: Global MASTER-Net observations report
  15. GRB 250430A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  16. GECAM-A detection of a bright burst from SGR 1E1841-045
  17. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  18. IPN triangulation of a bright burst from SGR 1E1841-045
  19. GRB 250116A: GECAM-B detection of a long burst
  20. EP241217a: Gemini-North spectroscopic redshift z = 4.59
  21. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  22. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  23. SVOM/GRM detection of a short burst from SGR 1830
  24. GECAM detection of a short burst from SGR 1830
  25. SVOM/GRM detection of a short burst from SGR 1E1841-045
  26. GRB 241026A: LBT redshift confirmation
  27. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  28. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  29. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  30. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  31. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  32. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  33. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  34. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  35. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  36. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  37. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  38. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  39. Fermi trigger No 745871958: Global MASTER-Net observations report
  40. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  41. X-ray transient EP240315a: orphan FXT?
  42. Einstein Probe detected of a fast X-ray transient EP240315a
  43. IPN triangulation of GRB 240112A (long)
  44. GRB 240112A: GECAM detection of a burst
  45. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  46. GECAM-B observation of a short burst from SGR J1555-5402
  47. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  48. SGR 1806-20: Correction to GCN 33494
  49. INTEGRAL detection of a burst from SGR 1806-200
  50. VZLUSAT-2 detection of SGR 1806-20
  51. Trigger 1159327: Swift detection of SGR1806-20
  52. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  53. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  54. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  55. SGR 1935+2154: AstroSat CZTI Detections
  56. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  57. GRB 221023A: Fermi-LAT detection
  58. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  59. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  60. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  61. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  62. SGR 1935+2154: Detection by GRBAlpha
  63. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  64. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  65. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  66. Konus-Wind observation of the recent SGR 1935+2154 activity
  67. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  68. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  69. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  70. INTEGRAL shows increasing activity in SGR J1935+2154
  71. INTEGRAL detection of a burst from SGR J1935+2154
  72. INTEGRAL detection of a burst from SGR J1935+2154
  73. Swift J1913.1+1946: Optical photometry
  74. Fermi GBM trigger 686350260/221001869 is not a GRB
  75. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  76. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  77. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  78. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  79. GRB 220211A: redshift lower limit estimating
  80. Fermi GBM trigger 666393834/220212892 is not a GRB
  81. GECAM observations of a series of bursts from SGR J1935+2154
  82. AGILE observations of a bright burst from SGR 1935+2154
  83. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  84. IPN triangulation of a bright burst from SGR 1935+2154
  85. Konus-Wind observation of the recent SGR 1935+2154 activity
  86. GECAM observations of a series of bursts from SGR J1935+2154
  87. GECAM observations of a series of bursts from SGR J1935+2154
  88. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  89. AGILE observations of a burst from SGR 1935+2154
  90. GECAM observations of a series of bursts from SGR J1935+2154
  91. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  92. GECAM observations of a series of bursts from SGR J1935+2154
  93. GECAM observation of a burst from SGR J1555.2-5402
  94. GECAM detection of a short burst from SGR 1935+2154
  95. GECAM observations of a series of bursts from SGR J1935+2154
  96. GRB 211229A: GECAM detection
  97. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  98. AGILE observations of a bright burst from SGR 1935+2154
  99. GECAM detection of a short burst probably from SGR J1555.2-5402
  100. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB

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