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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.

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

600 results found.

  1. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  2. IPN Triangulation of a bright burst from SGR 1935+2154
  3. GECAM detection of a short burst from SGR J1935+2154
  4. Recent activity of SGR 1935+2154 as observed by CGBM
  5. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  6. GECAM detection of a short burst from SGR J1935+2154
  7. GECAM detection of a short burst from SGR J1935+2154
  8. GECAM detection of a short burst from SGR 1935+2154
  9. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  10. GECAM detection of a short burst from SGR 1935+2154
  11. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  12. Fermi GBM Observations of SGR J1935+2154
  13. Swift-BAT detection of a burst from SGR 1935+2154
  14. GECAM detection of a bright short burst from SGR 1935+2154
  15. INTEGRAL detection of a burst from SGR 1935+2154
  16. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  17. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  18. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  19. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  20. SGR J1555.2-5402: Swift-BAT refined analysis
  21. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  22. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  23. Swift Detection of probable new Swift SGR J1555.2-5402
  24. Fermi GBM observation of a bright burst from magneta
  25. Fermi/GBM observation of a burst from SGR 1830-0645
  26. Swift Trigger 1033144: Detection of SGR 1830-0645
  27. Swift Trigger 1032350: Detection of SGR 1830-0645
  28. SGR 1935+2154: MAXI/GSC detection
  29. Fermi GBM Observations of a bright burst from SGR J1935+2154
  30. Recent activity of SGR 1935+2154 as observed by CGBM
  31. INTEGRAL detection of a short burst from SGR 1935+2154
  32. GECAM observations of SGR 1935+2154
  33. Fermi GBM Observations of SGR J1935+2154
  34. Konus-Wind detection of two bright bursts from SGR 1935+2154
  35. IPN triangulation of a bright burst from SGR 1935+2154
  36. GECAM detection of a short burst probably from SGR 1935+2154
  37. IPN triangulation of GRB 210124B (short)
  38. GRB 210119A (Swift J1851.2-6148): Swift-BAT refined analysis
  39. GECAM detection of a short GRB 210119A or a new SGR candidate Swift J1851.2-6148
  40. GRB 210119A: Fermi GBM observation
  41. Short Fermi GRB 210119A or new SGR Swift J1851.2-6148: Possible MASTER Short OT detection
  42. Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
  43. GRB 201227A: continued Chilescope confirmation of variability of possible optical counterpart, redshift estimating
  44. Swift Trigger 1005428: Detection of SGR 1830-0645
  45. Swift Trigger 1004219: Detection of SGR 1830-0645
  46. SGR 1830-0645: Swift/UVOT Upper Limits
  47. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  48. Fermi trigger No 624139481: AGILE detection
  49. SGR 1830-0645: pre-discovery detection in Swift/BAT
  50. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  51. SGR 1830-0645: Swift-BAT refined analysis
  52. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  53. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  54. AX J1846.4-0258: Swift-BAT refined analysis
  55. Swift Detection of an SGR-like flare from AX J1846.4-0258
  56. Fermi GBM trigger 616776657/200718619 is not a GRB
  57. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  58. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  59. 1RXS J1708−4009: Swift-BAT refined analysis
  60. Swift detection of an SGR-like burst from 1RXS J1708−4009
  61. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  62. Swift Detection of a burst from SGR Swift J1818.0-1607
  63. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  64. SGR 1935+2154: AstroSat CZTI detection
  65. Insight-HXMT's continued observation plan for SGR J1935+2154
  66. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  67. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  68. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  69. Swift Detection of a burst from SGR Swift J1818.0-1607
  70. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  71. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  72. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  73. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  74. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  75. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  76. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  77. Trigger 968731: Swift detection of SGR1806-20
  78. Fermi GBM trigger 200429866/609886052 is not a GRB
  79. SGR 1935+2154: MASTER optical observations
  80. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  81. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  82. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  83. A Forest of Bursts from SGR 1935+2154
  84. SGR 1935+2154: AstroSat CZTI detections
  85. high bursting activity of SGR 1935+2154: CGBM observations
  86. SGR 1935+2154 the Insight-HXMT observation plan
  87. SGR 1935+2154: MAXI/GSC detection
  88. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  89. Swift detection of multiple bursts from SGR 1935+2154
  90. Konus-Wind observation of a bright burst from SGR 1935+2154
  91. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  92. IPN Triangulation of a bright burst from SGR 1935+2154
  93. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  94. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  95. Konus-Wind observation of a bright burst from SGR 1935+2154
  96. SGR 1935+2154: Fermi GBM observation
  97. IPN Triangulation of a bright burst from SGR 1935+2154
  98. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  99. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  100. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607

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