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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"

611 results found.

  1. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  2. IPN triangulation of a bright burst from SGR 1935+2154
  3. GECAM observations of a series of bursts from SGR J1935+2154
  4. Swift detection of a burst from SGR Swift J1555.2-5402
  5. GECAM observation of a burst from SGR J1935+2154
  6. GECAM observation of a burst from SGR J1935+2154
  7. GECAM observation of a burst from SGR J1555.2-5402
  8. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  9. Fermi GBM observation of a burst from SGR J1555.2-5402
  10. POLAR detection of a SGR-like burst
  11. Swift detection of an outburst from SGR Swift J1555.2-5402
  12. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  13. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  14. IPN Triangulation of a bright burst from SGR 1935+2154
  15. GECAM detection of a short burst from SGR J1935+2154
  16. Recent activity of SGR 1935+2154 as observed by CGBM
  17. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  18. GECAM detection of a short burst from SGR J1935+2154
  19. GECAM detection of a short burst from SGR J1935+2154
  20. GECAM detection of a short burst from SGR 1935+2154
  21. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  22. GECAM detection of a short burst from SGR 1935+2154
  23. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  24. Fermi GBM Observations of SGR J1935+2154
  25. Swift-BAT detection of a burst from SGR 1935+2154
  26. GECAM detection of a bright short burst from SGR 1935+2154
  27. INTEGRAL detection of a burst from SGR 1935+2154
  28. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  29. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  30. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  31. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  32. SGR J1555.2-5402: Swift-BAT refined analysis
  33. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  34. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  35. Swift Detection of probable new Swift SGR J1555.2-5402
  36. Fermi GBM observation of a bright burst from magneta
  37. Fermi/GBM observation of a burst from SGR 1830-0645
  38. Swift Trigger 1033144: Detection of SGR 1830-0645
  39. Swift Trigger 1032350: Detection of SGR 1830-0645
  40. SGR 1935+2154: MAXI/GSC detection
  41. Fermi GBM Observations of a bright burst from SGR J1935+2154
  42. Recent activity of SGR 1935+2154 as observed by CGBM
  43. INTEGRAL detection of a short burst from SGR 1935+2154
  44. GECAM observations of SGR 1935+2154
  45. Fermi GBM Observations of SGR J1935+2154
  46. Konus-Wind detection of two bright bursts from SGR 1935+2154
  47. IPN triangulation of a bright burst from SGR 1935+2154
  48. GECAM detection of a short burst probably from SGR 1935+2154
  49. IPN triangulation of GRB 210124B (short)
  50. GRB 210119A (Swift J1851.2-6148): Swift-BAT refined analysis
  51. GECAM detection of a short GRB 210119A or a new SGR candidate Swift J1851.2-6148
  52. GRB 210119A: Fermi GBM observation
  53. Short Fermi GRB 210119A or new SGR Swift J1851.2-6148: Possible MASTER Short OT detection
  54. Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
  55. GRB 201227A: continued Chilescope confirmation of variability of possible optical counterpart, redshift estimating
  56. Swift Trigger 1005428: Detection of SGR 1830-0645
  57. Swift Trigger 1004219: Detection of SGR 1830-0645
  58. SGR 1830-0645: Swift/UVOT Upper Limits
  59. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  60. Fermi trigger No 624139481: AGILE detection
  61. SGR 1830-0645: pre-discovery detection in Swift/BAT
  62. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  63. SGR 1830-0645: Swift-BAT refined analysis
  64. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  65. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  66. AX J1846.4-0258: Swift-BAT refined analysis
  67. Swift Detection of an SGR-like flare from AX J1846.4-0258
  68. Fermi GBM trigger 616776657/200718619 is not a GRB
  69. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  70. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  71. 1RXS J1708−4009: Swift-BAT refined analysis
  72. Swift detection of an SGR-like burst from 1RXS J1708−4009
  73. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  74. Swift Detection of a burst from SGR Swift J1818.0-1607
  75. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  76. SGR 1935+2154: AstroSat CZTI detection
  77. Insight-HXMT's continued observation plan for SGR J1935+2154
  78. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  79. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  80. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  81. Swift Detection of a burst from SGR Swift J1818.0-1607
  82. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  83. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  84. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  85. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  86. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  87. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  88. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  89. Trigger 968731: Swift detection of SGR1806-20
  90. Fermi GBM trigger 200429866/609886052 is not a GRB
  91. SGR 1935+2154: MASTER optical observations
  92. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  93. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  94. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  95. A Forest of Bursts from SGR 1935+2154
  96. SGR 1935+2154: AstroSat CZTI detections
  97. high bursting activity of SGR 1935+2154: CGBM observations
  98. SGR 1935+2154 the Insight-HXMT observation plan
  99. SGR 1935+2154: MAXI/GSC detection
  100. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154

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