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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"

620 results found.

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

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