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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"

600 results found.

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

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