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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 from magnetar SGR 1935+2154
  2. Swift detection of multiple bursts from SGR 1935+2154
  3. Konus-Wind observation of a bright burst from SGR 1935+2154
  4. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  5. IPN Triangulation of a bright burst from SGR 1935+2154
  6. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  7. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  8. Konus-Wind observation of a bright burst from SGR 1935+2154
  9. SGR 1935+2154: Fermi GBM observation
  10. IPN Triangulation of a bright burst from SGR 1935+2154
  11. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  12. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  13. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  14. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  15. GRB 200131A: Swift/UVOT Detection
  16. Konus-Wind observation of the recent SGR 1935+2154 activity
  17. Swift trigger 933276 MASTER observation
  18. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  19. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  20. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  21. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  22. SGR 1935+2154: Swift-BAT refined analysis
  23. GRB 191104B/GRB 191104C are SGR 1935+2154
  24. Trigger 933083: Swift detection of SGR 1935+2154
  25. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  26. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  27. Swift GRB190624.86 Global MASTER-Net observations report
  28. GRB 190326A: Swift XRT and UVOT follow-up observations
  29. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  30. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  31. GRB 180721A: Swift/UVOT Upper Limits
  32. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  33. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  34. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  35. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  36. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  37. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  38. GRB 170524A: Swift detection of a burst (or possible new SGR)
  39. GRB 161014A: Swift/UVOT Detection
  40. GRB 161007A: Swift/UVOT Upper Limits
  41. GRB 160821B: Swift-BAT refined analysis
  42. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  43. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  44. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  45. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  46. Konus-Wind observation of a bright burst from SGR 1935+2154
  47. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  48. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  49. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  50. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  51. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  52. Trigger 701182: Swift detection of SGR 1935+2154
  53. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  54. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  55. Fermi GBM Trigger 160622573 is not a GRB
  56. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  57. More FERMI GBM bursts from the magnetar SGR 1935+2154
  58. SGR 1935+2154: MAXI/GSC detection
  59. Fermi GBM trigger 488128598/160620637 is not a GRB
  60. Fermi GBM trigger 487974449/160618852 is not a GRB
  61. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  62. Trigger 689353: Swift detection of a transient near Sgr A*
  63. Fermi GBM trigger 486562774/160602514 is not a GRB
  64. Another Swift detection of SGR 1935+2154 (trigger #687124)
  65. Swift detection of SGR 1935+2154
  66. Konus-Wind observation of a bright burst from SGR 1935+2154
  67. FERMI GBM bursts from the magnetar SGR 1935+2154
  68. SGR 1935+2154: AbAO optical upper limit
  69. Fermi GBM triggers of SGR 1935+2154
  70. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  71. Fermi GBM trigger 485124591/160516868 is not a GRB
  72. Trigger 686443: Swift detection of SGR 1935+2154
  73. Fermi GBM trigger 484906918/160514349 is not a GRB
  74. SGR 0755-2933, Swift-BAT refined analysis
  75. Swift detection of a likely new SGR: SGR 0755-2933
  76. IBAS Alert 7313 is SGR J1935+2154
  77. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  78. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  79. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  80. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  81. Trigger 649113: Swift detection of SGR 1E 1841-045
  82. Swift-XRT observations of GRB 150710A
  83. Konus-Wind observation of a bright burst from SGR 1935+2154
  84. IPN Triangulation of a bright burst from SGR 1935+2154
  85. GRB 150301A: Swift-BAT refined analysis
  86. GRB 150301A: Fermi GBM observation
  87. GRB 150301A: Swift detection of a short burst or new SGR
  88. Fermi GBM Observations of SGR 1935+2154
  89. Fermi GBM trigger 150223068 is not a GRB
  90. SGR 1935+2154: Swift-BAT refined analysis
  91. Swift detection of an outburst from SGR 1935+2154
  92. Trigger 607399: Swift detection of SGR1806-20
  93. Fermi GBM Observations of SGR 1935+2154
  94. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  95. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  96. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  97. SGR 1935+2154: Swift-BAT observations of additional short soft events
  98. GRB 140705A / SGR 1935+2154: FTN observations
  99. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  100. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154

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