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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"

676 results found.

  1. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  2. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  3. Swift Detection of a burst from SGR Swift J1818.0-1607
  4. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  5. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  6. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  7. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  8. No optical bursts detected from SGR J1935+2154 by 24 fps observations with Tomo-e Gozen
  9. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the Fast Radio Burst from SGR 1935+2154
  10. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  11. Trigger 968731: Swift detection of SGR1806-20
  12. Fermi GBM trigger 200429866/609886052 is not a GRB
  13. SGR 1935+2154: MASTER optical observations
  14. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154
  15. SGR 1935+2154: INTEGRAL hard X-ray counterpart of radio burst
  16. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  17. A Forest of Bursts from SGR 1935+2154
  18. SGR 1935+2154: AstroSat CZTI detections
  19. high bursting activity of SGR 1935+2154: CGBM observations
  20. SGR 1935+2154 the Insight-HXMT observation plan
  21. SGR 1935+2154: MAXI/GSC detection
  22. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  23. Swift detection of multiple bursts from SGR 1935+2154
  24. Konus-Wind observation of a bright burst from SGR 1935+2154
  25. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  26. IPN Triangulation of a bright burst from SGR 1935+2154
  27. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  28. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  29. Konus-Wind observation of a bright burst from SGR 1935+2154
  30. SGR 1935+2154: Fermi GBM observation
  31. IPN Triangulation of a bright burst from SGR 1935+2154
  32. IPN triangulation of GRB 200405B (short)
  33. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  34. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  35. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  36. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  37. GRB 200109A: Swift detection of a burst
  38. Konus-Wind observation of the recent SGR 1935+2154 activity
  39. Swift trigger 933276 MASTER observation
  40. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  41. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  42. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  43. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  44. SGR 1935+2154: Swift-BAT refined analysis
  45. GRB 191104B/GRB 191104C are SGR 1935+2154
  46. Trigger 933083: Swift detection of SGR 1935+2154
  47. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  48. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  49. GRB 191001B: Swift detection of a burst
  50. LIGO/Virgo S190425z: SALT spectroscopy of ZTF19aarzaod as a likely type II supernova
  51. GRB 190326A: Swift XRT and UVOT follow-up observations
  52. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  53. Konus-Wind observation of GRB 190206A
  54. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  55. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  56. GRB 180407A: Swift detection of a burst
  57. GRB 180404B: Swift/UVOT Detection
  58. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  59. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  60. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  61. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  62. GRB 170728B: Kottamia R-band observation
  63. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  64. GRB 170524A: Swift detection of a burst (or possible new SGR)
  65. LIGO/Virgo G268556: Identification of a GW CBC Candidate
  66. GRB 160917B: Lomonosov BDRG gamma ray discovery
  67. GRB 160821B: Swift-BAT refined analysis
  68. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  69. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  70. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  71. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  72. Konus-Wind observation of a bright burst from SGR 1935+2154
  73. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  74. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  75. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  76. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  77. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  78. Trigger 701182: Swift detection of SGR 1935+2154
  79. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  80. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  81. Fermi GBM Trigger 160622573 is not a GRB
  82. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  83. More FERMI GBM bursts from the magnetar SGR 1935+2154
  84. SGR 1935+2154: MAXI/GSC detection
  85. Fermi GBM trigger 488128598/160620637 is not a GRB
  86. Fermi GBM trigger 487974449/160618852 is not a GRB
  87. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  88. Trigger 689353: Swift detection of a transient near Sgr A*
  89. Fermi GBM trigger 486562774/160602514 is not a GRB
  90. Another Swift detection of SGR 1935+2154 (trigger #687124)
  91. Swift detection of SGR 1935+2154
  92. Konus-Wind observation of a bright burst from SGR 1935+2154
  93. FERMI GBM bursts from the magnetar SGR 1935+2154
  94. SGR 1935+2154: AbAO optical upper limit
  95. Fermi GBM triggers of SGR 1935+2154
  96. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  97. Fermi GBM trigger 485124591/160516868 is not a GRB
  98. Trigger 686443: Swift detection of SGR 1935+2154
  99. Fermi GBM trigger 484906918/160514349 is not a GRB
  100. SGR 0755-2933, Swift-BAT refined analysis

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