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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').
Advanced Search

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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

602 results found.

  1. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  2. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  3. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  4. GRB 200306C: Enhanced Swift-XRT position
  5. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  6. Konus-Wind observation of the recent SGR 1935+2154 activity
  7. Swift trigger 933276 MASTER observation
  8. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  9. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  10. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  11. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  12. SGR 1935+2154: Swift-BAT refined analysis
  13. GRB 191104B/GRB 191104C are SGR 1935+2154
  14. Trigger 933083: Swift detection of SGR 1935+2154
  15. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  16. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  17. GRB 190326A: Swift XRT and UVOT follow-up observations
  18. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  19. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  20. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  21. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  22. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  23. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  24. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  25. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  26. GRB 170524A: Swift detection of a burst (or possible new SGR)
  27. GRB 160821B: Swift-BAT refined analysis
  28. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  29. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  30. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  31. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  32. Konus-Wind observation of a bright burst from SGR 1935+2154
  33. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  34. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  35. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  36. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  37. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  38. Trigger 701182: Swift detection of SGR 1935+2154
  39. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  40. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  41. Fermi GBM Trigger 160622573 is not a GRB
  42. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  43. More FERMI GBM bursts from the magnetar SGR 1935+2154
  44. SGR 1935+2154: MAXI/GSC detection
  45. Fermi GBM trigger 488128598/160620637 is not a GRB
  46. Fermi GBM trigger 487974449/160618852 is not a GRB
  47. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  48. Trigger 689353: Swift detection of a transient near Sgr A*
  49. Fermi GBM trigger 486562774/160602514 is not a GRB
  50. Another Swift detection of SGR 1935+2154 (trigger #687124)
  51. Swift detection of SGR 1935+2154
  52. Konus-Wind observation of a bright burst from SGR 1935+2154
  53. FERMI GBM bursts from the magnetar SGR 1935+2154
  54. SGR 1935+2154: AbAO optical upper limit
  55. Fermi GBM triggers of SGR 1935+2154
  56. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  57. Fermi GBM trigger 485124591/160516868 is not a GRB
  58. Trigger 686443: Swift detection of SGR 1935+2154
  59. Fermi GBM trigger 484906918/160514349 is not a GRB
  60. SGR 0755-2933, Swift-BAT refined analysis
  61. Swift detection of a likely new SGR: SGR 0755-2933
  62. IBAS Alert 7313 is SGR J1935+2154
  63. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  64. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  65. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  66. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  67. Trigger 649113: Swift detection of SGR 1E 1841-045
  68. Swift-XRT observations of GRB 150710A
  69. Konus-Wind observation of a bright burst from SGR 1935+2154
  70. IPN Triangulation of a bright burst from SGR 1935+2154
  71. GRB 150301A: Swift-BAT refined analysis
  72. GRB 150301A: Fermi GBM observation
  73. GRB 150301A: Swift detection of a short burst or new SGR
  74. Fermi GBM Observations of SGR 1935+2154
  75. Fermi GBM trigger 150223068 is not a GRB
  76. SGR 1935+2154: Swift-BAT refined analysis
  77. Swift detection of an outburst from SGR 1935+2154
  78. Trigger 607399: Swift detection of SGR1806-20
  79. Fermi GBM Observations of SGR 1935+2154
  80. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  81. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  82. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  83. SGR 1935+2154: Swift-BAT observations of additional short soft events
  84. GRB 140705A / SGR 1935+2154: FTN observations
  85. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  86. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  87. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  88. Trigger 597570: Swift detection of SGR 1806-20
  89. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  90. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  91. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  92. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  93. Trigger 565443: Swift detection of a burst from SGR J1745-29
  94. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  95. Trigger 557640: Swift detection of burst from SGR J1745-29
  96. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  97. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  98. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  99. Trigger 549841: Swift detection of SGR1806-20
  100. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)

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