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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"

599 results found.

  1. Konus-Wind observation of the recent SGR 1935+2154 activity
  2. Swift trigger 933276 MASTER observation
  3. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  4. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  5. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  6. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  7. SGR 1935+2154: Swift-BAT refined analysis
  8. GRB 191104B/GRB 191104C are SGR 1935+2154
  9. Trigger 933083: Swift detection of SGR 1935+2154
  10. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  11. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  12. GRB 190326A: Swift XRT and UVOT follow-up observations
  13. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  14. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  15. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  16. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  17. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  18. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  19. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  20. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  21. GRB 170524A: Swift detection of a burst (or possible new SGR)
  22. GRB 160821B: Swift-BAT refined analysis
  23. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  24. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  25. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  26. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  27. Konus-Wind observation of a bright burst from SGR 1935+2154
  28. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  29. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  30. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  31. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  32. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  33. Trigger 701182: Swift detection of SGR 1935+2154
  34. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  35. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  36. Fermi GBM Trigger 160622573 is not a GRB
  37. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  38. More FERMI GBM bursts from the magnetar SGR 1935+2154
  39. SGR 1935+2154: MAXI/GSC detection
  40. Fermi GBM trigger 488128598/160620637 is not a GRB
  41. Fermi GBM trigger 487974449/160618852 is not a GRB
  42. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  43. Trigger 689353: Swift detection of a transient near Sgr A*
  44. Fermi GBM trigger 486562774/160602514 is not a GRB
  45. Another Swift detection of SGR 1935+2154 (trigger #687124)
  46. Swift detection of SGR 1935+2154
  47. Konus-Wind observation of a bright burst from SGR 1935+2154
  48. FERMI GBM bursts from the magnetar SGR 1935+2154
  49. SGR 1935+2154: AbAO optical upper limit
  50. Fermi GBM triggers of SGR 1935+2154
  51. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  52. Fermi GBM trigger 485124591/160516868 is not a GRB
  53. Trigger 686443: Swift detection of SGR 1935+2154
  54. Fermi GBM trigger 484906918/160514349 is not a GRB
  55. SGR 0755-2933, Swift-BAT refined analysis
  56. Swift detection of a likely new SGR: SGR 0755-2933
  57. IBAS Alert 7313 is SGR J1935+2154
  58. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  59. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  60. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  61. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  62. Trigger 649113: Swift detection of SGR 1E 1841-045
  63. Swift-XRT observations of GRB 150710A
  64. Konus-Wind observation of a bright burst from SGR 1935+2154
  65. IPN Triangulation of a bright burst from SGR 1935+2154
  66. GRB 150301A: Swift-BAT refined analysis
  67. GRB 150301A: Fermi GBM observation
  68. GRB 150301A: Swift detection of a short burst or new SGR
  69. Fermi GBM Observations of SGR 1935+2154
  70. Fermi GBM trigger 150223068 is not a GRB
  71. SGR 1935+2154: Swift-BAT refined analysis
  72. Swift detection of an outburst from SGR 1935+2154
  73. Trigger 607399: Swift detection of SGR1806-20
  74. Fermi GBM Observations of SGR 1935+2154
  75. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  76. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  77. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  78. SGR 1935+2154: Swift-BAT observations of additional short soft events
  79. GRB 140705A / SGR 1935+2154: FTN observations
  80. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  81. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  82. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  83. Trigger 597570: Swift detection of SGR 1806-20
  84. GRB 131030A: T21 optical observations
  85. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  86. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  87. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  88. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  89. Trigger 565443: Swift detection of a burst from SGR J1745-29
  90. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  91. Trigger 557640: Swift detection of burst from SGR J1745-29
  92. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  93. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  94. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  95. Trigger 549841: Swift detection of SGR1806-20
  96. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  97. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  98. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  99. Trigger 535747: Swift detection of an outburst from SGR1806-20
  100. Fermi/GBM detection of an SGR-like burst

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