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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"

608 results found.

  1. IPN Triangulation of a bright burst from SGR 1935+2154
  2. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  3. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  4. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  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. Swift GRB190613.17 Global MASTER-Net observations report
  18. GRB 190326A: Swift XRT and UVOT follow-up observations
  19. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  20. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  21. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  22. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  23. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  24. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  25. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  26. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  27. GRB 170524A: Swift detection of a burst (or possible new SGR)
  28. GRB 160821B: Swift-BAT refined analysis
  29. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  30. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  31. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  32. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  33. Konus-Wind observation of a bright burst from SGR 1935+2154
  34. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  35. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  36. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  37. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  38. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  39. Trigger 701182: Swift detection of SGR 1935+2154
  40. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  41. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  42. Fermi GBM Trigger 160622573 is not a GRB
  43. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  44. More FERMI GBM bursts from the magnetar SGR 1935+2154
  45. SGR 1935+2154: MAXI/GSC detection
  46. Fermi GBM trigger 488128598/160620637 is not a GRB
  47. Fermi GBM trigger 487974449/160618852 is not a GRB
  48. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  49. Trigger 689353: Swift detection of a transient near Sgr A*
  50. Fermi GBM trigger 486562774/160602514 is not a GRB
  51. Another Swift detection of SGR 1935+2154 (trigger #687124)
  52. Swift detection of SGR 1935+2154
  53. Konus-Wind observation of a bright burst from SGR 1935+2154
  54. FERMI GBM bursts from the magnetar SGR 1935+2154
  55. SGR 1935+2154: AbAO optical upper limit
  56. Fermi GBM triggers of SGR 1935+2154
  57. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  58. Fermi GBM trigger 485124591/160516868 is not a GRB
  59. Trigger 686443: Swift detection of SGR 1935+2154
  60. Fermi GBM trigger 484906918/160514349 is not a GRB
  61. SGR 0755-2933, Swift-BAT refined analysis
  62. Swift detection of a likely new SGR: SGR 0755-2933
  63. IBAS Alert 7313 is SGR J1935+2154
  64. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  65. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  66. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  67. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  68. Trigger 649113: Swift detection of SGR 1E 1841-045
  69. Swift-XRT observations of GRB 150710A
  70. Konus-Wind observation of a bright burst from SGR 1935+2154
  71. IPN Triangulation of a bright burst from SGR 1935+2154
  72. GRB 150301A: Swift-BAT refined analysis
  73. GRB 150301A: Fermi GBM observation
  74. GRB 150301A: Swift detection of a short burst or new SGR
  75. Fermi GBM Observations of SGR 1935+2154
  76. Fermi GBM trigger 150223068 is not a GRB
  77. SGR 1935+2154: Swift-BAT refined analysis
  78. Swift detection of an outburst from SGR 1935+2154
  79. Trigger 607399: Swift detection of SGR1806-20
  80. Fermi GBM Observations of SGR 1935+2154
  81. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  82. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  83. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  84. SGR 1935+2154: Swift-BAT observations of additional short soft events
  85. GRB 140705A / SGR 1935+2154: FTN observations
  86. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  87. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  88. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  89. Trigger 597570: Swift detection of SGR 1806-20
  90. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  91. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  92. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  93. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  94. Trigger 565443: Swift detection of a burst from SGR J1745-29
  95. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  96. Trigger 557640: Swift detection of burst from SGR J1745-29
  97. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  98. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  99. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  100. Trigger 549841: Swift detection of SGR1806-20

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