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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"

611 results found.

  1. Swift detection of multiple bursts from SGR 1935+2154
  2. Konus-Wind observation of a bright burst from SGR 1935+2154
  3. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  4. IPN Triangulation of a bright burst from SGR 1935+2154
  5. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  6. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  7. Konus-Wind observation of a bright burst from SGR 1935+2154
  8. SGR 1935+2154: Fermi GBM observation
  9. IPN Triangulation of a bright burst from SGR 1935+2154
  10. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  11. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  12. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  13. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  14. Konus-Wind observation of the recent SGR 1935+2154 activity
  15. Swift trigger 933276 MASTER observation
  16. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  17. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  18. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  19. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  20. SGR 1935+2154: Swift-BAT refined analysis
  21. GRB 191104B/GRB 191104C are SGR 1935+2154
  22. Trigger 933083: Swift detection of SGR 1935+2154
  23. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  24. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  25. Fermi trigger No 588801358 Global MASTER-Net observations report
  26. GRB 190326A: Swift XRT and UVOT follow-up observations
  27. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  28. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  29. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  30. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  31. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  32. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  33. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  34. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  35. GRB 170524A: Swift detection of a burst (or possible new SGR)
  36. GRB 160821B: Swift-BAT refined analysis
  37. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  38. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  39. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  40. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  41. Konus-Wind observation of a bright burst from SGR 1935+2154
  42. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  43. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  44. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  45. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  46. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  47. Trigger 701182: Swift detection of SGR 1935+2154
  48. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  49. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  50. Fermi GBM Trigger 160622573 is not a GRB
  51. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  52. More FERMI GBM bursts from the magnetar SGR 1935+2154
  53. SGR 1935+2154: MAXI/GSC detection
  54. Fermi GBM trigger 488128598/160620637 is not a GRB
  55. Fermi GBM trigger 487974449/160618852 is not a GRB
  56. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  57. Trigger 689353: Swift detection of a transient near Sgr A*
  58. Fermi GBM trigger 486562774/160602514 is not a GRB
  59. Another Swift detection of SGR 1935+2154 (trigger #687124)
  60. Swift detection of SGR 1935+2154
  61. Konus-Wind observation of a bright burst from SGR 1935+2154
  62. FERMI GBM bursts from the magnetar SGR 1935+2154
  63. SGR 1935+2154: AbAO optical upper limit
  64. Fermi GBM triggers of SGR 1935+2154
  65. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  66. Fermi GBM trigger 485124591/160516868 is not a GRB
  67. Trigger 686443: Swift detection of SGR 1935+2154
  68. Fermi GBM trigger 484906918/160514349 is not a GRB
  69. SGR 0755-2933, Swift-BAT refined analysis
  70. Swift detection of a likely new SGR: SGR 0755-2933
  71. IBAS Alert 7313 is SGR J1935+2154
  72. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  73. GRB 151122A: Swift/UVOT Observations
  74. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  75. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  76. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  77. Trigger 649113: Swift detection of SGR 1E 1841-045
  78. Swift-XRT observations of GRB 150710A
  79. Konus-Wind observation of a bright burst from SGR 1935+2154
  80. IPN Triangulation of a bright burst from SGR 1935+2154
  81. GRB 150301A: Swift-BAT refined analysis
  82. GRB 150301A: Fermi GBM observation
  83. GRB 150301A: Swift detection of a short burst or new SGR
  84. Fermi GBM Observations of SGR 1935+2154
  85. Fermi GBM trigger 150223068 is not a GRB
  86. SGR 1935+2154: Swift-BAT refined analysis
  87. Swift detection of an outburst from SGR 1935+2154
  88. Trigger 607399: Swift detection of SGR1806-20
  89. Fermi GBM Observations of SGR 1935+2154
  90. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  91. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  92. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  93. SGR 1935+2154: Swift-BAT observations of additional short soft events
  94. GRB 140705A / SGR 1935+2154: FTN observations
  95. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  96. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  97. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  98. Trigger 597570: Swift detection of SGR 1806-20
  99. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  100. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29

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