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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').

581 results found.

  1. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  2. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  3. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  4. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  5. GRB 170524A: Swift detection of a burst (or possible new SGR)
  6. GRB 160821B: Swift-BAT refined analysis
  7. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  8. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  9. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  10. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  11. Konus-Wind observation of a bright burst from SGR 1935+2154
  12. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  13. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  14. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  15. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  16. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  17. Trigger 701182: Swift detection of SGR 1935+2154
  18. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  19. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  20. Fermi GBM Trigger 160622573 is not a GRB
  21. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  22. More FERMI GBM bursts from the magnetar SGR 1935+2154
  23. SGR 1935+2154: MAXI/GSC detection
  24. Fermi GBM trigger 488128598/160620637 is not a GRB
  25. Fermi GBM trigger 487974449/160618852 is not a GRB
  26. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  27. Trigger 689353: Swift detection of a transient near Sgr A*
  28. Fermi GBM trigger 486562774/160602514 is not a GRB
  29. Another Swift detection of SGR 1935+2154 (trigger #687124)
  30. Swift detection of SGR 1935+2154
  31. Konus-Wind observation of a bright burst from SGR 1935+2154
  32. FERMI GBM bursts from the magnetar SGR 1935+2154
  33. SGR 1935+2154: AbAO optical upper limit
  34. Fermi GBM triggers of SGR 1935+2154
  35. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  36. Fermi GBM trigger 485124591/160516868 is not a GRB
  37. Trigger 686443: Swift detection of SGR 1935+2154
  38. Fermi GBM trigger 484906918/160514349 is not a GRB
  39. SGR 0755-2933, Swift-BAT refined analysis
  40. Swift detection of a likely new SGR: SGR 0755-2933
  41. IBAS Alert 7313 is SGR J1935+2154
  42. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  43. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  44. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  45. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  46. Trigger 649113: Swift detection of SGR 1E 1841-045
  47. Swift-XRT observations of GRB 150710A
  48. Konus-Wind observation of a bright burst from SGR 1935+2154
  49. IPN Triangulation of a bright burst from SGR 1935+2154
  50. GRB 150301A: Swift-BAT refined analysis
  51. GRB 150301A: Fermi GBM observation
  52. GRB 150301A: Swift detection of a short burst or new SGR
  53. Fermi GBM Observations of SGR 1935+2154
  54. Fermi GBM trigger 150223068 is not a GRB
  55. SGR 1935+2154: Swift-BAT refined analysis
  56. Swift detection of an outburst from SGR 1935+2154
  57. Trigger 607399: Swift detection of SGR1806-20
  58. Fermi GBM Observations of SGR 1935+2154
  59. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  60. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  61. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  62. SGR 1935+2154: Swift-BAT observations of additional short soft events
  63. GRB 140705A / SGR 1935+2154: FTN observations
  64. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  65. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  66. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  67. Trigger 597570: Swift detection of SGR 1806-20
  68. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  69. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  70. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  71. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  72. Trigger 565443: Swift detection of a burst from SGR J1745-29
  73. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  74. Trigger 557640: Swift detection of burst from SGR J1745-29
  75. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  76. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  77. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  78. Trigger 549841: Swift detection of SGR1806-20
  79. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  80. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  81. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  82. Trigger 535747: Swift detection of an outburst from SGR1806-20
  83. GRB 120807A: Swift/UVOT Upper Limits
  84. Fermi/GBM detection of an SGR-like burst
  85. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  86. Swift starts a new program to find fainter transients
  87. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  88. Fermi GBM detection of an SGR-like burst
  89. Swift detection of an SGR burst from AXP 4U 0142+61
  90. Swift detection of short bursts from PSR J1647-4552
  91. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  92. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  93. Swift detection of an SGR burst from Swift J1834.9-0846
  94. SGR 1834.9-0846/ GRB 110807A, I-band observations
  95. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  96. SGR J1834.9-0846: A Neutron Star in W41?
  97. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  98. Fermi GBM detection of a SGR-like burst
  99. GRB 110807A: Swift detection of a burst or a posible new SGR
  100. Swift detection of a SGR-like burst from the AXP 4U 0142+61

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