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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').

578 results found.

  1. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  2. GRB 170524A: Swift detection of a burst (or possible new SGR)
  3. GRB 160821B: Swift-BAT refined analysis
  4. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  5. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  6. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  7. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  8. Konus-Wind observation of a bright burst from SGR 1935+2154
  9. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  10. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  11. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  12. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  13. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  14. Trigger 701182: Swift detection of SGR 1935+2154
  15. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  16. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  17. Fermi GBM Trigger 160622573 is not a GRB
  18. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  19. More FERMI GBM bursts from the magnetar SGR 1935+2154
  20. SGR 1935+2154: MAXI/GSC detection
  21. Fermi GBM trigger 488128598/160620637 is not a GRB
  22. Fermi GBM trigger 487974449/160618852 is not a GRB
  23. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  24. Trigger 689353: Swift detection of a transient near Sgr A*
  25. Fermi GBM trigger 486562774/160602514 is not a GRB
  26. Another Swift detection of SGR 1935+2154 (trigger #687124)
  27. Swift detection of SGR 1935+2154
  28. Konus-Wind observation of a bright burst from SGR 1935+2154
  29. FERMI GBM bursts from the magnetar SGR 1935+2154
  30. SGR 1935+2154: AbAO optical upper limit
  31. Fermi GBM triggers of SGR 1935+2154
  32. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  33. Fermi GBM trigger 485124591/160516868 is not a GRB
  34. Trigger 686443: Swift detection of SGR 1935+2154
  35. Fermi GBM trigger 484906918/160514349 is not a GRB
  36. SGR 0755-2933, Swift-BAT refined analysis
  37. Swift detection of a likely new SGR: SGR 0755-2933
  38. IBAS Alert 7313 is SGR J1935+2154
  39. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  40. GRB 151122A: Swift/UVOT Observations
  41. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  42. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  43. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  44. Trigger 649113: Swift detection of SGR 1E 1841-045
  45. Swift-XRT observations of GRB 150710A
  46. Konus-Wind observation of a bright burst from SGR 1935+2154
  47. IPN Triangulation of a bright burst from SGR 1935+2154
  48. GRB 150301A: Swift-BAT refined analysis
  49. GRB 150301A: Fermi GBM observation
  50. GRB 150301A: Swift detection of a short burst or new SGR
  51. Fermi GBM Observations of SGR 1935+2154
  52. Fermi GBM trigger 150223068 is not a GRB
  53. SGR 1935+2154: Swift-BAT refined analysis
  54. Swift detection of an outburst from SGR 1935+2154
  55. Trigger 607399: Swift detection of SGR1806-20
  56. Fermi GBM Observations of SGR 1935+2154
  57. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  58. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  59. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  60. SGR 1935+2154: Swift-BAT observations of additional short soft events
  61. GRB 140705A / SGR 1935+2154: FTN observations
  62. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  63. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  64. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  65. Trigger 597570: Swift detection of SGR 1806-20
  66. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  67. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  68. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  69. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  70. Trigger 565443: Swift detection of a burst from SGR J1745-29
  71. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  72. Trigger 557640: Swift detection of burst from SGR J1745-29
  73. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  74. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  75. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  76. Trigger 549841: Swift detection of SGR1806-20
  77. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  78. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  79. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  80. Trigger 535747: Swift detection of an outburst from SGR1806-20
  81. Fermi/GBM detection of an SGR-like burst
  82. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  83. Swift starts a new program to find fainter transients
  84. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  85. Fermi GBM detection of an SGR-like burst
  86. Swift detection of an SGR burst from AXP 4U 0142+61
  87. Swift detection of short bursts from PSR J1647-4552
  88. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  89. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  90. Swift detection of an SGR burst from Swift J1834.9-0846
  91. SGR 1834.9-0846/ GRB 110807A, I-band observations
  92. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  93. SGR J1834.9-0846: A Neutron Star in W41?
  94. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  95. Fermi GBM detection of a SGR-like burst
  96. GRB 110807A: Swift detection of a burst or a posible new SGR
  97. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  98. Swift J1822.3-1606
  99. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  100. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data

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