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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').

823 results found.

  1. Fermi GBM trigger 486562774/160602514 is not a GRB
  2. Another Swift detection of SGR 1935+2154 (trigger #687124)
  3. Swift detection of SGR 1935+2154
  4. Konus-Wind observation of a bright burst from SGR 1935+2154
  5. FERMI GBM bursts from the magnetar SGR 1935+2154
  6. SGR 1935+2154: AbAO optical upper limit
  7. Fermi GBM triggers of SGR 1935+2154
  8. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  9. Fermi GBM trigger 485124591/160516868 is not a GRB
  10. Trigger 686443: Swift detection of SGR 1935+2154
  11. Fermi GBM trigger 484906918/160514349 is not a GRB
  12. GRB 160401A: a long GRB detected by INTEGRAL
  13. SGR 0755-2933, Swift-BAT refined analysis
  14. Swift detection of a likely new SGR: SGR 0755-2933
  15. IBAS Alert 7313 is SGR J1935+2154
  16. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  17. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  18. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  19. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  20. GRB 150912A: A long GRB detected by INTEGRAL
  21. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  22. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  23. Trigger 649113: Swift detection of SGR 1E 1841-045
  24. Swift-XRT observations of GRB 150710A
  25. Swift trigger 642453 is not an astrophysical source
  26. Konus-Wind observation of a bright burst from SGR 1935+2154
  27. IPN Triangulation of a bright burst from SGR 1935+2154
  28. GRB 150301A: Swift-BAT refined analysis
  29. GRB 150301A: Fermi GBM observation
  30. GRB 150301A: Swift detection of a short burst or new SGR
  31. Fermi GBM Observations of SGR 1935+2154
  32. Fermi GBM trigger 150223068 is not a GRB
  33. SGR 1935+2154: Swift-BAT refined analysis
  34. Swift detection of an outburst from SGR 1935+2154
  35. Trigger 607399: Swift detection of SGR1806-20
  36. Fermi GBM Observations of SGR 1935+2154
  37. GRB 140710B: a long GRB detected with INTEGRAL
  38. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  39. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  40. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  41. SGR 1935+2154: Swift-BAT observations of additional short soft events
  42. GRB 140705A / SGR 1935+2154: FTN observations
  43. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  44. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  45. Swift detection of a bright X-ray source in M31
  46. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  47. Trigger 597570: Swift detection of SGR 1806-20
  48. GRB 131108A: AGILE/GRID observation
  49. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  50. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  51. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  52. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  53. GRB 130907A: INTEGRAL/SPI-ACS light curve
  54. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  55. Trigger 565443: Swift detection of a burst from SGR J1745-29
  56. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  57. GRB 130609B: Swift/UVOT Observations
  58. Trigger 557640: Swift detection of burst from SGR J1745-29
  59. GRB 130513A: a long GRB detected by INTEGRAL
  60. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  61. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  62. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  63. Trigger 549841: Swift detection of SGR1806-20
  64. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  65. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  66. GRB 121102A : a long GRB detected by INTEGRAL
  67. GRB 121027A: Swift-XRT refined Analysis
  68. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  69. Trigger 535747: Swift detection of an outburst from SGR1806-20
  70. Fermi/GBM detection of an SGR-like burst
  71. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  72. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  73. GRB 120624B: Swift-XRT observations
  74. Swift starts a new program to find fainter transients
  75. GRB 120512A: A long GRB detected by INTEGRAL
  76. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  77. Fermi GBM detection of an SGR-like burst
  78. Swift detection of an SGR burst from AXP 4U 0142+61
  79. Swift detection of short bursts from PSR J1647-4552
  80. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  81. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  82. Swift detection of an SGR burst from Swift J1834.9-0846
  83. SGR 1834.9-0846/ GRB 110807A, I-band observations
  84. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  85. SGR J1834.9-0846: A Neutron Star in W41?
  86. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  87. Fermi GBM detection of a SGR-like burst
  88. GRB 110807A: Swift detection of a burst or a posible new SGR
  89. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  90. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  91. Swift J1822.3-1606
  92. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  93. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  94. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  95. SGR 1E 1841-045: Swift-BAT refined analysis
  96. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  97. GRB 110625A: Fermi GBM and LAT observations
  98. SGR 1E 1841-045: Swift-BAT refined analysis
  99. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  100. GRB 110406A: Positional coincidence with NGC 404

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