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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"

675 results found.

  1. IBAS Alert 7313 is SGR J1935+2154
  2. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  3. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  4. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  5. LIGO/Virgo O1 extended until January 12
  6. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  7. Trigger 649113: Swift detection of SGR 1E 1841-045
  8. Swift-XRT observations of GRB 150710A
  9. GRB 150423A: Keck optical afterglow confirmation
  10. Konus-Wind observation of a bright burst from SGR 1935+2154
  11. IPN Triangulation of a bright burst from SGR 1935+2154
  12. GRB 150301A: Swift-BAT refined analysis
  13. GRB 150301A: Fermi GBM observation
  14. GRB 150301A: Swift detection of a short burst or new SGR
  15. Fermi GBM Observations of SGR 1935+2154
  16. Fermi GBM trigger 150223068 is not a GRB
  17. SGR 1935+2154: Swift-BAT refined analysis
  18. Swift detection of an outburst from SGR 1935+2154
  19. GRB 150202A: Swift detection of a burst
  20. GRB 141225A: Swift detection of a burst
  21. Trigger 607399: Swift detection of SGR1806-20
  22. Fermi GBM Observations of SGR 1935+2154
  23. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  24. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  25. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  26. SGR 1935+2154: Swift-BAT observations of additional short soft events
  27. GRB 140705A / SGR 1935+2154: FTN observations
  28. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  29. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  30. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  31. Trigger 597570: Swift detection of SGR 1806-20
  32. GRB 131127A: Swift detection of a burst
  33. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  34. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  35. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  36. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  37. Trigger 565443: Swift detection of a burst from SGR J1745-29
  38. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  39. Trigger 557640: Swift detection of burst from SGR J1745-29
  40. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  41. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  42. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  43. Trigger 549841: Swift detection of SGR1806-20
  44. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  45. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  46. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  47. Trigger 535747: Swift detection of an outburst from SGR1806-20
  48. GRB 120819A: Swift detection of a burst
  49. Trigger 530588: Swift detection of XMM J174457-2850.3
  50. Fermi/GBM detection of an SGR-like burst
  51. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  52. GRB 120722A: GROND detection of the afterglow
  53. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  54. Swift starts a new program to find fainter transients
  55. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  56. Fermi GBM detection of an SGR-like burst
  57. GRB 120212A: Swift detection of a burst
  58. Swift detection of an SGR burst from AXP 4U 0142+61
  59. GRB 111107A: Swift detection of a burst with an optical counterpart
  60. GRB 111016A: Swift detection of a burst
  61. Swift detection of short bursts from PSR J1647-4552
  62. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  63. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  64. Swift detection of an SGR burst from Swift J1834.9-0846
  65. SGR 1834.9-0846/ GRB 110807A, I-band observations
  66. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  67. SGR J1834.9-0846: A Neutron Star in W41?
  68. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  69. Fermi GBM detection of a SGR-like burst
  70. GRB 110807A: Swift detection of a burst or a posible new SGR
  71. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  72. Swift J1822.3-1606
  73. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  74. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  75. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  76. SGR 1E 1841-045: Swift-BAT refined analysis
  77. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  78. SGR 1E 1841-045: Swift-BAT refined analysis
  79. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  80. GRB 110406A: Positional coincidence with NGC 404
  81. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  82. GRB 110223A: Swift detection of a burst
  83. Fermi GBM detection of an SGR-like burst
  84. SGR-like outburst from the magnetar 1E 1841-04.5
  85. Fermi GBM detection of a burst from a galactic source
  86. Swift-BAT trigger 421695 is likely not astrophysical
  87. Swift-BAT refined analysis of trigger 421262
  88. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  89. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  90. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  91. SGR 1833-0832: Swift/UVOT Upper Limits
  92. SGR 1833-0832: Archival Chandra Observations
  93. SGR 1833-0832 is pulsed at 7.56 seconds
  94. SGR 1833-0832 is pulsed at 7.56 seconds
  95. Possible pulsation period in SGR 1833-0832
  96. Discovery of the Spin Period of SGR 1833-0832
  97. Probable SGR 1833-0832: Swift-XRT refined analysis
  98. Probable SGR 1833-0832: Enhanced Swift-XRT position
  99. Swift-XRT refined position of the probable new SGR 1833-0832
  100. Swift-BAT refined analysis of the probable new SGR 1833-0832

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