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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"

900 results found.

  1. Swift-XRT observations of GRB 150710A
  2. Swift trigger 642453 is not an astrophysical source
  3. Konus-Wind observation of a bright burst from SGR 1935+2154
  4. IPN Triangulation of a bright burst from SGR 1935+2154
  5. GRB 150301A: Swift-BAT refined analysis
  6. GRB 150301A: Fermi GBM observation
  7. GRB 150301A: Swift detection of a short burst or new SGR
  8. Fermi GBM Observations of SGR 1935+2154
  9. Fermi GBM trigger 150223068 is not a GRB
  10. SGR 1935+2154: Swift-BAT refined analysis
  11. Swift detection of an outburst from SGR 1935+2154
  12. Trigger 607399: Swift detection of SGR1806-20
  13. Fermi GBM Observations of SGR 1935+2154
  14. GRB 140710B: a long GRB detected with INTEGRAL
  15. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  16. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  17. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  18. SGR 1935+2154: Swift-BAT observations of additional short soft events
  19. GRB 140705A / SGR 1935+2154: FTN observations
  20. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  21. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  22. Swift detection of a bright X-ray source in M31
  23. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  24. Trigger 597570: Swift detection of SGR 1806-20
  25. GRB 131108A: AGILE/GRID observation
  26. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  27. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  28. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  29. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  30. GRB 130907A: INTEGRAL/SPI-ACS light curve
  31. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  32. Trigger 565443: Swift detection of a burst from SGR J1745-29
  33. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  34. GRB 130609B: Swift/UVOT Observations
  35. Trigger 557640: Swift detection of burst from SGR J1745-29
  36. GRB 130513A: a long GRB detected by INTEGRAL
  37. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  38. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  39. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  40. Trigger 549841: Swift detection of SGR1806-20
  41. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  42. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  43. GRB 121102A : a long GRB detected by INTEGRAL
  44. GRB 121027A: Swift-XRT refined Analysis
  45. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  46. Trigger 535747: Swift detection of an outburst from SGR1806-20
  47. Fermi/GBM detection of an SGR-like burst
  48. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  49. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  50. GRB 120624B: Swift-XRT observations
  51. Swift starts a new program to find fainter transients
  52. GRB 120512A: A long GRB detected by INTEGRAL
  53. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  54. Fermi GBM detection of an SGR-like burst
  55. Swift detection of an SGR burst from AXP 4U 0142+61
  56. Swift detection of short bursts from PSR J1647-4552
  57. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  58. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  59. Swift detection of an SGR burst from Swift J1834.9-0846
  60. SGR 1834.9-0846/ GRB 110807A, I-band observations
  61. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  62. SGR J1834.9-0846: A Neutron Star in W41?
  63. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  64. Fermi GBM detection of a SGR-like burst
  65. GRB 110807A: Swift detection of a burst or a posible new SGR
  66. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  67. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  68. Swift J1822.3-1606
  69. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  70. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  71. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  72. SGR 1E 1841-045: Swift-BAT refined analysis
  73. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  74. GRB 110625A: Fermi GBM and LAT observations
  75. SGR 1E 1841-045: Swift-BAT refined analysis
  76. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  77. GRB 110406A: Positional coincidence with NGC 404
  78. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  79. Fermi GBM detection of an SGR-like burst
  80. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  81. Fermi GBM detection of a burst from 1E 1841-045
  82. SGR-like outburst from the magnetar 1E 1841-04.5
  83. GRB 110112B: A short GRB detected by INTEGRAL
  84. Fermi GBM detection of a burst from a galactic source
  85. Swift-BAT trigger 421695 is likely not astrophysical
  86. Swift-BAT refined analysis of trigger 421262
  87. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  88. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  89. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  90. SGR 1833-0832: Swift/UVOT Upper Limits
  91. SGR 1833-0832: Archival Chandra Observations
  92. SGR 1833-0832 is pulsed at 7.56 seconds
  93. SGR 1833-0832 is pulsed at 7.56 seconds
  94. Possible pulsation period in SGR 1833-0832
  95. Discovery of the Spin Period of SGR 1833-0832
  96. Probable SGR 1833-0832: Swift-XRT refined analysis
  97. Probable SGR 1833-0832: Enhanced Swift-XRT position
  98. Swift-XRT refined position of the probable new SGR 1833-0832
  99. Swift-BAT refined analysis of the probable new SGR 1833-0832
  100. GRB 100319A: Swift detection of a burst; possible SGR

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