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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"

892 results found.

  1. Fermi GBM trigger 150223068 is not a GRB
  2. SGR 1935+2154: Swift-BAT refined analysis
  3. Swift detection of an outburst from SGR 1935+2154
  4. Trigger 607399: Swift detection of SGR1806-20
  5. Fermi GBM Observations of SGR 1935+2154
  6. GRB 140710B: a long GRB detected with INTEGRAL
  7. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  8. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  9. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  10. SGR 1935+2154: Swift-BAT observations of additional short soft events
  11. GRB 140705A / SGR 1935+2154: FTN observations
  12. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  13. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  14. Swift detection of a bright X-ray source in M31
  15. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  16. Trigger 597570: Swift detection of SGR 1806-20
  17. GRB 131108A: AGILE/GRID observation
  18. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  19. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  20. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  21. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  22. GRB 130907A: INTEGRAL/SPI-ACS light curve
  23. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  24. Trigger 565443: Swift detection of a burst from SGR J1745-29
  25. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  26. GRB 130609B: Swift/UVOT Observations
  27. Trigger 557640: Swift detection of burst from SGR J1745-29
  28. GRB 130513A: a long GRB detected by INTEGRAL
  29. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  30. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  31. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  32. Trigger 549841: Swift detection of SGR1806-20
  33. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  34. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  35. GRB 121102A : a long GRB detected by INTEGRAL
  36. GRB 121027A: Swift-XRT refined Analysis
  37. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  38. Trigger 535747: Swift detection of an outburst from SGR1806-20
  39. Fermi/GBM detection of an SGR-like burst
  40. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  41. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  42. GRB 120624B: Swift-XRT observations
  43. Swift starts a new program to find fainter transients
  44. GRB 120512A: A long GRB detected by INTEGRAL
  45. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  46. Fermi GBM detection of an SGR-like burst
  47. Swift detection of an SGR burst from AXP 4U 0142+61
  48. Swift detection of short bursts from PSR J1647-4552
  49. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  50. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  51. Swift detection of an SGR burst from Swift J1834.9-0846
  52. SGR 1834.9-0846/ GRB 110807A, I-band observations
  53. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  54. SGR J1834.9-0846: A Neutron Star in W41?
  55. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  56. Fermi GBM detection of a SGR-like burst
  57. GRB 110807A: Swift detection of a burst or a posible new SGR
  58. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  59. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  60. Swift J1822.3-1606
  61. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  62. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  63. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  64. SGR 1E 1841-045: Swift-BAT refined analysis
  65. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  66. GRB 110625A: Fermi GBM and LAT observations
  67. SGR 1E 1841-045: Swift-BAT refined analysis
  68. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  69. GRB 110406A: Positional coincidence with NGC 404
  70. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  71. Fermi GBM detection of an SGR-like burst
  72. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  73. Fermi GBM detection of a burst from 1E 1841-045
  74. SGR-like outburst from the magnetar 1E 1841-04.5
  75. GRB 110112B: A short GRB detected by INTEGRAL
  76. Fermi GBM detection of a burst from a galactic source
  77. Swift-BAT trigger 421695 is likely not astrophysical
  78. Swift-BAT refined analysis of trigger 421262
  79. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  80. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  81. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  82. SGR 1833-0832: Swift/UVOT Upper Limits
  83. SGR 1833-0832: Archival Chandra Observations
  84. SGR 1833-0832 is pulsed at 7.56 seconds
  85. SGR 1833-0832 is pulsed at 7.56 seconds
  86. Possible pulsation period in SGR 1833-0832
  87. Discovery of the Spin Period of SGR 1833-0832
  88. Probable SGR 1833-0832: Swift-XRT refined analysis
  89. Probable SGR 1833-0832: Enhanced Swift-XRT position
  90. Swift-XRT refined position of the probable new SGR 1833-0832
  91. Swift-BAT refined analysis of the probable new SGR 1833-0832
  92. GRB 100319A: Swift detection of a burst; possible SGR
  93. GRB 100316D: Pre-burst emission measured by BAT
  94. Swift Trigger #382159 is due to XTE J1752-223
  95. GRB 090709A: Quasiperiodic variations in the BAT light curve
  96. XRF 090702: Swift-XRT refined analysis
  97. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  98. RXTE Discovery of Pulsations from SGR 0418+5729
  99. Konus-RF observation of SGR burst 090605A
  100. Discovery of a new soft gamma repeater source, SGR 0418+5729

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