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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"

618 results found.

  1. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  2. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  3. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  4. Trigger 565443: Swift detection of a burst from SGR J1745-29
  5. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  6. Trigger 557640: Swift detection of burst from SGR J1745-29
  7. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  8. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  9. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  10. Trigger 549841: Swift detection of SGR1806-20
  11. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  12. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  13. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  14. Trigger 535747: Swift detection of an outburst from SGR1806-20
  15. Fermi/GBM detection of an SGR-like burst
  16. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  17. Swift starts a new program to find fainter transients
  18. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  19. Fermi GBM detection of an SGR-like burst
  20. Swift detection of an SGR burst from AXP 4U 0142+61
  21. GRB 111022A: Swift/UVOT Upper Limits
  22. Swift detection of short bursts from PSR J1647-4552
  23. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  24. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  25. Swift detection of an SGR burst from Swift J1834.9-0846
  26. SGR 1834.9-0846/ GRB 110807A, I-band observations
  27. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  28. SGR J1834.9-0846: A Neutron Star in W41?
  29. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  30. Fermi GBM detection of a SGR-like burst
  31. GRB 110807A: Swift detection of a burst or a posible new SGR
  32. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  33. Swift J1822.3-1606
  34. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  35. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  36. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  37. SGR 1E 1841-045: Swift-BAT refined analysis
  38. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  39. SGR 1E 1841-045: Swift-BAT refined analysis
  40. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  41. GRB 110406A: Positional coincidence with NGC 404
  42. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  43. Fermi GBM detection of an SGR-like burst
  44. SGR-like outburst from the magnetar 1E 1841-04.5
  45. Fermi GBM detection of a burst from a galactic source
  46. Swift-BAT trigger 421695 is likely not astrophysical
  47. Swift-BAT refined analysis of trigger 421262
  48. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  49. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  50. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  51. SGR 1833-0832: Swift/UVOT Upper Limits
  52. SGR 1833-0832: Archival Chandra Observations
  53. SGR 1833-0832 is pulsed at 7.56 seconds
  54. SGR 1833-0832 is pulsed at 7.56 seconds
  55. Possible pulsation period in SGR 1833-0832
  56. Discovery of the Spin Period of SGR 1833-0832
  57. Probable SGR 1833-0832: Swift-XRT refined analysis
  58. Probable SGR 1833-0832: Enhanced Swift-XRT position
  59. Swift-XRT refined position of the probable new SGR 1833-0832
  60. Swift-BAT refined analysis of the probable new SGR 1833-0832
  61. GRB 100319A: Swift detection of a burst; possible SGR
  62. Swift Trigger #382159 is due to XTE J1752-223
  63. GRB 090621A: MAGIC telescope GeV observation
  64. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  65. RXTE Discovery of Pulsations from SGR 0418+5729
  66. Konus-RF observation of SGR burst 090605A
  67. Discovery of a new soft gamma repeater source, SGR 0418+5729
  68. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  69. GRB 090417A: Early-type nature of the putative host
  70. GRB 090417A: nearby galaxy redshift
  71. SGR J1550-5418: two Fermi GBM triggers on March 22
  72. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  73. ATCA observation of SGR J1550-5418
  74. GRB 090303: Fermi GBM detection
  75. Konus-RF catches first GRB and SGR bursts
  76. SGR J1550-5418
  77. Ongoing activity of AXP/SGR 1E1547.0-5408
  78. SGR activity seen by BAT during ICSP Ionospheric Events
  79. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  80. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  81. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  82. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  83. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  84. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  85. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  86. Trigger 340734: Swift detection of a possible short burst
  87. AXP 1E1547.0-5408 activity with SGR bursts
  88. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  89. SGR 1806-20: Fermi GBM detection.
  90. SGR 1806-20: Fermi GBM detection
  91. SGR 0501+4516: optical observations in August
  92. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  93. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  94. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  95. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  96. GRB 081024: Swift detection of a burst
  97. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  98. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  99. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  100. Trigger 330353: Swift detection of a Galactic short soft burst

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