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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"

610 results found.

  1. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  2. Trigger 549841: Swift detection of SGR1806-20
  3. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  4. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  5. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  6. Trigger 535747: Swift detection of an outburst from SGR1806-20
  7. Fermi/GBM detection of an SGR-like burst
  8. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  9. Swift starts a new program to find fainter transients
  10. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  11. Fermi GBM detection of an SGR-like burst
  12. Swift detection of an SGR burst from AXP 4U 0142+61
  13. GRB 111022A: Swift/UVOT Upper Limits
  14. Swift detection of short bursts from PSR J1647-4552
  15. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  16. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  17. Swift detection of an SGR burst from Swift J1834.9-0846
  18. SGR 1834.9-0846/ GRB 110807A, I-band observations
  19. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  20. SGR J1834.9-0846: A Neutron Star in W41?
  21. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  22. Fermi GBM detection of a SGR-like burst
  23. GRB 110807A: Swift detection of a burst or a posible new SGR
  24. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  25. Swift J1822.3-1606
  26. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  27. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  28. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  29. SGR 1E 1841-045: Swift-BAT refined analysis
  30. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  31. SGR 1E 1841-045: Swift-BAT refined analysis
  32. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  33. GRB 110406A: Positional coincidence with NGC 404
  34. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  35. Fermi GBM detection of an SGR-like burst
  36. SGR-like outburst from the magnetar 1E 1841-04.5
  37. Fermi GBM detection of a burst from a galactic source
  38. Swift-BAT trigger 421695 is likely not astrophysical
  39. Swift-BAT refined analysis of trigger 421262
  40. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  41. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  42. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  43. SGR 1833-0832: Swift/UVOT Upper Limits
  44. SGR 1833-0832: Archival Chandra Observations
  45. SGR 1833-0832 is pulsed at 7.56 seconds
  46. SGR 1833-0832 is pulsed at 7.56 seconds
  47. Possible pulsation period in SGR 1833-0832
  48. Discovery of the Spin Period of SGR 1833-0832
  49. Probable SGR 1833-0832: Swift-XRT refined analysis
  50. Probable SGR 1833-0832: Enhanced Swift-XRT position
  51. Swift-XRT refined position of the probable new SGR 1833-0832
  52. Swift-BAT refined analysis of the probable new SGR 1833-0832
  53. GRB 100319A: Swift detection of a burst; possible SGR
  54. Swift Trigger #382159 is due to XTE J1752-223
  55. GRB 090621A: MAGIC telescope GeV observation
  56. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  57. RXTE Discovery of Pulsations from SGR 0418+5729
  58. Konus-RF observation of SGR burst 090605A
  59. Discovery of a new soft gamma repeater source, SGR 0418+5729
  60. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  61. GRB 090417A: Early-type nature of the putative host
  62. GRB 090417A: nearby galaxy redshift
  63. SGR J1550-5418: two Fermi GBM triggers on March 22
  64. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  65. ATCA observation of SGR J1550-5418
  66. GRB 090303: Fermi GBM detection
  67. Konus-RF catches first GRB and SGR bursts
  68. SGR J1550-5418
  69. Ongoing activity of AXP/SGR 1E1547.0-5408
  70. SGR activity seen by BAT during ICSP Ionospheric Events
  71. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  72. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  73. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  74. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  75. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  76. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  77. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  78. Trigger 340734: Swift detection of a possible short burst
  79. AXP 1E1547.0-5408 activity with SGR bursts
  80. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  81. SGR 1806-20: Fermi GBM detection.
  82. SGR 1806-20: Fermi GBM detection
  83. SGR 0501+4516: optical observations in August
  84. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  85. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  86. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  87. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  88. GRB 081024: Swift detection of a burst
  89. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  90. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  91. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  92. Trigger 330353: Swift detection of a Galactic short soft burst
  93. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  94. SGR 0501+4516 : P200 i-band observations
  95. GRB080913: Swift/UVOT Upper Limits
  96. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  97. Recent VLA non-detection of SGR 0501+4516
  98. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  99. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  100. nIR observations of SGR 0501+4516

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