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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"

615 results found.

  1. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  2. Trigger 565443: Swift detection of a burst from SGR J1745-29
  3. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  4. Trigger 557640: Swift detection of burst from SGR J1745-29
  5. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  6. Trigger 555096: Swift detection of a possible burst
  7. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  8. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  9. Trigger 549841: Swift detection of SGR1806-20
  10. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  11. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  12. GRB 121125A: Swift/UVOT Detection
  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. Swift detection of short bursts from PSR J1647-4552
  22. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  23. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  24. Swift detection of an SGR burst from Swift J1834.9-0846
  25. SGR 1834.9-0846/ GRB 110807A, I-band observations
  26. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  27. SGR J1834.9-0846: A Neutron Star in W41?
  28. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  29. Fermi GBM detection of a SGR-like burst
  30. GRB 110807A: Swift detection of a burst or a posible new SGR
  31. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  32. Swift J1822.3-1606
  33. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  34. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  35. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  36. SGR 1E 1841-045: Swift-BAT refined analysis
  37. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  38. SGR 1E 1841-045: Swift-BAT refined analysis
  39. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  40. GRB 110406A: Positional coincidence with NGC 404
  41. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  42. Fermi GBM detection of an SGR-like burst
  43. SGR-like outburst from the magnetar 1E 1841-04.5
  44. Fermi GBM detection of a burst from a galactic source
  45. Swift-BAT trigger 421695 is likely not astrophysical
  46. Swift-BAT refined analysis of trigger 421262
  47. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  48. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  49. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  50. SGR 1833-0832: Swift/UVOT Upper Limits
  51. SGR 1833-0832: Archival Chandra Observations
  52. SGR 1833-0832 is pulsed at 7.56 seconds
  53. SGR 1833-0832 is pulsed at 7.56 seconds
  54. Possible pulsation period in SGR 1833-0832
  55. Discovery of the Spin Period of SGR 1833-0832
  56. Probable SGR 1833-0832: Swift-XRT refined analysis
  57. Probable SGR 1833-0832: Enhanced Swift-XRT position
  58. Swift-XRT refined position of the probable new SGR 1833-0832
  59. Swift-BAT refined analysis of the probable new SGR 1833-0832
  60. GRB 100319A: Swift detection of a burst; possible SGR
  61. Swift Trigger #382159 is due to XTE J1752-223
  62. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  63. RXTE Discovery of Pulsations from SGR 0418+5729
  64. Konus-RF observation of SGR burst 090605A
  65. Discovery of a new soft gamma repeater source, SGR 0418+5729
  66. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  67. GRB 090417A: Early-type nature of the putative host
  68. GRB 090417A: nearby galaxy redshift
  69. SGR J1550-5418: two Fermi GBM triggers on March 22
  70. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  71. ATCA observation of SGR J1550-5418
  72. GRB 090303: Fermi GBM detection
  73. Konus-RF catches first GRB and SGR bursts
  74. SGR J1550-5418
  75. Ongoing activity of AXP/SGR 1E1547.0-5408
  76. SGR activity seen by BAT during ICSP Ionospheric Events
  77. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  78. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  79. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  80. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  81. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  82. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  83. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  84. Trigger 340734: Swift detection of a possible short burst
  85. AXP 1E1547.0-5408 activity with SGR bursts
  86. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  87. SGR 1806-20: Fermi GBM detection.
  88. SGR 1806-20: Fermi GBM detection
  89. SGR 0501+4516: optical observations in August
  90. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  91. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  92. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  93. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  94. GRB 081024: Swift detection of a burst
  95. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  96. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  97. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  98. Trigger 330353: Swift detection of a Galactic short soft burst
  99. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  100. SGR 0501+4516 : P200 i-band observations

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