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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

865 results found.

  1. GRB 130513A: a long GRB detected by INTEGRAL
  2. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  3. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  4. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  5. Trigger 549841: Swift detection of SGR1806-20
  6. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  7. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  8. GRB 121102A : a long GRB detected by INTEGRAL
  9. GRB 121027A: Swift-XRT refined Analysis
  10. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  11. Trigger 535747: Swift detection of an outburst from SGR1806-20
  12. Fermi/GBM detection of an SGR-like burst
  13. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  14. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  15. GRB 120624B: Swift-XRT observations
  16. Swift starts a new program to find fainter transients
  17. GRB 120512A: A long GRB detected by INTEGRAL
  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: Transient Magnetar or Be X-ray Binary?
  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. GRB 110625A: Fermi GBM and LAT observations
  40. SGR 1E 1841-045: Swift-BAT refined analysis
  41. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  42. GRB 110406A: Positional coincidence with NGC 404
  43. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  44. Fermi GBM detection of an SGR-like burst
  45. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  46. Fermi GBM detection of a burst from 1E 1841-045
  47. SGR-like outburst from the magnetar 1E 1841-04.5
  48. GRB 110112B: A short GRB detected by INTEGRAL
  49. Fermi GBM detection of a burst from a galactic source
  50. Swift-BAT trigger 421695 is likely not astrophysical
  51. Swift-BAT refined analysis of trigger 421262
  52. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  53. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  54. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  55. SGR 1833-0832: Swift/UVOT Upper Limits
  56. SGR 1833-0832: Archival Chandra Observations
  57. SGR 1833-0832 is pulsed at 7.56 seconds
  58. SGR 1833-0832 is pulsed at 7.56 seconds
  59. Possible pulsation period in SGR 1833-0832
  60. Discovery of the Spin Period of SGR 1833-0832
  61. Probable SGR 1833-0832: Swift-XRT refined analysis
  62. Probable SGR 1833-0832: Enhanced Swift-XRT position
  63. Swift-XRT refined position of the probable new SGR 1833-0832
  64. Swift-BAT refined analysis of the probable new SGR 1833-0832
  65. GRB 100319A: Swift detection of a burst; possible SGR
  66. GRB 100316D: Pre-burst emission measured by BAT
  67. Swift Trigger #382159 is due to XTE J1752-223
  68. GRB 090709A: Quasiperiodic variations in the BAT light curve
  69. XRF 090702: Swift-XRT refined analysis
  70. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  71. RXTE Discovery of Pulsations from SGR 0418+5729
  72. Konus-RF observation of SGR burst 090605A
  73. Discovery of a new soft gamma repeater source, SGR 0418+5729
  74. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  75. GRB 090417A: Early-type nature of the putative host
  76. GRB 090417A: nearby galaxy redshift
  77. SGR J1550-5418: two Fermi GBM triggers on March 22
  78. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  79. ATCA observation of SGR J1550-5418
  80. GRB 090303: Fermi GBM detection
  81. Konus-RF catches first GRB and SGR bursts
  82. SGR J1550-5418
  83. Ongoing activity of AXP/SGR 1E1547.0-5408
  84. SGR activity seen by BAT during ICSP Ionospheric Events
  85. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  86. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  87. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  88. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  89. IBAS Alert N. 5442 is not a GRB
  90. Suzaku ToO Observation of AXP 1E 1547.0-5408
  91. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  92. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  93. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  94. Trigger 340734: Swift detection of a possible short burst
  95. AXP 1E1547.0-5408 activity with SGR bursts
  96. GRB 090111: Swift UVOT Upper Limits
  97. GRB 081222: Swift XRT refined analysis
  98. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  99. SGR 1806-20: Fermi GBM detection.
  100. SGR 1806-20: Fermi GBM detection

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