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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"

879 results found.

  1. Swift detection of a bright X-ray source in M31
  2. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  3. Trigger 597570: Swift detection of SGR 1806-20
  4. GRB 131108A: AGILE/GRID observation
  5. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  6. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  7. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  8. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  9. GRB 130907A: INTEGRAL/SPI-ACS light curve
  10. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  11. Trigger 565443: Swift detection of a burst from SGR J1745-29
  12. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  13. GRB 130609B: Swift/UVOT Observations
  14. Trigger 557640: Swift detection of burst from SGR J1745-29
  15. GRB 130513A: a long GRB detected by INTEGRAL
  16. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  17. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  18. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  19. Trigger 549841: Swift detection of SGR1806-20
  20. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  21. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  22. GRB 121102A : a long GRB detected by INTEGRAL
  23. GRB 121027A: Swift-XRT refined Analysis
  24. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  25. Trigger 535747: Swift detection of an outburst from SGR1806-20
  26. Fermi/GBM detection of an SGR-like burst
  27. Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
  28. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  29. GRB 120624B: Swift-XRT observations
  30. Swift starts a new program to find fainter transients
  31. GRB 120512A: A long GRB detected by INTEGRAL
  32. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  33. Fermi GBM detection of an SGR-like burst
  34. Swift detection of an SGR burst from AXP 4U 0142+61
  35. Swift detection of short bursts from PSR J1647-4552
  36. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  37. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  38. Swift detection of an SGR burst from Swift J1834.9-0846
  39. SGR 1834.9-0846/ GRB 110807A, I-band observations
  40. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  41. SGR J1834.9-0846: A Neutron Star in W41?
  42. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  43. Fermi GBM detection of a SGR-like burst
  44. GRB 110807A: Swift detection of a burst or a posible new SGR
  45. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  46. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  47. Swift J1822.3-1606
  48. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  49. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  50. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  51. SGR 1E 1841-045: Swift-BAT refined analysis
  52. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  53. GRB 110625A: Fermi GBM and LAT observations
  54. SGR 1E 1841-045: Swift-BAT refined analysis
  55. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  56. GRB 110406A: Positional coincidence with NGC 404
  57. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  58. Fermi GBM detection of an SGR-like burst
  59. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  60. Fermi GBM detection of a burst from 1E 1841-045
  61. SGR-like outburst from the magnetar 1E 1841-04.5
  62. GRB 110112B: A short GRB detected by INTEGRAL
  63. Fermi GBM detection of a burst from a galactic source
  64. Swift-BAT trigger 421695 is likely not astrophysical
  65. Swift-BAT refined analysis of trigger 421262
  66. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  67. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  68. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  69. SGR 1833-0832: Swift/UVOT Upper Limits
  70. SGR 1833-0832: Archival Chandra Observations
  71. SGR 1833-0832 is pulsed at 7.56 seconds
  72. SGR 1833-0832 is pulsed at 7.56 seconds
  73. Possible pulsation period in SGR 1833-0832
  74. Discovery of the Spin Period of SGR 1833-0832
  75. Probable SGR 1833-0832: Swift-XRT refined analysis
  76. Probable SGR 1833-0832: Enhanced Swift-XRT position
  77. Swift-XRT refined position of the probable new SGR 1833-0832
  78. Swift-BAT refined analysis of the probable new SGR 1833-0832
  79. GRB 100319A: Swift detection of a burst; possible SGR
  80. GRB 100316D: Pre-burst emission measured by BAT
  81. Swift Trigger #382159 is due to XTE J1752-223
  82. GRB 090709A: Quasiperiodic variations in the BAT light curve
  83. XRF 090702: Swift-XRT refined analysis
  84. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  85. RXTE Discovery of Pulsations from SGR 0418+5729
  86. Konus-RF observation of SGR burst 090605A
  87. Discovery of a new soft gamma repeater source, SGR 0418+5729
  88. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  89. GRB 090417A: Early-type nature of the putative host
  90. GRB 090417A: nearby galaxy redshift
  91. SGR J1550-5418: two Fermi GBM triggers on March 22
  92. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  93. ATCA observation of SGR J1550-5418
  94. GRB 090303: Fermi GBM detection
  95. Konus-RF catches first GRB and SGR bursts
  96. SGR J1550-5418
  97. Ongoing activity of AXP/SGR 1E1547.0-5408
  98. SGR activity seen by BAT during ICSP Ionospheric Events
  99. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  100. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB

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