Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

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"

611 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 554491: Swift detection of a spike possibly from Sgr A*
  7. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  8. Trigger 549841: Swift detection of SGR1806-20
  9. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  10. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  11. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  12. Trigger 535747: Swift detection of an outburst from SGR1806-20
  13. GRB 120807A: Swift/UVOT Upper Limits
  14. Fermi/GBM detection of an SGR-like burst
  15. Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
  16. Swift starts a new program to find fainter transients
  17. Fermi/GBM detection of a burst from the magnetar 1E 2259+5
  18. Fermi GBM detection of an SGR-like burst
  19. Swift detection of an SGR burst from AXP 4U 0142+61
  20. Swift detection of short bursts from PSR J1647-4552
  21. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  22. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  23. Swift detection of an SGR burst from Swift J1834.9-0846
  24. SGR 1834.9-0846/ GRB 110807A, I-band observations
  25. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  26. SGR J1834.9-0846: A Neutron Star in W41?
  27. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  28. Fermi GBM detection of a SGR-like burst
  29. GRB 110807A: Swift detection of a burst or a posible new SGR
  30. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  31. Swift J1822.3-1606
  32. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  33. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  34. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  35. SGR 1E 1841-045: Swift-BAT refined analysis
  36. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  37. SGR 1E 1841-045: Swift-BAT refined analysis
  38. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  39. GRB 110406A: Positional coincidence with NGC 404
  40. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  41. Fermi GBM detection of an SGR-like burst
  42. SGR-like outburst from the magnetar 1E 1841-04.5
  43. Fermi GBM detection of a burst from a galactic source
  44. Swift-BAT trigger 421695 is likely not astrophysical
  45. Swift-BAT refined analysis of trigger 421262
  46. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  47. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  48. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  49. SGR 1833-0832: Swift/UVOT Upper Limits
  50. SGR 1833-0832: Archival Chandra Observations
  51. SGR 1833-0832 is pulsed at 7.56 seconds
  52. SGR 1833-0832 is pulsed at 7.56 seconds
  53. Possible pulsation period in SGR 1833-0832
  54. Discovery of the Spin Period of SGR 1833-0832
  55. Probable SGR 1833-0832: Swift-XRT refined analysis
  56. Probable SGR 1833-0832: Enhanced Swift-XRT position
  57. Swift-XRT refined position of the probable new SGR 1833-0832
  58. Swift-BAT refined analysis of the probable new SGR 1833-0832
  59. GRB 100319A: Swift detection of a burst; possible SGR
  60. Swift Trigger #382159 is due to XTE J1752-223
  61. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  62. RXTE Discovery of Pulsations from SGR 0418+5729
  63. Konus-RF observation of SGR burst 090605A
  64. Discovery of a new soft gamma repeater source, SGR 0418+5729
  65. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  66. GRB 090417A: Early-type nature of the putative host
  67. GRB 090417A: nearby galaxy redshift
  68. SGR J1550-5418: two Fermi GBM triggers on March 22
  69. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  70. ATCA observation of SGR J1550-5418
  71. GRB 090303: Fermi GBM detection
  72. Konus-RF catches first GRB and SGR bursts
  73. SGR J1550-5418
  74. Ongoing activity of AXP/SGR 1E1547.0-5408
  75. SGR activity seen by BAT during ICSP Ionospheric Events
  76. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  77. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  78. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  79. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  80. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  81. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  82. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  83. Trigger 340734: Swift detection of a possible short burst
  84. AXP 1E1547.0-5408 activity with SGR bursts
  85. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  86. SGR 1806-20: Fermi GBM detection.
  87. SGR 1806-20: Fermi GBM detection
  88. SGR 0501+4516: optical observations in August
  89. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  90. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  91. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  92. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  93. GRB 081024: Swift detection of a burst
  94. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  95. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  96. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  97. Trigger 330353: Swift detection of a Galactic short soft burst
  98. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  99. SGR 0501+4516 : P200 i-band observations
  100. SGR J0501+4516: radio pulsar searches with GBT and WSRT

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov