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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').

586 results found.

  1. Swift J1822.3-1606
  2. Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
  3. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  4. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  5. SGR 1E 1841-045: Swift-BAT refined analysis
  6. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  7. SGR 1E 1841-045: Swift-BAT refined analysis
  8. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  9. GRB 110406A: Positional coincidence with NGC 404
  10. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  11. Fermi GBM detection of an SGR-like burst
  12. SGR-like outburst from the magnetar 1E 1841-04.5
  13. Fermi GBM detection of a burst from a galactic source
  14. Swift-BAT trigger 421695 is likely not astrophysical
  15. Swift-BAT refined analysis of trigger 421262
  16. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  17. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  18. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  19. SGR 1833-0832: Swift/UVOT Upper Limits
  20. SGR 1833-0832: Archival Chandra Observations
  21. SGR 1833-0832 is pulsed at 7.56 seconds
  22. SGR 1833-0832 is pulsed at 7.56 seconds
  23. Possible pulsation period in SGR 1833-0832
  24. Discovery of the Spin Period of SGR 1833-0832
  25. Probable SGR 1833-0832: Swift-XRT refined analysis
  26. Probable SGR 1833-0832: Enhanced Swift-XRT position
  27. Swift-XRT refined position of the probable new SGR 1833-0832
  28. Swift-BAT refined analysis of the probable new SGR 1833-0832
  29. GRB 100319A: Swift detection of a burst; possible SGR
  30. Swift Trigger #382159 is due to XTE J1752-223
  31. GRB 090621A: MAGIC telescope GeV observation
  32. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  33. RXTE Discovery of Pulsations from SGR 0418+5729
  34. Konus-RF observation of SGR burst 090605A
  35. Discovery of a new soft gamma repeater source, SGR 0418+5729
  36. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  37. GRB 090417A: Early-type nature of the putative host
  38. GRB 090417A: nearby galaxy redshift
  39. SGR J1550-5418: two Fermi GBM triggers on March 22
  40. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  41. ATCA observation of SGR J1550-5418
  42. GRB 090303: Fermi GBM detection
  43. Konus-RF catches first GRB and SGR bursts
  44. SGR J1550-5418
  45. Ongoing activity of AXP/SGR 1E1547.0-5408
  46. SGR activity seen by BAT during ICSP Ionospheric Events
  47. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  48. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  49. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  50. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  51. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  52. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  53. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  54. Trigger 340734: Swift detection of a possible short burst
  55. AXP 1E1547.0-5408 activity with SGR bursts
  56. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  57. SGR 1806-20: Fermi GBM detection.
  58. SGR 1806-20: Fermi GBM detection
  59. SGR 0501+4516: optical observations in August
  60. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  61. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  62. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  63. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  64. GRB 081024: Swift detection of a burst
  65. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  66. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  67. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  68. Trigger 330353: Swift detection of a Galactic short soft burst
  69. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  70. SGR 0501+4516 : P200 i-band observations
  71. GRB080913: Swift/UVOT Upper Limits
  72. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  73. Recent VLA non-detection of SGR 0501+4516
  74. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  75. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  76. nIR observations of SGR 0501+4516
  77. INTEGRAL ToO observation of SGR0501+4516
  78. SGR 0501+4516: Confirmation of the NIR counterpart
  79. SGR 0501+4516: Detection of possible optical counterpart
  80. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  81. VLA non-detection of SGR 0501+4516
  82. Radio Detection of SGR 0501+4516: Retraction
  83. SGR 0501+4516: XMM-Newton monitoring schedule
  84. SGR 0501+4516: Decline in Activity
  85. SGR 0501+4516: Proximity to supernova remnant HB9
  86. Enhanced Swift-XRT position of SGR 0501+4516
  87. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  88. SGR 0501+4516: Swift XRT measure of the spin period
  89. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  90. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  91. Suzaku ToO Observation of SGR 0501+4516
  92. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  93. Konus-Wind observations of new SGR 0501+4516
  94. INTEGRAL ToO Observation of SGR0501+4516
  95. Radio Detection of SGR 0501+4516
  96. SGR 0501+4516: MDM Optical Observations
  97. SGR 0501+4516: Astrotel-Caucasus optical observations
  98. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  99. SGR 0501+4516: WSRT Radio Observations
  100. Trigger 321551: Continued Large Flaring of SGR 0501+4516

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