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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').

579 results found.

  1. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  2. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  3. SGR 1E 1841-045: Swift-BAT refined analysis
  4. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  5. SGR 1E 1841-045: Swift-BAT refined analysis
  6. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  7. GRB 110406A: Positional coincidence with NGC 404
  8. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  9. Fermi GBM detection of an SGR-like burst
  10. SGR-like outburst from the magnetar 1E 1841-04.5
  11. Fermi GBM detection of a burst from a galactic source
  12. Swift-BAT trigger 421695 is likely not astrophysical
  13. Swift-BAT refined analysis of trigger 421262
  14. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  15. Spin down rate and inferred dipole magnetic field of the new soft gamma-ray repeater SGR 1833-0832
  16. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  17. SGR 1833-0832: Swift/UVOT Upper Limits
  18. SGR 1833-0832: Archival Chandra Observations
  19. SGR 1833-0832 is pulsed at 7.56 seconds
  20. SGR 1833-0832 is pulsed at 7.56 seconds
  21. Possible pulsation period in SGR 1833-0832
  22. Discovery of the Spin Period of SGR 1833-0832
  23. Probable SGR 1833-0832: Swift-XRT refined analysis
  24. Probable SGR 1833-0832: Enhanced Swift-XRT position
  25. Swift-XRT refined position of the probable new SGR 1833-0832
  26. Swift-BAT refined analysis of the probable new SGR 1833-0832
  27. GRB 100319A: Swift detection of a burst; possible SGR
  28. Swift Trigger #382159 is due to XTE J1752-223
  29. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  30. RXTE Discovery of Pulsations from SGR 0418+5729
  31. Konus-RF observation of SGR burst 090605A
  32. Discovery of a new soft gamma repeater source, SGR 0418+5729
  33. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  34. GRB 090417A: Early-type nature of the putative host
  35. GRB 090417A: nearby galaxy redshift
  36. SGR J1550-5418: two Fermi GBM triggers on March 22
  37. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  38. ATCA observation of SGR J1550-5418
  39. GRB 090303: Fermi GBM detection
  40. Konus-RF catches first GRB and SGR bursts
  41. SGR J1550-5418
  42. Ongoing activity of AXP/SGR 1E1547.0-5408
  43. SGR activity seen by BAT during ICSP Ionospheric Events
  44. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  45. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  46. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  47. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  48. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  49. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  50. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  51. Trigger 340734: Swift detection of a possible short burst
  52. AXP 1E1547.0-5408 activity with SGR bursts
  53. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  54. SGR 1806-20: Fermi GBM detection.
  55. SGR 1806-20: Fermi GBM detection
  56. SGR 0501+4516: optical observations in August
  57. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  58. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  59. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  60. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  61. GRB 081024: Swift detection of a burst
  62. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  63. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  64. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  65. Trigger 330353: Swift detection of a Galactic short soft burst
  66. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  67. SGR 0501+4516 : P200 i-band observations
  68. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  69. Recent VLA non-detection of SGR 0501+4516
  70. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  71. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  72. nIR observations of SGR 0501+4516
  73. INTEGRAL ToO observation of SGR0501+4516
  74. SGR 0501+4516: Confirmation of the NIR counterpart
  75. SGR 0501+4516: Detection of possible optical counterpart
  76. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  77. VLA non-detection of SGR 0501+4516
  78. Radio Detection of SGR 0501+4516: Retraction
  79. SGR 0501+4516: XMM-Newton monitoring schedule
  80. SGR 0501+4516: Decline in Activity
  81. SGR 0501+4516: Proximity to supernova remnant HB9
  82. Enhanced Swift-XRT position of SGR 0501+4516
  83. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  84. SGR 0501+4516: Swift XRT measure of the spin period
  85. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  86. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  87. Suzaku ToO Observation of SGR 0501+4516
  88. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  89. Konus-Wind observations of new SGR 0501+4516
  90. INTEGRAL ToO Observation of SGR0501+4516
  91. Radio Detection of SGR 0501+4516
  92. SGR 0501+4516: MDM Optical Observations
  93. SGR 0501+4516: Astrotel-Caucasus optical observations
  94. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  95. SGR 0501+4516: WSRT Radio Observations
  96. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  97. SGR 0501+4516: optical observations
  98. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  99. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  100. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516

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