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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. SGR 0501+4516: optical observations
  2. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  3. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  4. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  5. Third event from SGR 0501+4516
  6. GRB 080822 (SGR 0501+4516): archival optical observations
  7. New Soft Gamma Repeater 0501+4516 was GRB 080822
  8. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  9. Konus-Wind observation of reactivation of SGR 1627-41
  10. Reactivation of SGR 1627-41
  11. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  12. Disregard the "GRB 071126" position
  13. GRB 071017: a SHORT GRB detected by INTEGRAL
  14. INTEGRAL ToO observations of SGR1806-20
  15. SGR1806-20: Swift-BAT detection of enhanced activity
  16. Intense burst from SGR 1806-20 detected on September 7
  17. Swift detection of a outburst from SAX J1810.8-2609
  18. AGILE-ACS position for the SGR 1806-20 July 27 burst
  19. Intense burst from SGR 1806-20 detected on July 27
  20. GRB070521 - SDSS Pre-Burst Observations
  21. Suzaku ToO observation of SGR 1806-20
  22. INTEGRAL ToO Observation of SGR1806-20
  23. long burst from SGR 1806-20 detected on March 26
  24. GRB 070311: Late Central Engine Activity Optical Flare??
  25. GRB 070201: clarification on localization and Konus-Wind spectra
  26. IPN localization of very intense short GRB 070201
  27. Two bright bursts from SGR 1806-20 detected with IBAS
  28. Image of the dust-scattering halo around SGR 1806-20
  29. Second VLA limit on new radio point source in SGR 1806-20
  30. A dust-scattering halo detected around SGR 1806-20
  31. VLA Upper Limit on Outburst of SGR 1806-20
  32. GRB060806 is similar to previous activity of SGR1806-20
  33. BAT Trigger #214277 is SGR 1900+14
  34. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  35. SGR 1900+14: Swift detection of an outburst
  36. SGR 1900+14: BAT observations
  37. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  38. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  39. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  40. SGR 1900+14: Swift-BAT detection of a bright outburst
  41. SGR 1900+14: CORRECTION to GCN 4923
  42. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  43. SGR 1900+14: Swift detection of renewed activity
  44. GRB 060218: rebrightening
  45. An extraordinary long burst on December 3 from SGR1806-20
  46. Possible resuming of the SGR 1806-20 activity
  47. GRB050925: analysis of the XMM-Newton observation
  48. GRB/SGR 050925: XMM-Newton ToO observation
  49. GRB051103: MASTER: OT limit and host galaxy candidates
  50. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  51. SGR 1806-20: continued moderate activity seen with INTEGRAL
  52. GRB/SGR 050925: IR Observations
  53. GRB050925: Swift-BAT detection of a short burst
  54. GRB 050906: Swift-BAT refined analysis
  55. GRB 050906: Bright galaxy in BAT error box
  56. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  57. Detection of an intermediate burst from SGR 1806-20 on August 8
  58. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  59. Konus-Wind observation of an intermediate burst from SGR 1806-20
  60. Renewal of SGR 1806-20 activity
  61. Ongoing activity of SGR 1806-20 after the giant flare
  62. SGR 1806-20: GMRT results at 240 MHz band.
  63. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  64. SGR 1806-20: RXTE/PCA pulse frequency during flare
  65. SGR 1806-20: Further VLA Observations
  66. SGR 1806-20: Further low frequency GMRT results
  67. SGR 1806-20: Further VLA Observations
  68. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  69. Further VLA observations of SGR 1806-20
  70. SGR 1806-20 and extragalactic short-duration GRBs
  71. Further ATCA observations of SGR 1806-20
  72. Fourth Epoch VLA observations of SGR 1806-20
  73. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  74. SGR 1806-20: Temporal and Spectral behavior of radio transient
  75. ATCA observations of SGR 1806-20
  76. SGR 1806-20, RHESSI observations of the 041227 giant flare
  77. Third epoch observations of SGR 1806-20 with VLA
  78. Second Epoch VLA observations of SGR 1806-20
  79. Second-epoch VLA observations of SGR 1806-20
  80. SGR1806: Detection of a Sudden Ionospheric Disturbance
  81. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  82. VLA observations of SGR 1806-20
  83. SGR1806 VLA Observations
  84. VLA observations of SGR 1806-20
  85. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  86. Detection of the SGR 1806-20 giant outburst back-scattered by the
  87. The giant outburst from SGR 1806-20
  88. Giant flare from SGR 1806-20 detected by INTEGRAL
  89. Very high activity of SGR 1806-20
  90. Summary of the recent bursts from SGR 1806-20
  91. IBAS GRB Alert # 2034
  92. Bright bursts from SGR1806-20
  93. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  94. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  95. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  96. SGR 1806-20 still active
  97. An intense burst from SGR1806-20
  98. Very bright burst detected from SGR 1806-20
  99. Increase of SGR 1806-20 activity
  100. Bursting activity from SGR 1806-20 detected with IBAS

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