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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').

578 results found.

  1. GRB 080822 (SGR 0501+4516): archival optical observations
  2. New Soft Gamma Repeater 0501+4516 was GRB 080822
  3. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  4. Konus-Wind observation of reactivation of SGR 1627-41
  5. Reactivation of SGR 1627-41
  6. Disregard the "GRB 071126" position
  7. GRB 071017: a SHORT GRB detected by INTEGRAL
  8. INTEGRAL ToO observations of SGR1806-20
  9. SGR1806-20: Swift-BAT detection of enhanced activity
  10. Intense burst from SGR 1806-20 detected on September 7
  11. Swift detection of a outburst from SAX J1810.8-2609
  12. AGILE-ACS position for the SGR 1806-20 July 27 burst
  13. Intense burst from SGR 1806-20 detected on July 27
  14. Suzaku ToO observation of SGR 1806-20
  15. INTEGRAL ToO Observation of SGR1806-20
  16. long burst from SGR 1806-20 detected on March 26
  17. GRB 070201: clarification on localization and Konus-Wind spectra
  18. IPN localization of very intense short GRB 070201
  19. Two bright bursts from SGR 1806-20 detected with IBAS
  20. Image of the dust-scattering halo around SGR 1806-20
  21. Second VLA limit on new radio point source in SGR 1806-20
  22. A dust-scattering halo detected around SGR 1806-20
  23. VLA Upper Limit on Outburst of SGR 1806-20
  24. GRB060806 is similar to previous activity of SGR1806-20
  25. BAT Trigger #214277 is SGR 1900+14
  26. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  27. SGR 1900+14: Swift detection of an outburst
  28. SGR 1900+14: BAT observations
  29. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  30. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  31. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  32. SGR 1900+14: Swift-BAT detection of a bright outburst
  33. SGR 1900+14: CORRECTION to GCN 4923
  34. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  35. SGR 1900+14: Swift detection of renewed activity
  36. GRB 060218: rebrightening
  37. An extraordinary long burst on December 3 from SGR1806-20
  38. Possible resuming of the SGR 1806-20 activity
  39. GRB050925: analysis of the XMM-Newton observation
  40. GRB/SGR 050925: XMM-Newton ToO observation
  41. GRB051103: MASTER: OT limit and host galaxy candidates
  42. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  43. SGR 1806-20: continued moderate activity seen with INTEGRAL
  44. GRB/SGR 050925: IR Observations
  45. GRB050925: Swift-BAT detection of a short burst
  46. GRB 050906: Swift-BAT refined analysis
  47. GRB 050906: Bright galaxy in BAT error box
  48. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  49. Detection of an intermediate burst from SGR 1806-20 on August 8
  50. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  51. Konus-Wind observation of an intermediate burst from SGR 1806-20
  52. Renewal of SGR 1806-20 activity
  53. Ongoing activity of SGR 1806-20 after the giant flare
  54. SGR 1806-20: GMRT results at 240 MHz band.
  55. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  56. SGR 1806-20: RXTE/PCA pulse frequency during flare
  57. SGR 1806-20: Further VLA Observations
  58. SGR 1806-20: Further low frequency GMRT results
  59. SGR 1806-20: Further VLA Observations
  60. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  61. Further VLA observations of SGR 1806-20
  62. SGR 1806-20 and extragalactic short-duration GRBs
  63. Further ATCA observations of SGR 1806-20
  64. Fourth Epoch VLA observations of SGR 1806-20
  65. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  66. SGR 1806-20: Temporal and Spectral behavior of radio transient
  67. ATCA observations of SGR 1806-20
  68. SGR 1806-20, RHESSI observations of the 041227 giant flare
  69. Third epoch observations of SGR 1806-20 with VLA
  70. Second Epoch VLA observations of SGR 1806-20
  71. Second-epoch VLA observations of SGR 1806-20
  72. SGR1806: Detection of a Sudden Ionospheric Disturbance
  73. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  74. VLA observations of SGR 1806-20
  75. SGR1806 VLA Observations
  76. VLA observations of SGR 1806-20
  77. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  78. Detection of the SGR 1806-20 giant outburst back-scattered by the
  79. The giant outburst from SGR 1806-20
  80. Giant flare from SGR 1806-20 detected by INTEGRAL
  81. Very high activity of SGR 1806-20
  82. Summary of the recent bursts from SGR 1806-20
  83. IBAS GRB Alert # 2034
  84. Bright bursts from SGR1806-20
  85. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  86. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  87. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  88. SGR 1806-20 still active
  89. An intense burst from SGR1806-20
  90. Very bright burst detected from SGR 1806-20
  91. Increase of SGR 1806-20 activity
  92. Bursting activity from SGR 1806-20 detected with IBAS
  93. Ongoing activity of SGR 1806-20
  94. GRB040706:observation at University of Miyazaki
  95. SGR 1806-20: no IR variability of the proposed counterparts
  96. SGR 1806-20, potential NIR counterpart
  97. Activivty of SGR 1806-20
  98. IBAS GRB Alerts n.1785 to 1791
  99. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  100. IBAS GRB Alert 1694

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