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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').
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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.

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617 results found.

  1. SGR 1806-20 and extragalactic short-duration GRBs
  2. Further ATCA observations of SGR 1806-20
  3. Fourth Epoch VLA observations of SGR 1806-20
  4. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  5. SGR 1806-20: Temporal and Spectral behavior of radio transient
  6. ATCA observations of SGR 1806-20
  7. SGR 1806-20, RHESSI observations of the 041227 giant flare
  8. Third epoch observations of SGR 1806-20 with VLA
  9. Second Epoch VLA observations of SGR 1806-20
  10. Second-epoch VLA observations of SGR 1806-20
  11. SGR1806: Detection of a Sudden Ionospheric Disturbance
  12. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  13. VLA observations of SGR 1806-20
  14. SGR1806 VLA Observations
  15. VLA observations of SGR 1806-20
  16. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  17. Detection of the SGR 1806-20 giant outburst back-scattered by the
  18. The giant outburst from SGR 1806-20
  19. Giant flare from SGR 1806-20 detected by INTEGRAL
  20. Very high activity of SGR 1806-20
  21. Summary of the recent bursts from SGR 1806-20
  22. IBAS GRB Alert # 2034
  23. Bright bursts from SGR1806-20
  24. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  25. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  26. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  27. SGR 1806-20 still active
  28. An intense burst from SGR1806-20
  29. Very bright burst detected from SGR 1806-20
  30. Increase of SGR 1806-20 activity
  31. Bursting activity from SGR 1806-20 detected with IBAS
  32. Ongoing activity of SGR 1806-20
  33. GRB040706:observation at University of Miyazaki
  34. SGR 1806-20: no IR variability of the proposed counterparts
  35. SGR 1806-20, potential NIR counterpart
  36. Activivty of SGR 1806-20
  37. IBAS GRB Alerts n.1785 to 1791
  38. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  39. IBAS GRB Alert 1694
  40. IBAS GRB alerts 1679, 1680, 1681
  41. IBAS results on a burst from SGR1806-20
  42. IBAS alert 1180 refers to a burst from SGR 1806-20
  43. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  44. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  45. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  46. A burst from SGR 1806-20 detected with IBAS
  47. IPN triangulation of GRB030926 (short/hard; large error box)
  48. IBAS detection of bursts from SGR 1806-20
  49. Radio Observations of SGR1806-20
  50. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  51. Summary of recent IPN and HETE detections of SGR bursts
  52. Clarification of GCN 2354 on SGR1806-20
  53. IPN detection of continued activity from SGR1806-20
  54. 030813 SGR event (Konus-Wind observation)
  55. SGR 1808-20 (=H2802): A Possible new SGR
  56. SGR 1806-20, submm observations
  57. RXTE PCA Observations of SGR1806-20 Region
  58. HETE detection of burst from SGR1806-20
  59. GRB030329 observed as a sudden ionospheric disturbance (SID)
  60. IPN triangulation of GRB021219
  61. IPN detection of continued activity from SGR1806-20
  62. IPN detection of renewed activity from SGR1806-20
  63. IPN detection of continued SGR1900+14 activity
  64. IPN confirmation of the reactivation of SGR1900+14
  65. IPN detection of possible reactivation of SGR1900+14
  66. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  67. SGR1900+14 activity, November 2-4, 2002
  68. Detection of activity from SGR 1900+14 with the RXTE/PCA
  69. IPN detection of a burst from SGR1900+14
  70. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  71. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  72. AXP 1E2259+586: quasi-simultaneous optical observation
  73. AXP 1E2259+586 optical observations
  74. SGR-like Bursts from the AXP 1E 2259+586
  75. IPN detection of possible bursts from SGR1806-20
  76. XRF 020427: Sudden Ionospheric Disturbance (SID)
  77. Mars Odyssey joins the IPN
  78. IPN detection and localization of Cygnus X-1 flares
  79. RXTE Observations of SGR 1900+14
  80. SGR1900+14 activity
  81. IPN/HETE Detection of Bursts from SGR1900+14
  82. IPN detection of further activity from SGR1806-20
  83. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  84. Probable SGR or Short Duration GRB Detected by HETE
  85. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  86. Possible burst from SGR1806-20
  87. IPN detection of SGR1900+14
  88. X-ray precursors to the large flare from SGR 1900+14
  89. SGR 1900+14: No evidence of extended X-ray emission
  90. SGR 1900+14 : RXTE observations
  91. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  92. SGR1900+14
  93. SGR 1900+14: Correction to GCN 1049
  94. Millimeter observation of SGR 1900+14
  95. SGR 1900+14: Detection of extended X-ray emission
  96. Chandra Observations of SGR 1900+14
  97. SGR 1900+14, Chandra observations
  98. Chandra Observations of SGR 1900+14
  99. SGR1900+14, I-band observations
  100. SGR 1806-20 burst activity

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