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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').

581 results found.

  1. IBAS GRB Alerts n.1785 to 1791
  2. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  3. IBAS GRB Alert 1694
  4. IBAS GRB alerts 1679, 1680, 1681
  5. IBAS results on a burst from SGR1806-20
  6. IBAS alert 1180 refers to a burst from SGR 1806-20
  7. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  8. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  9. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  10. A burst from SGR 1806-20 detected with IBAS
  11. IPN triangulation of GRB030926 (short/hard; large error box)
  12. IBAS detection of bursts from SGR 1806-20
  13. Radio Observations of SGR1806-20
  14. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  15. Summary of recent IPN and HETE detections of SGR bursts
  16. Clarification of GCN 2354 on SGR1806-20
  17. IPN detection of continued activity from SGR1806-20
  18. 030813 SGR event (Konus-Wind observation)
  19. SGR 1808-20 (=H2802): A Possible new SGR
  20. SGR 1806-20, submm observations
  21. RXTE PCA Observations of SGR1806-20 Region
  22. HETE detection of burst from SGR1806-20
  23. GRB030329 observed as a sudden ionospheric disturbance (SID)
  24. IPN triangulation of GRB021219
  25. IPN detection of continued activity from SGR1806-20
  26. IPN detection of renewed activity from SGR1806-20
  27. IPN detection of continued SGR1900+14 activity
  28. IPN confirmation of the reactivation of SGR1900+14
  29. IPN detection of possible reactivation of SGR1900+14
  30. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  31. SGR1900+14 activity, November 2-4, 2002
  32. Detection of activity from SGR 1900+14 with the RXTE/PCA
  33. IPN detection of a burst from SGR1900+14
  34. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  35. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  36. AXP 1E2259+586: quasi-simultaneous optical observation
  37. AXP 1E2259+586 optical observations
  38. SGR-like Bursts from the AXP 1E 2259+586
  39. IPN detection of possible bursts from SGR1806-20
  40. XRF 020427: Sudden Ionospheric Disturbance (SID)
  41. Mars Odyssey joins the IPN
  42. IPN detection and localization of Cygnus X-1 flares
  43. RXTE Observations of SGR 1900+14
  44. SGR1900+14 activity
  45. IPN/HETE Detection of Bursts from SGR1900+14
  46. IPN detection of further activity from SGR1806-20
  47. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  48. Probable SGR or Short Duration GRB Detected by HETE
  49. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  50. Possible burst from SGR1806-20
  51. IPN detection of SGR1900+14
  52. X-ray precursors to the large flare from SGR 1900+14
  53. SGR 1900+14: No evidence of extended X-ray emission
  54. SGR 1900+14 : RXTE observations
  55. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  56. SGR1900+14
  57. SGR 1900+14: Correction to GCN 1049
  58. Millimeter observation of SGR 1900+14
  59. SGR 1900+14: Detection of extended X-ray emission
  60. Chandra Observations of SGR 1900+14
  61. SGR 1900+14, Chandra observations
  62. Chandra Observations of SGR 1900+14
  63. SGR1900+14, I-band observations
  64. SGR 1806-20 burst activity
  65. BATSE GRB trigger criteria
  66. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  67. GRB990308 not a new SGR
  68. GRB990308, Possible new SGR~0209+70
  69. SGR1900+14, BeppoSAX-GRBM observations
  70. SGR1627-41
  71. SGR1627-41, RXTE/ASM observations
  72. Reduced error box of SGR 1627-41
  73. SGR 1627-41
  74. Discovery of a new SGR source, SGR1627-41
  75. SGR 1900+14
  76. SGR1900+14
  77. SGR1900+14
  78. BATSE on-board GRB trigger change
  79. Untitled
  80. Possible new SGR from US Naval Observatory
  81. RXTE Observations of SGR 1814-13

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