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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').
Advanced Search

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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

892 results found.

  1. SGR 1806-20, potential NIR counterpart
  2. Activivty of SGR 1806-20
  3. IBAS GRB Alerts n.1785 to 1791
  4. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  5. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  6. IBAS GRB Alert 1694
  7. IBAS GRB alerts 1679, 1680, 1681
  8. IBAS results on a burst from SGR1806-20
  9. IBAS alert 1180 refers to a burst from SGR 1806-20
  10. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  11. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  12. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  13. A burst from SGR 1806-20 detected with IBAS
  14. IPN triangulation of GRB030926 (short/hard; large error box)
  15. IBAS detection of bursts from SGR 1806-20
  16. Radio Observations of SGR1806-20
  17. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  18. Summary of recent IPN and HETE detections of SGR bursts
  19. Clarification of GCN 2354 on SGR1806-20
  20. IPN detection of continued activity from SGR1806-20
  21. 030813 SGR event (Konus-Wind observation)
  22. SGR 1808-20 (=H2802): A Possible new SGR
  23. SGR 1806-20, submm observations
  24. RXTE PCA Observations of SGR1806-20 Region
  25. GRBlog: Compilation of all GCN Circ. data
  26. IPN detection of renewed activity from SGR1806-20
  27. HETE detection of burst from SGR1806-20
  28. GRB030329 observed as a sudden ionospheric disturbance (SID)
  29. IPN triangulation of GRB030131 - CORRECTION
  30. IPN triangulation of GRB021219
  31. IPN detection of continued activity from SGR1806-20
  32. IPN detection of renewed activity from SGR1806-20
  33. IPN detection of continued SGR1900+14 activity
  34. IPN confirmation of the reactivation of SGR1900+14
  35. IPN detection of possible reactivation of SGR1900+14
  36. IPN triangulation of GRB021119 (annulus)
  37. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  38. SGR1900+14 activity, November 2-4, 2002
  39. Detection of activity from SGR 1900+14 with the RXTE/PCA
  40. IPN triangulation of GRB021025 (annulus)
  41. IPN detection of a burst from SGR1900+14
  42. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  43. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  44. AXP 1E2259+586: quasi-simultaneous optical observation
  45. AXP 1E2259+586 optical observations
  46. SGR-like Bursts from the AXP 1E 2259+586
  47. IPN detection of possible bursts from SGR1806-20
  48. IPN triangulation of GRB020525
  49. XRF 020427: Sudden Ionospheric Disturbance (SID)
  50. Mars Odyssey joins the IPN
  51. IPN detection and localization of Cygnus X-1 flares
  52. RXTE Observations of SGR 1900+14
  53. SGR1900+14 activity
  54. IPN/HETE Detection of Bursts from SGR1900+14
  55. IPN detection of further activity from SGR1806-20
  56. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  57. Probable SGR or Short Duration GRB Detected by HETE
  58. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  59. Possible burst from SGR1806-20
  60. IPN detection of SGR1900+14
  61. X-ray precursors to the large flare from SGR 1900+14
  62. SGR 1900+14: No evidence of extended X-ray emission
  63. SGR 1900+14 : RXTE observations
  64. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  65. SGR1900+14
  66. SGR 1900+14: Correction to GCN 1049
  67. Millimeter observation of SGR 1900+14
  68. SGR 1900+14: Detection of extended X-ray emission
  69. Chandra Observations of SGR 1900+14
  70. SGR 1900+14, Chandra observations
  71. Chandra Observations of SGR 1900+14
  72. SGR1900+14, I-band observations
  73. IPN triangulation of GRB 001004
  74. SGR 1806-20 burst activity
  75. GRB 991216--Summary of RXTE Observations
  76. BATSE GRB trigger criteria
  77. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  78. GRB990308 not a new SGR
  79. GRB990308, Possible new SGR~0209+70
  80. SGR1900+14, BeppoSAX-GRBM observations
  81. SGR1627-41
  82. SGR1627-41, RXTE/ASM observations
  83. Reduced error box of SGR 1627-41
  84. SGR 1627-41
  85. Discovery of a new SGR source, SGR1627-41
  86. SGR 1900+14
  87. SGR1900+14
  88. SGR1900+14
  89. BATSE on-board GRB trigger change
  90. IRAS 18119-1342 and the possible new SGR
  91. Possible new SGR from US Naval Observatory
  92. RXTE Observations of SGR 1814-13

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