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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"

883 results found.

  1. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  2. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  3. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  4. A burst from SGR 1806-20 detected with IBAS
  5. IPN triangulation of GRB030926 (short/hard; large error box)
  6. IBAS detection of bursts from SGR 1806-20
  7. Radio Observations of SGR1806-20
  8. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  9. Summary of recent IPN and HETE detections of SGR bursts
  10. Clarification of GCN 2354 on SGR1806-20
  11. IPN detection of continued activity from SGR1806-20
  12. 030813 SGR event (Konus-Wind observation)
  13. SGR 1808-20 (=H2802): A Possible new SGR
  14. SGR 1806-20, submm observations
  15. RXTE PCA Observations of SGR1806-20 Region
  16. GRBlog: Compilation of all GCN Circ. data
  17. IPN detection of renewed activity from SGR1806-20
  18. HETE detection of burst from SGR1806-20
  19. GRB030329 observed as a sudden ionospheric disturbance (SID)
  20. IPN triangulation of GRB030131 - CORRECTION
  21. IPN triangulation of GRB021219
  22. IPN detection of continued activity from SGR1806-20
  23. IPN detection of renewed activity from SGR1806-20
  24. IPN detection of continued SGR1900+14 activity
  25. IPN confirmation of the reactivation of SGR1900+14
  26. IPN detection of possible reactivation of SGR1900+14
  27. IPN triangulation of GRB021119 (annulus)
  28. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  29. SGR1900+14 activity, November 2-4, 2002
  30. Detection of activity from SGR 1900+14 with the RXTE/PCA
  31. IPN triangulation of GRB021025 (annulus)
  32. IPN detection of a burst from SGR1900+14
  33. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  34. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  35. AXP 1E2259+586: quasi-simultaneous optical observation
  36. AXP 1E2259+586 optical observations
  37. SGR-like Bursts from the AXP 1E 2259+586
  38. IPN detection of possible bursts from SGR1806-20
  39. IPN triangulation of GRB020525
  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. IPN triangulation of GRB 001004
  65. SGR 1806-20 burst activity
  66. GRB 991216--Summary of RXTE Observations
  67. BATSE GRB trigger criteria
  68. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  69. GRB990308 not a new SGR
  70. GRB990308, Possible new SGR~0209+70
  71. SGR1900+14, BeppoSAX-GRBM observations
  72. SGR1627-41
  73. SGR1627-41, RXTE/ASM observations
  74. Reduced error box of SGR 1627-41
  75. SGR 1627-41
  76. Discovery of a new SGR source, SGR1627-41
  77. SGR 1900+14
  78. SGR1900+14
  79. SGR1900+14
  80. BATSE on-board GRB trigger change
  81. IRAS 18119-1342 and the possible new SGR
  82. Possible new SGR from US Naval Observatory
  83. RXTE Observations of SGR 1814-13

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