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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"

19683 results found.

  1. GRB040422: optical and NIR observations at the VLT
  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. GRB040223, improved XMM position
  6. IBAS results on a burst from SGR1806-20
  7. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  8. IBAS alert 1180 refers to a burst from SGR 1806-20
  9. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  10. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  11. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  12. A burst from SGR 1806-20 detected with IBAS
  13. IPN triangulation of GRB030926 (short/hard; large error box)
  14. IBAS detection of bursts from SGR 1806-20
  15. Radio Observations of SGR1806-20
  16. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  17. Summary of recent IPN and HETE detections of SGR bursts
  18. Clarification of GCN 2354 on SGR1806-20
  19. IPN detection of continued activity from SGR1806-20
  20. 030813 SGR event (Konus-Wind observation)
  21. SGR 1808-20 (=H2802): A Possible new SGR
  22. SGR 1806-20, submm observations
  23. RXTE PCA Observations of SGR1806-20 Region
  24. HETE detection of burst from SGR1806-20
  25. GRB030329 observed as a sudden ionospheric disturbance (SID)
  26. IPN triangulation of GRB021219
  27. IPN detection of continued activity from SGR1806-20
  28. IPN detection of renewed activity from SGR1806-20
  29. IPN detection of continued SGR1900+14 activity
  30. IPN confirmation of the reactivation of SGR1900+14
  31. IPN detection of possible reactivation of SGR1900+14
  32. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  33. SGR1900+14 activity, November 2-4, 2002
  34. Detection of activity from SGR 1900+14 with the RXTE/PCA
  35. IPN detection of a burst from SGR1900+14
  36. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  37. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  38. AXP 1E2259+586: quasi-simultaneous optical observation
  39. AXP 1E2259+586 optical observations
  40. SGR-like Bursts from the AXP 1E 2259+586
  41. IPN detection of possible bursts from SGR1806-20
  42. XRF 020427: Sudden Ionospheric Disturbance (SID)
  43. Mars Odyssey joins the IPN
  44. IPN detection and localization of Cygnus X-1 flares
  45. RXTE Observations of SGR 1900+14
  46. SGR1900+14 activity
  47. IPN/HETE Detection of Bursts from SGR1900+14
  48. IPN detection of further activity from SGR1806-20
  49. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  50. Probable SGR or Short Duration GRB Detected by HETE
  51. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  52. Possible burst from SGR1806-20
  53. IPN detection of SGR1900+14
  54. X-ray precursors to the large flare from SGR 1900+14
  55. SGR 1900+14: No evidence of extended X-ray emission
  56. SGR 1900+14 : RXTE observations
  57. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  58. SGR1900+14
  59. SGR 1900+14: Correction to GCN 1049
  60. Millimeter observation of SGR 1900+14
  61. SGR 1900+14: Detection of extended X-ray emission
  62. Chandra Observations of SGR 1900+14
  63. SGR 1900+14, Chandra observations
  64. Chandra Observations of SGR 1900+14
  65. SGR1900+14, I-band observations
  66. SGR 1806-20 burst activity
  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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