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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.

Advanced Search Examples (click to copy):

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

900 results found.

  1. Swift detection of a outburst from SAX J1810.8-2609
  2. AGILE-ACS position for the SGR 1806-20 July 27 burst
  3. Intense burst from SGR 1806-20 detected on July 27
  4. GRB 070729: Swift-XRT refined analysis
  5. GRB 070520B: Swift-XRT refined analysis
  6. GRB 070520A: Swift-XRT refined analysis
  7. Suzaku ToO observation of SGR 1806-20
  8. INTEGRAL ToO Observation of SGR1806-20
  9. long burst from SGR 1806-20 detected on March 26
  10. GRB 070201: clarification on localization and Konus-Wind spectra
  11. IPN localization of very intense short GRB 070201
  12. GRB070107: Swift/XRT refined analysis
  13. GRB061222B: Swift-XRT Refined Analysis
  14. GRB061025: Swift XRT refined analysis
  15. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  16. GRB 060729: An update on the late-time Swift observations
  17. GRB 060926: Swift XRT refined analysis
  18. Two bright bursts from SGR 1806-20 detected with IBAS
  19. Image of the dust-scattering halo around SGR 1806-20
  20. Second VLA limit on new radio point source in SGR 1806-20
  21. A dust-scattering halo detected around SGR 1806-20
  22. VLA Upper Limit on Outburst of SGR 1806-20
  23. GRB060806 is similar to previous activity of SGR1806-20
  24. BAT Trigger #214277 is SGR 1900+14
  25. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  26. SGR 1900+14: Swift detection of an outburst
  27. SGR 1900+14: BAT observations
  28. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  29. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  30. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  31. SGR 1900+14: Swift-BAT detection of a bright outburst
  32. SGR 1900+14: CORRECTION to GCN 4923
  33. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  34. SGR 1900+14: Swift detection of renewed activity
  35. GRB 060218: rebrightening
  36. GRB060213: Swift XRT observations and possible afterglow candidate
  37. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  38. Swift XRT Observation of GRB 060204C
  39. GRB060203: Swift XRT Team Refined Analysis
  40. An extraordinary long burst on December 3 from SGR1806-20
  41. Possible resuming of the SGR 1806-20 activity
  42. GRB050925: analysis of the XMM-Newton observation
  43. GRB/SGR 050925: XMM-Newton ToO observation
  44. GRB051103: MASTER: OT limit and host galaxy candidates
  45. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  46. SGR 1806-20: continued moderate activity seen with INTEGRAL
  47. GRB/SGR 050925: IR Observations
  48. GRB050925: Swift-BAT detection of a short burst
  49. Possible GRB 050922 detected by INTEGRAL
  50. GRB 050906: Swift-BAT refined analysis
  51. GRB 050906: Bright galaxy in BAT error box
  52. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  53. Detection of an intermediate burst from SGR 1806-20 on August 8
  54. GRB 050716: Refined XRT analysis.
  55. H11603: An X-ray flare from V4641 Sgr, or a possible XRF
  56. Konus-Wind observation of an intermediate burst from SGR 1806-20
  57. GRB 050509B: Swift/XRT refined analysis
  58. Renewal of SGR 1806-20 activity
  59. GRB 050502 - A long GRB detected with INTEGRAL
  60. Ongoing activity of SGR 1806-20 after the giant flare
  61. SGR 1806-20: GMRT results at 240 MHz band.
  62. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  63. SGR 1806-20: RXTE/PCA pulse frequency during flare
  64. SGR 1806-20: Further VLA Observations
  65. SGR 1806-20: Further low frequency GMRT results
  66. SGR 1806-20: Further VLA Observations
  67. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  68. Further VLA observations of SGR 1806-20
  69. SGR 1806-20 and extragalactic short-duration GRBs
  70. Further ATCA observations of SGR 1806-20
  71. Fourth Epoch VLA observations of SGR 1806-20
  72. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  73. SGR 1806-20: Temporal and Spectral behavior of radio transient
  74. ATCA observations of SGR 1806-20
  75. SGR 1806-20, RHESSI observations of the 041227 giant flare
  76. Third epoch observations of SGR 1806-20 with VLA
  77. Second Epoch VLA observations of SGR 1806-20
  78. Second-epoch VLA observations of SGR 1806-20
  79. SGR1806: Detection of a Sudden Ionospheric Disturbance
  80. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  81. VLA observations of SGR 1806-20
  82. SGR1806 VLA Observations
  83. VLA observations of SGR 1806-20
  84. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  85. Detection of the SGR 1806-20 giant outburst back-scattered by the
  86. The giant outburst from SGR 1806-20
  87. Giant flare from SGR 1806-20 detected by INTEGRAL
  88. Very high activity of SGR 1806-20
  89. GRB041220: Swift-BAT burst
  90. Swift-BAT detection of the bright long burst GRB041219
  91. GRB 041219 - A long GRB detected by INTEGRAL
  92. Summary of the recent bursts from SGR 1806-20
  93. IBAS GRB Alert # 2034
  94. Bright bursts from SGR1806-20
  95. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  96. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  97. Very strong outburst from SGR 1806-20 detected with INTEGRAL
  98. SGR 1806-20 still active
  99. An intense burst from SGR1806-20
  100. Very bright burst detected from SGR 1806-20

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