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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"

11815 results found.

  1. GRB 050408: ROTSE-III Optical Limits
  2. Konus-Wind observation of GRB 050401
  3. GRB 050401 BAT refined analysis
  4. Swift Trigger 113225: P60 Observations
  5. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  6. Swift-BAT detection of GRB 050401
  7. GRB 050401: Prompt XRT position
  8. GRB050331: No Afterglow Detected
  9. Swift-BAT detection of GRB 050331
  10. Konus-Wind observation of GRB 050326
  11. GRB050326: optical limit 33min before GRB
  12. GRB050319, optical observations
  13. GRB050319: optical observation, March 20-22
  14. Swift-BAT detection of a bright outburst from SGR1806-20
  15. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  16. GRB 050319: ROTSE-III Refined Analysis
  17. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  18. GRB 050319: NIR afterglow candidate
  19. GRB 050319:Near IR afterglow
  20. GRB050319: BR optical photometry
  21. GRB 050319: Optical observation
  22. GRB050223: analysis of the XMM-Newton observation
  23. GRB050315: Radio afterglow
  24. GRB 050315: Absorption redshift
  25. GRB 050315: Optical afterglow identification
  26. GRB 050315: Swift XRT Position
  27. Swift-BAT detection of GRB 050315
  28. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  29. GRB 050306: R-band observations
  30. Swift trigger 107518: optical observation
  31. Ongoing activity of SGR 1806-20 after the giant flare
  32. GRB050215B: Late-Time Swift UVOT Observations
  33. INTEGRAL detection of GRB 050223
  34. GRB 050223 : Planned XMM-Newton observation
  35. GRB050223: ROTSE-III Optical Observations
  36. GRB 050219a: Optical observations from LCO
  37. GRB 050215b: Swift XRT Source Variability
  38. GRB 050215b : Lulin follow-up observation
  39. GRB050215B: ROTSE-III optical observations
  40. GRB050215A: ROTSE-III Optical Observations
  41. short/hard GRB 050202, optical observations
  42. GRB 050129: a weak long GRB detected with INTEGRAL
  43. SGR1806-20: Swift-BAT detection of a large normal burst
  44. SGR 1806-20: GMRT results at 240 MHz band.
  45. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  46. GRB 050128: Swift XRT prompt afterglow position
  47. GRB050126: Burst Parameters Measured by BAT
  48. GRB 050124 : Lulin R-band follow-up observation
  49. GRB050124: Refined BAT position, spectral and fluence information
  50. Unusual optical transient (GRB ???)
  51. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  52. GRB050117b: Swift-BAT detection of a weak burst
  53. GRB050117: optical observation
  54. GRB050117: Refined XRT position
  55. GRB050117: MASTER optical observations
  56. MASTER:GRB050117 SWIFT
  57. SGR 1806-20: RXTE/PCA pulse frequency during flare
  58. Triangulation of Short Hard GRB050112 (large error box)
  59. SGR 1806-20: Further VLA Observations
  60. SGR 1806-20: Further low frequency GMRT results
  61. SGR 1806-20: Further VLA Observations
  62. SGR1806-20: Swift-BAT observations of two additional bursts
  63. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  64. Further VLA observations of SGR 1806-20
  65. SGR 1806-20 and extragalactic short-duration GRBs
  66. Further ATCA observations of SGR 1806-20
  67. Fourth Epoch VLA observations of SGR 1806-20
  68. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  69. SGR 1806-20: Temporal and Spectral behavior of radio transient
  70. ATCA observations of SGR 1806-20
  71. SGR 1806-20, RHESSI observations of the 041227 giant flare
  72. Third epoch observations of SGR 1806-20 with VLA
  73. Second Epoch VLA observations of SGR 1806-20
  74. Second-epoch VLA observations of SGR 1806-20
  75. SGR1806: Detection of a Sudden Ionospheric Disturbance
  76. DETECTION OF POLARIZATION OF THE RADIO EMISSION FROM SGR 1806-20
  77. VLA observations of SGR 1806-20
  78. SGR1806 VLA Observations
  79. VLA observations of SGR 1806-20
  80. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  81. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  82. Detection of the SGR 1806-20 giant outburst back-scattered by the
  83. The giant outburst from SGR 1806-20
  84. IPN localization of giant flare from SGR1806-20
  85. Giant flare from SGR 1806-20 detected by INTEGRAL
  86. NIR Observations of GRB 041219
  87. GRB041226: ROTSE-III Optical Observations
  88. GRB041226: Swift-BAT detection of a burst
  89. GRB041224: ROTSE-III Optical Observations
  90. GRB041224: Swift-BAT detection of a soft burst
  91. GRB 041223: Detection of Optical Transient with LCO40
  92. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  93. GRB041223: ROTSE-III Optical Observations
  94. Very high activity of SGR 1806-20
  95. GRB 041219: WSRT Radio Afterglow Detection
  96. GRB 041219 : optical follow-up observations
  97. GRB041219c: Third Burst in One Day from Swift-BAT
  98. GRB041219: Optical Afterglow Detection
  99. GRB041218: optical observations
  100. GRB041219: P60 Optical Observations

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