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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28105 results found.

  1. GRB050410: Radio Observations
  2. GRB050410: MASTER optical observations
  3. GRB 050410: Early observations with Swift-UVOT
  4. Swift-BAT detection of GRB 050410
  5. GRB 050408: Inconsistency of host galaxy identification
  6. GRB 050408: Subaru Observations
  7. GRB 050408: WIDGET simultaneous optical observations
  8. GRB 050408: Properties of the Host Galaxy
  9. GRB050408: Radio Observations
  10. GRB 050408: Swift XRT analysis
  11. GRB 050408: Optical limit at 20 min after the burst
  12. GRB050408: REM NIR and Optical observation
  13. GRB 050408,optical observation
  14. GRB 050408: Mercator Optical Observations
  15. GRB 050408: Optical afterglow confirmed
  16. GRB 050408: opitcal observation
  17. GRB 050408, optical observations
  18. GRB 050408 optical candidate
  19. GRB 050408: Swift XRT Position
  20. GRB050408: MASTER optical observations
  21. GRB050401: Radio Detection
  22. GRB 050406: early Swift XRT analysis results
  23. GRB 050406 BAT refined analysis
  24. GRB 050406: Early observations with Swift-UVOT
  25. Swift-BAT detection of GRB 050406
  26. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  27. GRB 050401: VLT spectroscopic redshift
  28. GRB 050401 BAT refined analysis
  29. GRB050401: TNG R-band observation
  30. GRB 050402: Early observations with Swift-UVOT
  31. Swift Trigger 113225: P60 Observations
  32. GRB 050401: Optical afterglow confirmed
  33. GRB 050401: Prompt XRT position
  34. Retraction of three Swift GRB triggers
  35. GRB050331: No Afterglow Detected
  36. Swift-BAT detection of GRB 050331b
  37. GRB 050331: Swift UVOT Source
  38. Swift-BAT detection of GRB 050331
  39. GRB 050326: Early observations with Swift-UVOT
  40. GRB 050326 XMM-Newton observation
  41. GRB 050326: Swift XRT Position
  42. GRB 050326 BAT refined analysis
  43. GRB050326: delayed XRT observation
  44. GRB050319, color indices
  45. GRB050319: optical observation, March 20-22
  46. GRB050319: RTT150 Optical Observations
  47. Swift-BAT trigger 112060 is not a real GRB
  48. GRB 050318: Swift-BAT refined analysis
  49. GRB050319: VLA Observations
  50. GRB050319: radio observation
  51. GRB 050319: Swift-UVOT detection of the afterglow
  52. GRB 050315: Variability Analysis of Swift BAT Time History
  53. GRB050319: Radio Observations
  54. GRB 050319: NIR afterglow candidate
  55. GRB 050319:Near IR afterglow
  56. GRB 050318: SWIFT-UVOT refined analysis
  57. GRB 050319 : Confirmation of optical afterglow decay
  58. GRB 050319: Swift-BAT refined analysis
  59. GRB050319,optical observation
  60. GRB 050318: Swift/UVOT detection of afterglow emission
  61. RXTE Observations of GRB050318
  62. GRB050223: analysis of the XMM-Newton observation
  63. GRB050316: MASTER before, simultanious and follow up optical
  64. GRB 050306: ROTSE-III early limits
  65. GRB050316: MASTER optical observations
  66. GRB 050315: Swift-BAT further refined analysis
  67. GRB 050315 I-band observations
  68. GRB050315: Radio afterglow
  69. GRB050315: Swift-BAT Refined analysis
  70. Non-detection of GRB050315 in ATCA Radio Observations
  71. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  72. GRB 050315: Early Observations with Swift/UVOT
  73. GRB 050306: Radio Observations
  74. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  75. GRB 050306: optical afterglow
  76. Swift-BAT trigger 107873: No Swift XRT counterpart
  77. GRB 050306: Confirmation of X-ray afterglow
  78. GRB 050306: further TAROT optical data
  79. GRB050309: Early optical limit from P60
  80. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  81. GRB 050309 : Lulin R-band observation
  82. Swift 107873: P60 Optical Observations
  83. GRB 050306: R-band observations
  84. GRB 050306: REM optical-infrared observations
  85. GRB 050306: Possible X-ray Afterglow Position from the Swift
  86. GRB 050306: TAROT optical observations
  87. GRB 050306,optical observation
  88. Ongoing activity of SGR 1806-20 after the giant flare
  89. GRB050215B: Late-Time Swift UVOT Observations
  90. PROMPT VRcIc Observations of GRB 050223
  91. XRF/GRB 050215B: Radio Observations
  92. XMM-Newton Images of GRB 050223
  93. GRB 050219b: candidate NIR afterglow
  94. Confirmed XRF nature for GRB050215b
  95. GRB050223 XMM-Newton observation
  96. INTEGRAL detection of GRB 050223
  97. GRB050223: ROTSE-III Optical Observations
  98. GRB 050223 Swift/BAT detection of a burst
  99. GRB 050223: Swift XRT Position
  100. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash

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