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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"

22208 results found.

  1. GRB 050412: Subaru observations
  2. GRB 050408: RTT150 optical observations
  3. GRB 050412: PROMPT VRcIc Observations
  4. GRB 050408: Kuiper 1.5m observations
  5. GRB 050412: optical observations
  6. GRB 050408: refined XRT analysis, no jet break seen yet
  7. GRB 050412: ANU 2.3m observations
  8. GRB 050412: Early Optical/Ultraviolet Observations with
  9. GRB 050412: LCO Optical Observations
  10. GRB 050412: Optical observations
  11. GRB050412: P60 Observations
  12. GRB 050412: LCO optical observations
  13. GRB 050412: IR and Optical observations
  14. GRB 050412: IR Observations
  15. GRB050408: Radio Observations
  16. GRB050410: P60 Observations
  17. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  18. GRB 050410, optical observations
  19. GRB 050408: PROMPT VRcIc Observations
  20. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  21. GRB 050410 R band Optical Observations
  22. GRB 050410, optical observations
  23. GRB050410: Radio Observations
  24. GRB 050408: Swift XRT measurement of possible jet break
  25. GRB050410: MASTER optical observations
  26. GRB 050410: Early observations with Swift-UVOT
  27. GRB 050408: Subaru Observations
  28. GRB 050408: WIDGET simultaneous optical observations
  29. GRB 050408: SOAR UBVRc Observations
  30. GRB 050408: Properties of the Host Galaxy
  31. GRB 050408: Mercator Optical Observations
  32. GRB050408: Radio Observations
  33. GRB 050408, SMARTS optical/IR afterglow observations
  34. GRB 050408, optical observations
  35. GRB 050408 Optical Observations
  36. GRB 050408: Mercator Optical Observations
  37. GRB 050408: First Optical observations with TFOSC at the RTT150
  38. GRB 050408, optical observations
  39. GRB 050408 optical candidate
  40. GRB050408: MASTER optical observations
  41. GRB050401: Radio Detection
  42. GRB 050406: Magellan optical observations
  43. GRB 050406: Early observations with Swift-UVOT
  44. GRB050401: Radio observation at 610 MHz with GMRT
  45. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  46. GRB 050401 Optical Observations
  47. GRB050401: TNG R-band observation
  48. GRB 050402A: IR Observations
  49. GRB 050402: Early observations with Swift-UVOT
  50. Swift Trigger 113225: P60 Observations
  51. GRB 050401: Optical afterglow confirmed
  52. GRB 050401: Optical afterglow candidate
  53. GRB050331: No Afterglow Detected
  54. GRB 050331: Swift UVOT Source
  55. GRB050319: radio observation
  56. GRB 050326: Early observations with Swift-UVOT
  57. GRB 050326: Swift XRT Position
  58. GRB050326: delayed XRT observation
  59. GRB050319, optical observations
  60. GRB050319, color indices
  61. GRB050319: optical observation, March 20-22
  62. GRB050319: RTT150 Optical Observations
  63. GRB 050319: ROTSE-III Refined Analysis
  64. GRB050319: VLA Observations
  65. GRB 050319 R band observations
  66. GRB 050319: Swift-UVOT detection of the afterglow
  67. GRB050319: Radio Observations
  68. GRB 050319: NIR afterglow candidate
  69. GRB 050319:Near IR afterglow
  70. GRB 050319 : Confirmation of optical afterglow decay
  71. GRB 050319: Detection of Possible Optical Counterpart
  72. GRB 050318: Swift/UVOT detection of afterglow emission
  73. RXTE Observations of GRB050318
  74. GRB 050315, SMARTS optical afterglow decay
  75. GRB050316: MASTER before, simultanious and follow up optical
  76. GRB050316: MASTER optical observations
  77. GRB 050315, SMARTS optical/IR afterglow observations
  78. GRB 050315 I-band observations
  79. GRB050315: Radio afterglow
  80. Non-detection of GRB050315 in ATCA Radio Observations
  81. GRB 050315: Swift XRT Position
  82. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  83. GRB 050315: Early Observations with Swift/UVOT
  84. Swift-BAT detection of GRB 050315
  85. GRB050223: No XMM-Newton OM detection of afterglow emission
  86. GRB 050306: Radio Observations
  87. GRB 050306: optical afterglow
  88. Swift-BAT trigger 107873: No Swift XRT counterpart
  89. GRB050309: Early optical limit from P60
  90. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  91. Swift 107873: P60 Optical Observations
  92. GRB 050306: CORRECTION to date of observation
  93. GRB 050306: R-band observations
  94. GRB 050306: No Swift UVOT Optical Counterpart Detected
  95. GRB 050306: REM optical-infrared observations
  96. GRB 050306: Possible X-ray Afterglow Position from the Swift
  97. GRB 050306: TAROT optical observations
  98. Ongoing activity of SGR 1806-20 after the giant flare
  99. GRB050215B: Late-Time Swift UVOT Observations
  100. GRB 050126: Confirmation of the NIR afterglow candidate

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