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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"

22212 results found.

  1. GRB 050416: ART observations
  2. GRB 050416: KAIT observations
  3. GRB050416: P200 NIR Observations
  4. GRB 050416: Radio observations
  5. GRB 050412: Subaru observations
  6. GRB 050408: RTT150 optical observations
  7. GRB 050412: PROMPT VRcIc Observations
  8. GRB 050408: Kuiper 1.5m observations
  9. GRB 050412: optical observations
  10. GRB 050408: refined XRT analysis, no jet break seen yet
  11. GRB 050412: ANU 2.3m observations
  12. GRB 050412: Early Optical/Ultraviolet Observations with
  13. GRB 050412: LCO Optical Observations
  14. GRB 050412: Optical observations
  15. GRB050412: P60 Observations
  16. GRB 050412: LCO optical observations
  17. GRB 050412: IR and Optical observations
  18. GRB 050412: IR Observations
  19. GRB050408: Radio Observations
  20. GRB050410: P60 Observations
  21. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  22. GRB 050410, optical observations
  23. GRB 050408: PROMPT VRcIc Observations
  24. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  25. GRB 050410 R band Optical Observations
  26. GRB 050410, optical observations
  27. GRB050410: Radio Observations
  28. GRB 050408: Swift XRT measurement of possible jet break
  29. GRB050410: MASTER optical observations
  30. GRB 050410: Early observations with Swift-UVOT
  31. GRB 050408: Subaru Observations
  32. GRB 050408: WIDGET simultaneous optical observations
  33. GRB 050408: SOAR UBVRc Observations
  34. GRB 050408: Properties of the Host Galaxy
  35. GRB 050408: Mercator Optical Observations
  36. GRB050408: Radio Observations
  37. GRB 050408, SMARTS optical/IR afterglow observations
  38. GRB 050408, optical observations
  39. GRB 050408 Optical Observations
  40. GRB 050408: Mercator Optical Observations
  41. GRB 050408: First Optical observations with TFOSC at the RTT150
  42. GRB 050408, optical observations
  43. GRB 050408 optical candidate
  44. GRB050408: MASTER optical observations
  45. GRB050401: Radio Detection
  46. GRB 050406: Magellan optical observations
  47. GRB 050406: Early observations with Swift-UVOT
  48. GRB050401: Radio observation at 610 MHz with GMRT
  49. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  50. GRB 050401 Optical Observations
  51. GRB050401: TNG R-band observation
  52. GRB 050402A: IR Observations
  53. GRB 050402: Early observations with Swift-UVOT
  54. Swift Trigger 113225: P60 Observations
  55. GRB 050401: Optical afterglow confirmed
  56. GRB 050401: Optical afterglow candidate
  57. GRB050331: No Afterglow Detected
  58. GRB 050331: Swift UVOT Source
  59. GRB050319: radio observation
  60. GRB 050326: Early observations with Swift-UVOT
  61. GRB 050326: Swift XRT Position
  62. GRB050326: delayed XRT observation
  63. GRB050319, optical observations
  64. GRB050319, color indices
  65. GRB050319: optical observation, March 20-22
  66. GRB050319: RTT150 Optical Observations
  67. GRB 050319: ROTSE-III Refined Analysis
  68. GRB050319: VLA Observations
  69. GRB 050319 R band observations
  70. GRB 050319: Swift-UVOT detection of the afterglow
  71. GRB050319: Radio Observations
  72. GRB 050319: NIR afterglow candidate
  73. GRB 050319:Near IR afterglow
  74. GRB 050319 : Confirmation of optical afterglow decay
  75. GRB 050319: Detection of Possible Optical Counterpart
  76. GRB 050318: Swift/UVOT detection of afterglow emission
  77. RXTE Observations of GRB050318
  78. GRB 050315, SMARTS optical afterglow decay
  79. GRB050316: MASTER before, simultanious and follow up optical
  80. GRB050316: MASTER optical observations
  81. GRB 050315, SMARTS optical/IR afterglow observations
  82. GRB 050315 I-band observations
  83. GRB050315: Radio afterglow
  84. Non-detection of GRB050315 in ATCA Radio Observations
  85. GRB 050315: Swift XRT Position
  86. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  87. GRB 050315: Early Observations with Swift/UVOT
  88. Swift-BAT detection of GRB 050315
  89. GRB050223: No XMM-Newton OM detection of afterglow emission
  90. GRB 050306: Radio Observations
  91. GRB 050306: optical afterglow
  92. Swift-BAT trigger 107873: No Swift XRT counterpart
  93. GRB050309: Early optical limit from P60
  94. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  95. Swift 107873: P60 Optical Observations
  96. GRB 050306: CORRECTION to date of observation
  97. GRB 050306: R-band observations
  98. GRB 050306: No Swift UVOT Optical Counterpart Detected
  99. GRB 050306: REM optical-infrared observations
  100. GRB 050306: Possible X-ray Afterglow Position from the Swift

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