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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"

21861 results found.

  1. GRB 050408: RTT150 optical observations
  2. GRB 050412: PROMPT VRcIc Observations
  3. GRB 050408: Kuiper 1.5m observations
  4. GRB 050412: optical observations
  5. GRB 050408: refined XRT analysis, no jet break seen yet
  6. GRB 050412: ANU 2.3m observations
  7. GRB 050412: Early Optical/Ultraviolet Observations with
  8. GRB 050408: SDSS Field Calibration
  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: Retraction of Proposed Host Galaxy
  28. GRB 050408: Inconsistency of host galaxy identification
  29. GRB 050408: Subaru Observations
  30. GRB 050408: WIDGET simultaneous optical observations
  31. GRB 050408: SOAR UBVRc Observations
  32. GRB 050408: Properties of the Host Galaxy
  33. GRB 050408: Mercator Optical Observations
  34. GRB050408: Radio Observations
  35. GRB 050408, SMARTS optical/IR afterglow observations
  36. GRB 050408, optical observations
  37. GRB 050408: Moderate-resolution Gemini Spectroscopy
  38. GRB 050408 Optical Observations
  39. GRB 050408: Mercator Optical Observations
  40. GRB 050408: First Optical observations with TFOSC at the RTT150
  41. GRB 050408, optical observations
  42. GRB 050408 optical candidate
  43. GRB050408: MASTER optical observations
  44. GRB050401: Radio Detection
  45. GRB 050406: Magellan optical observations
  46. GRB 050406: Early observations with Swift-UVOT
  47. GRB050401: Radio observation at 610 MHz with GMRT
  48. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  49. GRB 050401 Optical Observations
  50. GRB050401: TNG R-band observation
  51. GRB 050402A: IR Observations
  52. GRB 050402: Early observations with Swift-UVOT
  53. Swift Trigger 113225: P60 Observations
  54. GRB 050401: Optical afterglow confirmed
  55. GRB 050401: Optical afterglow candidate
  56. GRB050331: No Afterglow Detected
  57. GRB 050331: Swift UVOT Source
  58. GRB050319: radio observation
  59. GRB 050326: Early observations with Swift-UVOT
  60. GRB 050326: Swift XRT Position
  61. GRB050326: delayed XRT observation
  62. GRB050319, optical observations
  63. GRB050319, color indices
  64. GRB050319: optical observation, March 20-22
  65. GRB050319: RTT150 Optical Observations
  66. GRB 050319: ROTSE-III Refined Analysis
  67. GRB050319: VLA Observations
  68. GRB 050319 R band observations
  69. GRB 050319: Swift-UVOT detection of the afterglow
  70. GRB050319: Radio Observations
  71. GRB 050319: NIR afterglow candidate
  72. GRB 050319:Near IR afterglow
  73. GRB 050319 : Confirmation of optical afterglow decay
  74. GRB 050319: Detection of Possible Optical Counterpart
  75. GRB 050318: Swift/UVOT detection of afterglow emission
  76. RXTE Observations of GRB050318
  77. GRB 050315, SMARTS optical afterglow decay
  78. GRB050316: MASTER before, simultanious and follow up optical
  79. GRB050316: MASTER optical observations
  80. GRB 050315, SMARTS optical/IR afterglow observations
  81. GRB 050315 I-band observations
  82. GRB050315: Radio afterglow
  83. Non-detection of GRB050315 in ATCA Radio Observations
  84. GRB 050315: Swift XRT Position
  85. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  86. GRB 050315: Early Observations with Swift/UVOT
  87. Swift-BAT detection of GRB 050315
  88. GRB050223: No XMM-Newton OM detection of afterglow emission
  89. GRB 050306: Radio Observations
  90. GRB 050306: optical afterglow
  91. GRB 050126: Redshift determination
  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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