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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"

26328 results found.

  1. GRB050416B: IR observations
  2. GRB050412: Radio Observations
  3. GRB 050416: Swift/UVOT detection of afterglow emission
  4. GRB050416: Refined Swift-XRT analysis
  5. GRB 050416,optical observation
  6. GRB050416: P200 NIR Observations
  7. GRB 050416: Radio observations
  8. Swift BAT/XRT Detection of GRB 050416
  9. GRB 050412: PROMPT VRcIc Observations
  10. GRB 050408: Kuiper 1.5m observations
  11. GRB 050412: early Swift XRT analysis results
  12. GRB 050412: Early Optical/Ultraviolet Observations with
  13. GRB 050408: SDSS Field Calibration
  14. GRB050412: P60 Observations
  15. GRB 050412: Swift XRT Position
  16. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  17. GRB 050412: IR and Optical observations
  18. GRB 050412: IR Observations
  19. GRB050408: Radio Observations
  20. GRB 050401: Optical limit
  21. GRB050410: P60 Observations
  22. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  23. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  24. GRB050410: Radio Observations
  25. GRB050410: MASTER optical observations
  26. GRB 050410: Early observations with Swift-UVOT
  27. Swift-BAT detection of GRB 050410
  28. GRB 050408: Inconsistency of host galaxy identification
  29. GRB 050408: Subaru Observations
  30. GRB 050408: WIDGET simultaneous optical observations
  31. GRB 050408: Properties of the Host Galaxy
  32. GRB050408: Radio Observations
  33. GRB 050408: Swift XRT analysis
  34. GRB 050408: Optical limit at 20 min after the burst
  35. GRB050408: REM NIR and Optical observation
  36. GRB 050408,optical observation
  37. GRB 050408: Mercator Optical Observations
  38. GRB 050408: Optical afterglow confirmed
  39. GRB 050408: opitcal observation
  40. GRB 050408, optical observations
  41. GRB 050408 optical candidate
  42. GRB 050408: Swift XRT Position
  43. GRB050408: MASTER optical observations
  44. GRB050401: Radio Detection
  45. GRB 050406: early Swift XRT analysis results
  46. GRB 050406 BAT refined analysis
  47. GRB 050406: Early observations with Swift-UVOT
  48. Swift-BAT detection of GRB 050406
  49. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  50. GRB 050401: VLT spectroscopic redshift
  51. GRB 050401 BAT refined analysis
  52. GRB050401: TNG R-band observation
  53. GRB 050402: Early observations with Swift-UVOT
  54. Swift Trigger 113225: P60 Observations
  55. GRB 050401: Optical afterglow confirmed
  56. GRB 050401: Prompt XRT position
  57. Retraction of three Swift GRB triggers
  58. GRB050331: No Afterglow Detected
  59. Swift-BAT detection of GRB 050331b
  60. GRB 050331: Swift UVOT Source
  61. Swift-BAT detection of GRB 050331
  62. GRB 050326: Early observations with Swift-UVOT
  63. GRB 050326 XMM-Newton observation
  64. GRB 050326: Swift XRT Position
  65. GRB 050326 BAT refined analysis
  66. GRB050326: delayed XRT observation
  67. GRB050319, color indices
  68. GRB050319: optical observation, March 20-22
  69. GRB050319: RTT150 Optical Observations
  70. Swift-BAT trigger 112060 is not a real GRB
  71. GRB 050318: Swift-BAT refined analysis
  72. GRB050319: VLA Observations
  73. GRB050319: radio observation
  74. GRB 050319: Swift-UVOT detection of the afterglow
  75. GRB 050315: Variability Analysis of Swift BAT Time History
  76. GRB050319: Radio Observations
  77. GRB 050319: NIR afterglow candidate
  78. GRB 050319:Near IR afterglow
  79. GRB 050318: SWIFT-UVOT refined analysis
  80. GRB 050319 : Confirmation of optical afterglow decay
  81. GRB 050319: Swift-BAT refined analysis
  82. GRB050319,optical observation
  83. GRB 050318: Swift/UVOT detection of afterglow emission
  84. RXTE Observations of GRB050318
  85. GRB050223: analysis of the XMM-Newton observation
  86. GRB050316: MASTER before, simultanious and follow up optical
  87. GRB 050306: ROTSE-III early limits
  88. GRB050316: MASTER optical observations
  89. GRB 050315: Swift-BAT further refined analysis
  90. GRB 050315 I-band observations
  91. GRB050315: Radio afterglow
  92. GRB050315: Swift-BAT Refined analysis
  93. Non-detection of GRB050315 in ATCA Radio Observations
  94. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  95. GRB 050315: Early Observations with Swift/UVOT
  96. GRB 050306: Radio Observations
  97. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  98. GRB 050306: optical afterglow
  99. Swift-BAT trigger 107873: No Swift XRT counterpart
  100. GRB 050306: Confirmation of X-ray afterglow

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