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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"

26319 results found.

  1. GRB 050408: Kuiper 1.5m observations
  2. GRB 050412: early Swift XRT analysis results
  3. GRB 050412: Early Optical/Ultraviolet Observations with
  4. GRB 050408: SDSS Field Calibration
  5. GRB050412: P60 Observations
  6. GRB 050412: Swift XRT Position
  7. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  8. GRB 050412: IR and Optical observations
  9. GRB 050412: IR Observations
  10. GRB050408: Radio Observations
  11. GRB 050401: Optical limit
  12. GRB050410: P60 Observations
  13. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  14. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  15. GRB050410: Radio Observations
  16. GRB050410: MASTER optical observations
  17. GRB 050410: Early observations with Swift-UVOT
  18. Swift-BAT detection of GRB 050410
  19. GRB 050408: Inconsistency of host galaxy identification
  20. GRB 050408: Subaru Observations
  21. GRB 050408: WIDGET simultaneous optical observations
  22. GRB 050408: Properties of the Host Galaxy
  23. GRB050408: Radio Observations
  24. GRB 050408: Swift XRT analysis
  25. GRB 050408: Optical limit at 20 min after the burst
  26. GRB050408: REM NIR and Optical observation
  27. GRB 050408,optical observation
  28. GRB 050408: Mercator Optical Observations
  29. GRB 050408: Optical afterglow confirmed
  30. GRB 050408: opitcal observation
  31. GRB 050408, optical observations
  32. GRB 050408 optical candidate
  33. GRB 050408: Swift XRT Position
  34. GRB050408: MASTER optical observations
  35. GRB050401: Radio Detection
  36. GRB 050406: early Swift XRT analysis results
  37. GRB 050406 BAT refined analysis
  38. GRB 050406: Early observations with Swift-UVOT
  39. Swift-BAT detection of GRB 050406
  40. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  41. GRB 050401: VLT spectroscopic redshift
  42. GRB 050401 BAT refined analysis
  43. GRB050401: TNG R-band observation
  44. GRB 050402: Early observations with Swift-UVOT
  45. Swift Trigger 113225: P60 Observations
  46. GRB 050401: Optical afterglow confirmed
  47. GRB 050401: Prompt XRT position
  48. Retraction of three Swift GRB triggers
  49. GRB050331: No Afterglow Detected
  50. Swift-BAT detection of GRB 050331b
  51. GRB 050331: Swift UVOT Source
  52. Swift-BAT detection of GRB 050331
  53. GRB 050326: Early observations with Swift-UVOT
  54. GRB 050326 XMM-Newton observation
  55. GRB 050326: Swift XRT Position
  56. GRB 050326 BAT refined analysis
  57. GRB050326: delayed XRT observation
  58. GRB050319, color indices
  59. GRB050319: optical observation, March 20-22
  60. GRB050319: RTT150 Optical Observations
  61. Swift-BAT trigger 112060 is not a real GRB
  62. GRB 050318: Swift-BAT refined analysis
  63. GRB050319: VLA Observations
  64. GRB050319: radio observation
  65. GRB 050319: Swift-UVOT detection of the afterglow
  66. GRB 050315: Variability Analysis of Swift BAT Time History
  67. GRB050319: Radio Observations
  68. GRB 050319: NIR afterglow candidate
  69. GRB 050319:Near IR afterglow
  70. GRB 050318: SWIFT-UVOT refined analysis
  71. GRB 050319 : Confirmation of optical afterglow decay
  72. GRB 050319: Swift-BAT refined analysis
  73. GRB050319,optical observation
  74. GRB 050318: Swift/UVOT detection of afterglow emission
  75. RXTE Observations of GRB050318
  76. GRB050223: analysis of the XMM-Newton observation
  77. GRB050316: MASTER before, simultanious and follow up optical
  78. GRB 050306: ROTSE-III early limits
  79. GRB050316: MASTER optical observations
  80. GRB 050315: Swift-BAT further refined analysis
  81. GRB 050315 I-band observations
  82. GRB050315: Radio afterglow
  83. GRB050315: Swift-BAT Refined analysis
  84. Non-detection of GRB050315 in ATCA Radio Observations
  85. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  86. GRB 050315: Early Observations with Swift/UVOT
  87. GRB 050306: Radio Observations
  88. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  89. GRB 050306: optical afterglow
  90. Swift-BAT trigger 107873: No Swift XRT counterpart
  91. GRB 050306: Confirmation of X-ray afterglow
  92. GRB 050306: further TAROT optical data
  93. GRB050309: Early optical limit from P60
  94. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  95. GRB 050309 : Lulin R-band observation
  96. Swift 107873: P60 Optical Observations
  97. GRB 050306: R-band observations
  98. GRB 050306: REM optical-infrared observations
  99. GRB 050306: Possible X-ray Afterglow Position from the Swift
  100. GRB 050306: TAROT optical observations

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