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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"

26327 results found.

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

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