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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"

26335 results found.

  1. GRB 050416b: Tentative Swift XRT Position
  2. GRB 050315: potential host galaxy
  3. GRB050326: analysis of the XMM-Newton observation
  4. GRB050418: Null Optical Observations
  5. GRB050416A, optical observations
  6. GRB 050418: Swift-BAT refined analysis
  7. GRB 050416: Mitsume optical observation
  8. GRB050416B: IR observations
  9. GRB050412: Radio Observations
  10. GRB 050416: Swift/UVOT detection of afterglow emission
  11. GRB050416: Refined Swift-XRT analysis
  12. GRB 050416,optical observation
  13. GRB050416: P200 NIR Observations
  14. GRB 050416: Radio observations
  15. Swift BAT/XRT Detection of GRB 050416
  16. GRB 050412: PROMPT VRcIc Observations
  17. GRB 050408: Kuiper 1.5m observations
  18. GRB 050412: early Swift XRT analysis results
  19. GRB 050412: Early Optical/Ultraviolet Observations with
  20. GRB 050408: SDSS Field Calibration
  21. GRB050412: P60 Observations
  22. GRB 050412: Swift XRT Position
  23. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  24. GRB 050412: IR and Optical observations
  25. GRB 050412: IR Observations
  26. GRB050408: Radio Observations
  27. GRB 050401: Optical limit
  28. GRB050410: P60 Observations
  29. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  30. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  31. GRB050410: Radio Observations
  32. GRB050410: MASTER optical observations
  33. GRB 050410: Early observations with Swift-UVOT
  34. Swift-BAT detection of GRB 050410
  35. GRB 050408: Inconsistency of host galaxy identification
  36. GRB 050408: Subaru Observations
  37. GRB 050408: WIDGET simultaneous optical observations
  38. GRB 050408: Properties of the Host Galaxy
  39. GRB050408: Radio Observations
  40. GRB 050408: Swift XRT analysis
  41. GRB 050408: Optical limit at 20 min after the burst
  42. GRB050408: REM NIR and Optical observation
  43. GRB 050408,optical observation
  44. GRB 050408: Mercator Optical Observations
  45. GRB 050408: Optical afterglow confirmed
  46. GRB 050408: opitcal observation
  47. GRB 050408, optical observations
  48. GRB 050408 optical candidate
  49. GRB 050408: Swift XRT Position
  50. GRB050408: MASTER optical observations
  51. GRB050401: Radio Detection
  52. GRB 050406: early Swift XRT analysis results
  53. GRB 050406 BAT refined analysis
  54. GRB 050406: Early observations with Swift-UVOT
  55. Swift-BAT detection of GRB 050406
  56. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  57. GRB 050401: VLT spectroscopic redshift
  58. GRB 050401 BAT refined analysis
  59. GRB050401: TNG R-band observation
  60. GRB 050402: Early observations with Swift-UVOT
  61. Swift Trigger 113225: P60 Observations
  62. GRB 050401: Optical afterglow confirmed
  63. GRB 050401: Prompt XRT position
  64. Retraction of three Swift GRB triggers
  65. GRB050331: No Afterglow Detected
  66. Swift-BAT detection of GRB 050331b
  67. GRB 050331: Swift UVOT Source
  68. Swift-BAT detection of GRB 050331
  69. GRB 050326: Early observations with Swift-UVOT
  70. GRB 050326 XMM-Newton observation
  71. GRB 050326: Swift XRT Position
  72. GRB 050326 BAT refined analysis
  73. GRB050326: delayed XRT observation
  74. GRB050319, color indices
  75. GRB050319: optical observation, March 20-22
  76. GRB050319: RTT150 Optical Observations
  77. Swift-BAT trigger 112060 is not a real GRB
  78. GRB 050318: Swift-BAT refined analysis
  79. GRB050319: VLA Observations
  80. GRB050319: radio observation
  81. GRB 050319: Swift-UVOT detection of the afterglow
  82. GRB 050315: Variability Analysis of Swift BAT Time History
  83. GRB050319: Radio Observations
  84. GRB 050319: NIR afterglow candidate
  85. GRB 050319:Near IR afterglow
  86. GRB 050318: SWIFT-UVOT refined analysis
  87. GRB 050319 : Confirmation of optical afterglow decay
  88. GRB 050319: Swift-BAT refined analysis
  89. GRB050319,optical observation
  90. GRB 050318: Swift/UVOT detection of afterglow emission
  91. RXTE Observations of GRB050318
  92. GRB050223: analysis of the XMM-Newton observation
  93. GRB050316: MASTER before, simultanious and follow up optical
  94. GRB 050306: ROTSE-III early limits
  95. GRB050316: MASTER optical observations
  96. GRB 050315: Swift-BAT further refined analysis
  97. GRB 050315 I-band observations
  98. GRB050315: Radio afterglow
  99. GRB050315: Swift-BAT Refined analysis
  100. Non-detection of GRB050315 in ATCA Radio Observations

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