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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"

23417 results found.

  1. GRB050410: P60 Observations
  2. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  3. GRB 050410, optical observations
  4. GRB 050408: PROMPT VRcIc Observations
  5. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  6. GRB050410: Radio Observations
  7. GRB050410: MASTER optical observations
  8. GRB 050410: Early observations with Swift-UVOT
  9. GRB 050408: Inconsistency of host galaxy identification
  10. GRB 050408: Subaru Observations
  11. GRB 050408: WIDGET simultaneous optical observations
  12. GRB 050408: Properties of the Host Galaxy
  13. GRB050408: Radio Observations
  14. GRB 050408, optical observations
  15. GRB050408: REM NIR and Optical observation
  16. GRB 050408,optical observation
  17. GRB 050408: Emission and absorption redshift
  18. GRB 050408: Mercator Optical Observations
  19. GRB 050408: Optical afterglow confirmed
  20. GRB 050408: opitcal observation
  21. GRB 050408, optical observations
  22. GRB 050408: Swift XRT Position
  23. GRB 050408: ROTSE-III Optical Limits
  24. GRB050408: MASTER optical observations
  25. GRB050401: Radio Detection
  26. GRB 050406: Magellan optical observations
  27. GRB 050406 BAT refined analysis
  28. GRB 050406: Early observations with Swift-UVOT
  29. Swift-BAT detection of GRB 050406
  30. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  31. GRB 050401 BAT refined analysis
  32. GRB050401: TNG R-band observation
  33. GRB 050402: Early observations with Swift-UVOT
  34. Swift Trigger 113225: P60 Observations
  35. GRB 050401: Optical afterglow confirmed
  36. GRB050331: No Afterglow Detected
  37. GRB 050331: Swift UVOT Source
  38. Konus-Wind observation of GRB 050326
  39. GRB 050326: Early observations with Swift-UVOT
  40. GRB 050326 XMM-Newton observation
  41. GRB 050326: Swift XRT Position
  42. GRB050326: optical limit 33min before GRB
  43. GRB 050326 BAT refined analysis
  44. GRB050326: delayed XRT observation
  45. GRB050319, optical observations
  46. GRB050319: optical observation, March 20-22
  47. GRB050319: RTT150 Optical Observations
  48. GRB050319: VLA Observations
  49. GRB050319: radio observation
  50. GRB 050319: Swift-UVOT detection of the afterglow
  51. GRB050319: Radio Observations
  52. GRB 050319: NIR afterglow candidate
  53. GRB 050319:Near IR afterglow
  54. GRB 050318: SWIFT-UVOT refined analysis
  55. GRB050319,optical observation
  56. GRB 050318: Swift/UVOT detection of afterglow emission
  57. RXTE Observations of GRB050318
  58. Swift-BAT detection of GRB 050318
  59. GRB050223: analysis of the XMM-Newton observation
  60. GRB050316: MASTER before, simultanious and follow up optical
  61. GRB 050306: ROTSE-III early limits
  62. GRB050316: MASTER optical observations
  63. GRB 050315 I-band observations
  64. GRB050315: Radio afterglow
  65. Non-detection of GRB050315 in ATCA Radio Observations
  66. GRB 050315: Early Observations with Swift/UVOT
  67. Swift-BAT detection of GRB 050315
  68. GRB 050306: Radio Observations
  69. GRB 050306: optical afterglow
  70. Swift-BAT trigger 107873: No Swift XRT counterpart
  71. GRB 050306: Confirmation of X-ray afterglow
  72. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  73. GRB 050309 : Lulin R-band observation
  74. Swift 107873: P60 Optical Observations
  75. GRB 050306: R-band observations
  76. GRB 050306: REM optical-infrared observations
  77. GRB 050306: Possible X-ray Afterglow Position from the Swift
  78. GRB 050306: TAROT optical observations
  79. GRB 050306,optical observation
  80. GRB 050306: Swift-BAT detection of a long burst
  81. Ongoing activity of SGR 1806-20 after the giant flare
  82. GRB050215B: Late-Time Swift UVOT Observations
  83. PROMPT VRcIc Observations of GRB 050223
  84. XRF/GRB 050215B: Radio Observations
  85. XMM-Newton Images of GRB 050223
  86. GRB 050219b: candidate NIR afterglow
  87. GRB050223 XMM-Newton observation
  88. INTEGRAL detection of GRB 050223
  89. GRB050223: ROTSE-III Optical Observations
  90. GRB 050223: Swift XRT Position
  91. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  92. GRB050219b: CORRECTION to time of UVOT observations
  93. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  94. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  95. GRB 050219a: Optical observations from LCO
  96. GRB 050219b: Optical and near-IR observations from LCO
  97. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  98. GRB 050219b: Refined XRT position
  99. GRB 050219b: CORRECTION: Swift XRT Position
  100. GRB 050219b: Swift XRT Position

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