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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32559 results found.

  1. GRB 050406: Magellan optical observations
  2. GRB 050406: early Swift XRT analysis results
  3. GRB 050406 BAT refined analysis
  4. GRB 050406: Early observations with Swift-UVOT
  5. GRB 050406: Swift XRT Position
  6. Konus-Wind observation of GRB 050401
  7. GRB050401: Radio observation at 610 MHz with GMRT
  8. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  9. GRB 050401: VLT spectroscopic redshift
  10. GRB 050401 Optical Observations
  11. GRB050401: Maidanak optical observation
  12. GRB 050401 BAT refined analysis
  13. GRB050401: TNG R-band observation
  14. GRB 050402A: IR Analysis
  15. GRB050402: XDSS counterpart
  16. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  17. GRB 050401: Optical afterglow confirmed
  18. Swift-BAT detection of GRB 050401
  19. Retraction of three Swift GRB triggers
  20. GRB050331: No Afterglow Detected
  21. Swift-BAT detection of GRB 050331b
  22. GRB 050331: Swift UVOT Source
  23. Swift-BAT detection of GRB 050331
  24. Swift Data Publicly Available Starting April 5, 2005
  25. GRB050319: radio observation
  26. Konus-Wind observation of GRB 050326
  27. GRB050326: optical limit
  28. GRB 050326: Early observations with Swift-UVOT
  29. GRB 050326 XMM-Newton observation
  30. GRB 050326 : Planned XMM-Newton observation
  31. GRB 050326: Swift XRT Position
  32. GRB050326: optical limit 33min before GRB
  33. GRB 050326 BAT refined analysis
  34. GRB050326: delayed XRT observation
  35. Swift-BAT detection of a bright GRB 050326
  36. GRB050319, optical observations
  37. GRB050319, color indices
  38. GRB050319: optical observation, March 20-22
  39. GRB050319: RTT150 Optical Observations
  40. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  41. GRB 050319: ROTSE-III Refined Analysis
  42. GRB 050318: Swift-BAT refined analysis
  43. GRB050319: VLA Observations
  44. GRB050319: radio observation
  45. GRB 050319 R band observations
  46. GRB 050319: Swift-UVOT detection of the afterglow
  47. GRB 050315: Variability Analysis of Swift BAT Time History
  48. GRB050319: Radio Observations
  49. GRB 050319: NIR afterglow candidate
  50. GRB 050319:Near IR afterglow
  51. GRB050319: BR optical photometry
  52. GRB 050318: SWIFT-UVOT refined analysis
  53. GRB 050318: Absorption redshift from Magellan
  54. GRB 050319: Optical observation
  55. GRB 050319: Swift-BAT refined analysis
  56. GRB050319,optical observation
  57. GRB 050318: Swift/UVOT detection of afterglow emission
  58. GRB 050318: Magellan optical afterglow identification
  59. GRB050318: Swift XRT position
  60. RXTE Observations of GRB050318
  61. GRB 050315, SMARTS optical afterglow decay
  62. GRB050223: analysis of the XMM-Newton observation
  63. GRB050316: MASTER before, simultanious and follow up optical
  64. GRB 050306: ROTSE-III early limits
  65. GRB 050315: Swift-BAT further refined analysis
  66. GRB 050315, SMARTS optical/IR afterglow observations
  67. GRB 050315 I-band observations
  68. GRB050315: Radio afterglow
  69. GRB 050315: Absorption redshift
  70. GRB 050315: Optical afterglow identification
  71. GRB050315: Swift-BAT Refined analysis
  72. Non-detection of GRB050315 in ATCA Radio Observations
  73. GRB 050315: Swift XRT Position
  74. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  75. GRB 050315: Early Observations with Swift/UVOT
  76. GRB050223: No XMM-Newton OM detection of afterglow emission
  77. GRB 050306: Radio Observations
  78. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  79. GRB 050306: optical afterglow
  80. Swift-BAT trigger 107873: No Swift XRT counterpart
  81. GRB 050306: Confirmation of X-ray afterglow
  82. GRB 050309, Early optical limits from RAPTOR
  83. GRB050309: Early optical limit from P60
  84. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  85. GRB 050306: CORRECTION to date of observation
  86. GRB 050306: R-band observations
  87. GRB 050306: No Swift UVOT Optical Counterpart Detected
  88. GRB 050306: REM optical-infrared observations
  89. GRB 050306: Possible X-ray Afterglow Position from the Swift
  90. GRB 050306,optical observation
  91. GRB050215B: Late-Time Swift UVOT Observations
  92. PROMPT VRcIc Observations of GRB 050223
  93. XRF/GRB 050215B: Radio Observations
  94. GRB 050219b: candidate NIR afterglow
  95. GRB 050223: optical observations
  96. GRB050223 XMM-Newton observation
  97. INTEGRAL detection of GRB 050223
  98. GRB050223: No Swift UVOT Detection of Afterglow Emission
  99. GRB050223: ROTSE-III Optical Observations
  100. GRB050219b: CORRECTION to time of UVOT observations

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