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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"

32764 results found.

  1. GRB 050408: Swift XRT Position
  2. GRB 050408: ROTSE-III Optical Limits
  3. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  4. GRB050401: Radio Detection
  5. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  6. GRB 050406: Magellan optical observations
  7. GRB 050406: early Swift XRT analysis results
  8. GRB 050406 BAT refined analysis
  9. GRB 050406: Early observations with Swift-UVOT
  10. GRB 050406: Swift XRT Position
  11. Konus-Wind observation of GRB 050401
  12. GRB050401: Radio observation at 610 MHz with GMRT
  13. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  14. GRB 050401: VLT spectroscopic redshift
  15. GRB 050401 Optical Observations
  16. GRB050401: Maidanak optical observation
  17. GRB 050401 BAT refined analysis
  18. GRB050401: TNG R-band observation
  19. GRB 050402A: IR Analysis
  20. GRB050402: XDSS counterpart
  21. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  22. GRB 050401: Optical afterglow confirmed
  23. Swift-BAT detection of GRB 050401
  24. Retraction of three Swift GRB triggers
  25. GRB050331: No Afterglow Detected
  26. Swift-BAT detection of GRB 050331b
  27. GRB 050331: Swift UVOT Source
  28. Swift-BAT detection of GRB 050331
  29. Swift Data Publicly Available Starting April 5, 2005
  30. GRB050319: radio observation
  31. Konus-Wind observation of GRB 050326
  32. GRB050326: optical limit
  33. GRB 050326: Early observations with Swift-UVOT
  34. GRB 050326 XMM-Newton observation
  35. GRB 050326 : Planned XMM-Newton observation
  36. GRB 050326: Swift XRT Position
  37. GRB050326: optical limit 33min before GRB
  38. GRB 050326 BAT refined analysis
  39. GRB050326: delayed XRT observation
  40. Swift-BAT detection of a bright GRB 050326
  41. GRB050319, optical observations
  42. GRB050319, color indices
  43. GRB050319: optical observation, March 20-22
  44. GRB050319: RTT150 Optical Observations
  45. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  46. GRB 050319: ROTSE-III Refined Analysis
  47. GRB 050318: Swift-BAT refined analysis
  48. GRB050319: VLA Observations
  49. GRB050319: radio observation
  50. GRB 050319 R band observations
  51. GRB 050319: Swift-UVOT detection of the afterglow
  52. GRB 050315: Variability Analysis of Swift BAT Time History
  53. GRB050319: Radio Observations
  54. GRB 050319: NIR afterglow candidate
  55. GRB 050319:Near IR afterglow
  56. GRB050319: BR optical photometry
  57. GRB 050318: SWIFT-UVOT refined analysis
  58. GRB 050318: Absorption redshift from Magellan
  59. GRB 050319: Optical observation
  60. GRB 050319: Swift-BAT refined analysis
  61. GRB050319,optical observation
  62. GRB 050318: Swift/UVOT detection of afterglow emission
  63. GRB 050318: Magellan optical afterglow identification
  64. GRB050318: Swift XRT position
  65. RXTE Observations of GRB050318
  66. GRB 050315, SMARTS optical afterglow decay
  67. GRB050223: analysis of the XMM-Newton observation
  68. GRB050316: MASTER before, simultanious and follow up optical
  69. GRB 050306: ROTSE-III early limits
  70. GRB 050315: Swift-BAT further refined analysis
  71. GRB 050315, SMARTS optical/IR afterglow observations
  72. GRB 050315 I-band observations
  73. GRB050315: Radio afterglow
  74. GRB 050315: Absorption redshift
  75. GRB 050315: Optical afterglow identification
  76. GRB050315: Swift-BAT Refined analysis
  77. Non-detection of GRB050315 in ATCA Radio Observations
  78. GRB 050315: Swift XRT Position
  79. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  80. GRB 050315: Early Observations with Swift/UVOT
  81. GRB050223: No XMM-Newton OM detection of afterglow emission
  82. GRB 050306: Radio Observations
  83. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  84. GRB 050306: optical afterglow
  85. Swift-BAT trigger 107873: No Swift XRT counterpart
  86. GRB 050306: Confirmation of X-ray afterglow
  87. GRB 050309, Early optical limits from RAPTOR
  88. GRB050309: Early optical limit from P60
  89. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  90. GRB 050306: CORRECTION to date of observation
  91. GRB 050306: R-band observations
  92. GRB 050306: No Swift UVOT Optical Counterpart Detected
  93. GRB 050306: REM optical-infrared observations
  94. GRB 050306: Possible X-ray Afterglow Position from the Swift
  95. GRB 050306,optical observation
  96. GRB050215B: Late-Time Swift UVOT Observations
  97. PROMPT VRcIc Observations of GRB 050223
  98. XRF/GRB 050215B: Radio Observations
  99. GRB 050219b: candidate NIR afterglow
  100. GRB 050223: optical observations

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