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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"

32687 results found.

  1. GRB 050408: Subaru Observations
  2. GRB 050408: WIDGET simultaneous optical observations
  3. GRB 050408: SOAR UBVRc Observations
  4. GRB 050408: Properties of the Host Galaxy
  5. GRB 050408: Mercator Optical Observations
  6. GRB050408: Radio Observations
  7. GRB 050408: Swift XRT analysis
  8. GRB 050408, SMARTS optical/IR afterglow observations
  9. GRB 050408: Optical limit at 20 min after the burst
  10. GRB 050408, optical observations
  11. GRB050408: REM NIR and Optical observation
  12. GRB 050408: Moderate-resolution Gemini Spectroscopy
  13. GRB 050408,optical observation
  14. GRB 050408 Optical Observations
  15. GRB 050408: Emission and absorption redshift
  16. GRB 050408: Mercator Optical Observations
  17. GRB 050408: Magellan astrometry and photometry
  18. GRB 050408: First Optical observations with TFOSC at the RTT150
  19. GRB 050408: steepening of the optical decay
  20. GRB 050408: Optical afterglow confirmed
  21. GRB 050408: opitcal observation
  22. GRB 050408, optical observations
  23. GRB 050408 optical candidate
  24. GRB 050408: Swift XRT Position
  25. GRB 050408: ROTSE-III Optical Limits
  26. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  27. GRB050401: Radio Detection
  28. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  29. GRB 050406: Magellan optical observations
  30. GRB 050406: early Swift XRT analysis results
  31. GRB 050406 BAT refined analysis
  32. GRB 050406: Early observations with Swift-UVOT
  33. GRB 050406: Swift XRT Position
  34. Konus-Wind observation of GRB 050401
  35. GRB050401: Radio observation at 610 MHz with GMRT
  36. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  37. GRB 050401: VLT spectroscopic redshift
  38. GRB 050401 Optical Observations
  39. GRB050401: Maidanak optical observation
  40. GRB 050401 BAT refined analysis
  41. GRB050401: TNG R-band observation
  42. GRB 050402A: IR Analysis
  43. GRB050402: XDSS counterpart
  44. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  45. GRB 050401: Optical afterglow confirmed
  46. Swift-BAT detection of GRB 050401
  47. Retraction of three Swift GRB triggers
  48. GRB050331: No Afterglow Detected
  49. Swift-BAT detection of GRB 050331b
  50. GRB 050331: Swift UVOT Source
  51. Swift-BAT detection of GRB 050331
  52. Swift Data Publicly Available Starting April 5, 2005
  53. GRB050319: radio observation
  54. Konus-Wind observation of GRB 050326
  55. GRB050326: optical limit
  56. GRB 050326: Early observations with Swift-UVOT
  57. GRB 050326 XMM-Newton observation
  58. GRB 050326 : Planned XMM-Newton observation
  59. GRB 050326: Swift XRT Position
  60. GRB050326: optical limit 33min before GRB
  61. GRB 050326 BAT refined analysis
  62. GRB050326: delayed XRT observation
  63. Swift-BAT detection of a bright GRB 050326
  64. GRB050319, optical observations
  65. GRB050319, color indices
  66. GRB050319: optical observation, March 20-22
  67. GRB050319: RTT150 Optical Observations
  68. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  69. GRB 050319: ROTSE-III Refined Analysis
  70. GRB 050318: Swift-BAT refined analysis
  71. GRB050319: VLA Observations
  72. GRB050319: radio observation
  73. GRB 050319 R band observations
  74. GRB 050319: Swift-UVOT detection of the afterglow
  75. GRB 050315: Variability Analysis of Swift BAT Time History
  76. GRB050319: Radio Observations
  77. GRB 050319: NIR afterglow candidate
  78. GRB 050319:Near IR afterglow
  79. GRB050319: BR optical photometry
  80. GRB 050318: SWIFT-UVOT refined analysis
  81. GRB 050318: Absorption redshift from Magellan
  82. GRB 050319: Optical observation
  83. GRB 050319: Swift-BAT refined analysis
  84. GRB050319,optical observation
  85. GRB 050318: Swift/UVOT detection of afterglow emission
  86. GRB 050318: Magellan optical afterglow identification
  87. GRB050318: Swift XRT position
  88. RXTE Observations of GRB050318
  89. GRB 050315, SMARTS optical afterglow decay
  90. GRB050223: analysis of the XMM-Newton observation
  91. GRB050316: MASTER before, simultanious and follow up optical
  92. GRB 050306: ROTSE-III early limits
  93. GRB 050315: Swift-BAT further refined analysis
  94. GRB 050315, SMARTS optical/IR afterglow observations
  95. GRB 050315 I-band observations
  96. GRB050315: Radio afterglow
  97. GRB 050315: Absorption redshift
  98. GRB 050315: Optical afterglow identification
  99. GRB050315: Swift-BAT Refined analysis
  100. Non-detection of GRB050315 in ATCA Radio Observations

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