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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"

32711 results found.

  1. GRB 050412: retraction of UVOT transient report
  2. GRB 050412: Optical limit
  3. GRB 050412: LCO Optical Observations
  4. GRB 050412: Optical observations
  5. GRB050412: P60 Observations
  6. GRB 050412: Swift XRT Position
  7. GRB050412: optical limit before and during GRB
  8. GRB 050412: LCO optical observations
  9. GRB050412: ROTSE-III Optical Limits
  10. GRB050408: Radio Observations
  11. GRB 050401: Optical limit
  12. GRB 050408: Optical limit
  13. GRB050410: P60 Observations
  14. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  15. GRB 050410, optical observations
  16. GRB 050408: PROMPT VRcIc Observations
  17. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  18. GRB050410 : Null detection report
  19. GRB 050410, optical observations
  20. GRB050410: Radio Observations
  21. GRB 050410: Early observations with Swift-UVOT
  22. Swift-BAT detection of GRB 050410
  23. GRB 050408: Retraction of Proposed Host Galaxy
  24. GRB 050408: Inconsistency of host galaxy identification
  25. GRB 050408: Subaru Observations
  26. GRB 050408: WIDGET simultaneous optical observations
  27. GRB 050408: SOAR UBVRc Observations
  28. GRB 050408: Properties of the Host Galaxy
  29. GRB 050408: Mercator Optical Observations
  30. GRB050408: Radio Observations
  31. GRB 050408: Swift XRT analysis
  32. GRB 050408, SMARTS optical/IR afterglow observations
  33. GRB 050408: Optical limit at 20 min after the burst
  34. GRB 050408, optical observations
  35. GRB050408: REM NIR and Optical observation
  36. GRB 050408: Moderate-resolution Gemini Spectroscopy
  37. GRB 050408,optical observation
  38. GRB 050408 Optical Observations
  39. GRB 050408: Emission and absorption redshift
  40. GRB 050408: Mercator Optical Observations
  41. GRB 050408: Magellan astrometry and photometry
  42. GRB 050408: First Optical observations with TFOSC at the RTT150
  43. GRB 050408: steepening of the optical decay
  44. GRB 050408: Optical afterglow confirmed
  45. GRB 050408: opitcal observation
  46. GRB 050408, optical observations
  47. GRB 050408 optical candidate
  48. GRB 050408: Swift XRT Position
  49. GRB 050408: ROTSE-III Optical Limits
  50. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  51. GRB050401: Radio Detection
  52. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  53. GRB 050406: Magellan optical observations
  54. GRB 050406: early Swift XRT analysis results
  55. GRB 050406 BAT refined analysis
  56. GRB 050406: Early observations with Swift-UVOT
  57. GRB 050406: Swift XRT Position
  58. Konus-Wind observation of GRB 050401
  59. GRB050401: Radio observation at 610 MHz with GMRT
  60. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  61. GRB 050401: VLT spectroscopic redshift
  62. GRB 050401 Optical Observations
  63. GRB050401: Maidanak optical observation
  64. GRB 050401 BAT refined analysis
  65. GRB050401: TNG R-band observation
  66. GRB 050402A: IR Analysis
  67. GRB050402: XDSS counterpart
  68. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  69. GRB 050401: Optical afterglow confirmed
  70. Swift-BAT detection of GRB 050401
  71. Retraction of three Swift GRB triggers
  72. GRB050331: No Afterglow Detected
  73. Swift-BAT detection of GRB 050331b
  74. GRB 050331: Swift UVOT Source
  75. Swift-BAT detection of GRB 050331
  76. Swift Data Publicly Available Starting April 5, 2005
  77. GRB050319: radio observation
  78. Konus-Wind observation of GRB 050326
  79. GRB050326: optical limit
  80. GRB 050326: Early observations with Swift-UVOT
  81. GRB 050326 XMM-Newton observation
  82. GRB 050326 : Planned XMM-Newton observation
  83. GRB 050326: Swift XRT Position
  84. GRB050326: optical limit 33min before GRB
  85. GRB 050326 BAT refined analysis
  86. GRB050326: delayed XRT observation
  87. Swift-BAT detection of a bright GRB 050326
  88. GRB050319, optical observations
  89. GRB050319, color indices
  90. GRB050319: optical observation, March 20-22
  91. GRB050319: RTT150 Optical Observations
  92. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  93. GRB 050319: ROTSE-III Refined Analysis
  94. GRB 050318: Swift-BAT refined analysis
  95. GRB050319: VLA Observations
  96. GRB050319: radio observation
  97. GRB 050319 R band observations
  98. GRB 050319: Swift-UVOT detection of the afterglow
  99. GRB 050315: Variability Analysis of Swift BAT Time History
  100. GRB050319: Radio Observations

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